pcb
Home > Blog

What Determines A Circuit’s Capacity? – Best Technology

11 9 月, 2024

What is the capacity of a circuit?

The capacity of a circuit, often referred to as PCB current-carrying capacity, is the maximum amount of electrical current it can handle without overheating or causing a fault. This capacity is crucial for ensuring that the circuit operates safely, powering all connected devices without causing damage. A circuit’s capacity is typically measured in amperes (amps), which shows the flow of electrical current. The capacity of a circuit is determined by its components, such as the wire size, the circuit breaker, and the connected devices.

What Determines A Circuit's Capacity?

Circuits need to be designed and maintained within their safe capacity. If you overload a circuit, it could lead to overheating, equipment failure, or even an electrical fire. The circuit breaker is the main defense against this, as it cuts off the current flow if the circuit exceeds its capacity.

How can an electrician predict a circuit’s capacity?

Electricians can predict a circuit’s capacity by analyzing the components of the electrical system. The wire gauge, breaker rating, and the types of devices connected to the circuit are all factors in this determination. The wire gauge (or thickness) is one of the most important factors—thicker wires can carry more current.

Another key element is the circuit breaker or fuse. These devices are rated for a specific current. For example, a typical household circuit breaker may be rated for 15 or 20 amps. Electricians calculate the expected load, considering how many devices are likely to run on that circuit at the same time.

To predict the capacity accurately, electricians follow safety codes and standards like the National Electrical Code (NEC). This ensures that the circuits can handle the loads without risks of overload.

What determines the size of a circuit?

The size of the circuit is mainly determined by the supply voltage and resistance. ‌

The size of the current is affected by a number of factors, of which the power supply voltage and resistance are the most direct and critical factors. The power supply voltage directly determines the driving force of the electron flow in the circuit, and the resistance is the obstacle of the electron flow, and the two work together to determine the size of the current in the circuit. To be specific:

‌Power supply voltage

The power supply voltage directly affects the size of the current. According to Ohm’s law, current is proportional to voltage. This means that the higher the voltage, the greater the current in the circuit.

What Determines A Circuit's Capacity?

‌Resistance size

The larger the resistance, the less current passes through the circuit. According to Ohm’s law, current is inversely proportional to resistance. This means that the greater the resistance, the smaller the current in the circuit.

In addition, the series-parallel relationship of the circuit and the temperature also affect the size of the current. In a series circuit, the total current is equal to the sum of the currents of each resistor; In a parallel circuit, the total current is also the sum of the individual resistance currents. A change in temperature will affect the value of the resistance and thus the magnitude of the current.

What is the making capacity of the circuit?

The making capacity of a circuit refers to the ability of a breaker or switch to handle the initial surge of current when it is first energized. This initial surge, often called inrush current, can be much higher than the normal operating current. The making capacity is crucial because it ensures that the breaker can handle this brief spike without tripping unnecessarily.

In industrial applications, the making capacity is even more important, as many machines and motors draw a high inrush current when starting up. The breaker must be able to manage this surge without interrupting the power flow. Typically, the making capacity is higher than the breaker’s rated current capacity to account for these surges.

What determines circuit capacity?

The factors that determine the capacity of a circuit mainly include the structure of the capacitor itself, environmental conditions, and application scenarios. The structure of the capacitor is a key factor in determining its capacity, specifically including:

  • Distance between the plates

The smaller the distance between the plates, the greater the capacitance. This is because reducing the distance increases the electric field strength, allowing the capacitor to store more charge.

  • Relative area of the plates

The larger the relative area of the plates, the greater the capacitance. A larger area makes the electric field more uniform, thus increasing the capacitor’s capacitance.

  • Dielectric constant of the insulating material

The higher the dielectric constant of the insulating material, the greater the capacitance of the capacitor. The dielectric constant reflects the material’s ability to influence the electric field, affecting the capacitor’s capacitance.

  • Material of the metal plates

The material of the metal plates also affects the capacitance. Factors such as the purity and conductivity of the metal can influence the capacity. Higher purity and better conductivity in the metal plates can increase the electric field strength, thus enhancing the capacitor’s capacitance.

Environmental conditions and application scenarios can also affect the circuit’s capacity, including:

  • Ambient temperature

Changes in ambient temperature can affect the resistivity of the metal plates and insulating material, which in turn affects the capacitance. An increase in temperature typically lowers resistivity, which may either increase or decrease capacitance, depending on how temperature influences resistivity.

  • Load resistance

In practical applications, when the capacitor works together with load resistance, the size of the load resistance affects the capacitor’s charging and discharging process, thereby influencing its capacitance. The size of the load resistance determines the speed at which the capacitor stores and releases charge, thus impacting the capacitor’s performance.

How do you calculate circuit load capacity?

To calculate circuit load capacity, electricians follow a few simple steps. First, they determine the total wattage of all the devices on the circuit. For example, a room may have several light bulbs, a television, and a computer, each with their own wattage rating.

Once they have the total wattage, they divide this by the voltage (typically 120V in homes). This gives them the total current in amps that the circuit is using. Electricians then compare this value to the circuit breaker’s rating. For safety, the total load should not exceed 80% of the breaker’s capacity. So, on a 20-amp circuit, the maximum continuous load would be 16 amps.

What Determines A Circuit's Capacity?

What is the maximum load on a 20-amp breaker?

A standard 20-amp breaker can handle up to 2,400 watts, based on a 120V system (20 amps x 120 volts = 2,400 watts). However, the NEC recommends only using 80% of the breaker’s capacity for continuous loads. That means a 20-amp breaker should typically handle no more than 1,920 watts (80% of 2,400 watts) for ongoing use.

This buffer is important because many appliances and devices draw more power when they first turn on, especially if they have motors or heating elements. By keeping the load below 80%, you avoid overloading the circuit.

In practical terms, a 20-amp breaker is commonly used for kitchen appliances like microwaves, toasters, or coffee makers. It’s also used in rooms where many devices might be connected, like living rooms or offices. By calculating the load and making sure it stays below the maximum, you can safely use your circuit without causing it to trip.

Tags: , ,
Posted in best pcb, bestpcb, FAQ | No Comments »

What is the body to body clearance for smt parts?

11 9 月, 2024

Surface Mount Technology (SMT) has revolutionized electronics manufacturing, allowing for compact, efficient, and high-speed production of printed circuit boards (PCBs).

But designing an effective PCB requires an understanding of critical clearance rules, especially when dealing with SMT components. Proper body-to-body clearance can influence reliability, manufacturability, and long-term performance.

What Is the Clearance Rule for PCB?

PCB design follows strict clearance rules to ensure that components work as expected. Clearance refers to the minimum space required between elements on the board to prevent interference, short circuits, or damage during soldering and operation.

What is the body to body clearance for smt parts？

The general clearance rules for PCBs depend on factors such as voltage, current, and operational environment. For standard PCBs, a common clearance rule is 0.1 mm to 0.2 mm between components, though this can vary based on specific needs. It’s essential to consult design guidelines from the PCB manufacturer, as they may provide specific instructions based on their capabilities.

How Close Can Components Be on a PCB?

Component spacing is one of the most crucial elements in PCB design. The minimum distance between SMT parts, or body-to-body clearance, is influenced by several factors, including component size, heat dissipation, and soldering methods.

For standard designs, a minimum body-to-body clearance of 0.2 mm to 0.5 mm is typical for most SMT components. This spacing ensures proper airflow, heat dissipation, and avoids accidental shorts during soldering. Smaller devices may require tighter clearances, but you should always account for potential manufacturing limitations and performance requirements.

Maintaining adequate clearance also helps with inspection and rework. If components are too close together, it becomes challenging to check for soldering defects or make repairs, increasing costs and time for revisions.

What Is the Spacing Between SMD Pads?

Surface Mount Devices (SMD) pads are small metal areas on the PCB where components are soldered. The pad spacing plays a critical role in ensuring good electrical contact while avoiding issues like bridging, where solder connects unintended pads, causing shorts.

What is the body to body clearance for smt parts？

The spacing between SMD pads is often defined by the component’s package type.

For example:

– For a 0603 package, the typical pad spacing might be around 0.8 mm.

– For a larger 1206 package, it could be around 1.5 mm or more.

In addition to pad spacing, the size of the pad must be carefully chosen to ensure that it supports the component correctly without causing issues during soldering. If the pads are too close, there is a higher chance of bridging, especially when using automated processes like reflow soldering. On the other hand, too much spacing could lead to poor contact, reducing the reliability of the connection.

What Is the Difference Between SMT and SMD Components?

SMT (Surface Mount Technology) refers to the process of mounting components directly onto the surface of a PCB. SMD (Surface Mount Device) is the term for the components themselves.

In essence:

SMT: The technology and process of assembling components on a PCB.

SMD: The individual components that are placed using SMT techniques.

The two terms are often used interchangeably, but it’s helpful to remember that SMT refers to the process, while SMD refers to the devices used in that process.

SMT has advantages over older methods like through-hole mounting, including reduced size and weight, faster production, and the ability to place components on both sides of the PCB. SMD components are designed specifically to benefit from these advantages, often smaller and lighter than their through-hole counterparts.

How Close Can PCB Traces Be?

PCB traces are the conductive pathways that connect components on the board. Proper spacing between these traces is critical to avoid electrical interference, arcing, or short circuits.

What is the body to body clearance for smt parts？

The minimum trace clearance depends on the operating voltage and current. For low-voltage circuits, traces can be closer together, but higher-voltage designs require more significant separation to avoid electrical breakdown.

For example:

– For a PCB operating at less than 100V, a typical trace clearance might be around 0.2 mm to 0.5 mm.

– For high-voltage designs (e.g., 600V), trace spacing might need to increase to 3 mm or more.

It’s essential to follow the manufacturer’s recommendations and industry standards like IPC-2221 when determining trace clearance. Additionally, wider spacing can improve performance, particularly in high-frequency circuits where issues like crosstalk become more prominent.

What Is the Edge Clearance of a PCB?

Edge clearance refers to the distance between components or traces and the outer edges of the PCB. Ensuring adequate clearance near the edges prevents damage during manufacturing and assembly. It also allows room for board routing, where mechanical tooling may cut the board from a larger panel.

The general rule for edge clearance is to keep components at least 1 mm to 2 mm away from the PCB’s edge. This gives enough room for mechanical handling, ensures that traces aren’t damaged during cutting, and reduces the risk of short circuits due to edge contact.

In designs that incorporate connectors or other mechanical features near the board’s edge, additional clearance may be necessary to accommodate mounting holes or alignment features.

Additional Considerations for SMT Clearance and Spacing

In addition to the factors already covered, there are several other considerations when designing SMT PCBs:

  • 1. Thermal Considerations: Proper body-to-body clearance helps ensure that heat can dissipate effectively. Crowding components too closely together can lead to hot spots, reducing the life of the board and its components.
  • 2. Automated Assembly: If you’re using automated pick-and-place machines for assembly, sufficient clearance is needed for accurate placement. Overly tight layouts can lead to assembly errors or slower production times.
  • 3. Manufacturability: PCB fabricators have limitations on how closely they can place components, traces, and vias. These limitations vary from one manufacturer to another, so it’s essential to consult with them early in the design process to avoid issues during production.
  • 4. Inspection and Rework: Allowing enough space between components simplifies inspection and rework. If something goes wrong during assembly, having accessible components makes repairs quicker and more cost-effective.

Practical Tips for Ensuring Proper Clearance Between PCBs

  • Use Design Guidelines: Always reference your PCB manufacturer’s design rules. These will give you specific guidance on spacing, trace widths, and clearances based on their capabilities.
  • Optimize Component Placement: Group similar components together when possible. For instance, resistors and capacitors can often be placed closer together than components that require heat dissipation.
  • Account for Heat Dissipation: Keep heat-generating components like power ICs and transformers farther apart from sensitive components like sensors. This minimizes heat transfer and reduces the chance of thermal stress.
  • Perform Electrical Testing: Simulate your design using PCB software to check for potential clearance violations, especially around high-voltage areas and traces that could experience crosstalk.
  • Test with Prototypes: Before full production, build a prototype to test clearance in real-world conditions. This will allow you to identify any spacing issues and resolve them before scaling production.

Conclusion:

Achieving proper body-to-body clearance for SMT parts is critical for the performance and longevity of your PCB. By following the established guidelines for component spacing, pad placement, trace clearance, and edge spacing, you can ensure that your design meets both functional and manufacturability requirements. This not only improves the reliability of your board but also reduces the likelihood of costly errors during assembly and operation.

Invest time in careful planning during the design phase to avoid unnecessary revisions later on. Working closely with your PCB manufacturer and utilizing design simulation tools can go a long way in ensuring your final product performs as expected.

In the end, understanding and applying the right clearance rules will result in a robust, reliable, and efficient PCB design that meets the demands of modern electronics.

Tags: ,
Posted in best pcb, bestpcb, SMT Technology | No Comments »

What are the common compenents on a pcba?

11 9 月, 2024

In the field of electronic technology, PCBA (Printed Circuit Board Assembly) plays a vital role as a core component of electronic products. The various components on the PCBA are like precise components, which together build an efficient and stable electronic system. Among them, common components include resistors, capacitors, inductors, diodes, transistors, etc., each of which plays a unique function.

What is PCBA components?

PCBA is the assembly of printed circuit boards (PCBs), which is the abbreviation of Printed Circuit Board Assembly. ‌It refers to the process of installing and connecting components on printed circuit boards, including soldering electronic components to circuit boards through surface mounting technology (SMT) or through-hole mounting technology (DIP) to form electronic assemblies with specific functions.

What are the common compenents on a pcba?

Each PCBA is essentially a finished circuit board with all the necessary electronic components installed on it. These components work together to ensure that the device operates as expected. The exact combination of components depends on the requirements of the device. However, there are some common components on most PCBA assemblies.

PCBA is a key component in electronic devices and is widely used in various electronic devices and systems, such as home appliances, 3C digital products, network communication equipment, automotive electronics, military research and other fields.

In general, PCBA is a core component in electronic devices. It realizes the electrical connection and mechanical support of various components in electronic devices by mounting electronic components on printed circuit boards, so that electronic devices can work properly.

What are PCBA made of?

PCBA consists of printed circuit boards (PCBs), electronic components and solder. ‌

  • ‌Printed circuit board (PCB): It is the core part of PCBA, made of insulating materials and has conductive traces and pads for connecting electronic components.
  • ‌Electronic components: It includes resistors, capacitors, transistors, integrated circuits and other components to provide circuit functions.
  • ‌Solder: The role of solder is to firmly fix electronic components on PCBs to ensure the correct connection of circuits and the reliability of components.

The production process of PCBA involves steps such as PCB design, manufacturing, component placement, soldering and testing to ensure that electronic devices can work properly.

What is common on a circuit board?

1. Capacitor

Capacitors are the most common components on circuit boards after resistors. Their main function is to store charge. Capacitors consist of two metal plates separated by a dielectric. The two plates store opposite charges. The dielectric is used to separate them.

What are the common compenents on a pcba?

2. Resistors

Resistors are an indispensable component on circuit boards. They are mainly used to limit the flow of current and protect circuits. They actively dissipate or disperse electricity by converting electrical energy into internal energy, thereby reducing the current flowing through the circuit.

What are the common compenents on a pcba?

3. Potentiometers

Potentiometers are essentially more complex versions of simple resistors. The resistance value of a simple resistor is set, while the resistance value of a potentiometer can be changed as needed. It has three leads and consists of a resistor body and a movable brush. When the brush moves along the resistor body, the output end will obtain a resistance value or voltage that is related to the displacement.

4. Inductors

Inductors are one of the three members of passive linear components on circuit boards. The other two are capacitors and resistors. Inductors are also used to store energy, but they do so by creating a magnetic field, whereas capacitors store energy. Static electricity is used to generate energy.

An inductor is a component that converts electrical energy into magnetic energy and stores it. Its structure is similar to that of a transformer, but it has only one winding. Inductors primarily block changes in current, and when no current is flowing, a circuit is closed to block the flow of current; when current is flowing, a circuit is opened to try to maintain the current.

5. Diode

The diode is one of the most important components on a circuit board, and its main function is to limit the flow of current. Since current can flow from the positive terminal to the negative terminal and vice versa, but not both at the same time, the diode can achieve this by providing infinite resistance in one direction and zero resistance in the other direction.

What are the common compenents on a pcba?

6. Transformer

The transformer is a key component in a circuit board to ensure that electrical energy is transferred efficiently. Its main function is to convert voltage, either stepping it up or stepping it down. A transformer consists of a soft iron core with at least two windings on it, the primary and secondary coils.

7. Transistor

Transistors are core components in modern electronics and are widely used in various electronic devices such as amplifiers, switches, and computers. There are two main types of transistors: bipolar and field effect transistors (FET). Bipolar transistors have three pins: collector, base, and emitter.

8. Integrated Circuits

Integrated circuits are an important part of circuit boards. They are made by shrinking certain circuits and electronic components and then embedding them in semiconductor films.

They make it possible to package a large number of electronic components into a single chip, realizing the functions of multiple electronic components on a small chip. Integrated circuits are widely used in electronic devices such as computers, mobile phones, and televisions, and are the brains of the entire PCB.

9. Switching elements

Switching elements play the role of controlling the on and off of current in circuit boards. Diodes are a commonly used switching element. When a forward voltage is applied, its resistance is very small, showing an on state, like a switched on switch; under the action of a reverse voltage, its resistance becomes very large, showing an off state, like a switched off switch.

10. Relays

Relays are important components on circuit boards and are divided into two types: normally open and normally closed. Electromagnetic relays work by using the suction force generated by the current in the input circuit between the electromagnet core and the armature.

11. Sensors

Sensors are circuit board components that can detect changes in the environment and provide signals reflecting the changes after identification. Sensors convert physical energy into electrical energy and are often called sensors because they send electrical signals to various components on the circuit board (because they can convert energy into another energy).

How to identify components on a circuit board?

The components on the circuit board can be mainly divided into two categories: passive components and active components. Passive components include resistors, capacitors, inductors, etc., which are mainly used to change the basic parameters of the circuit such as current, voltage and frequency.

Components on the circuit board usually have corresponding identification, which provides important information about the components, such as model, specification, manufacturer, etc. For passive components such as resistors, capacitors and inductors, their identification is usually printed directly on the component body, and their parameter values ​​are indicated by color rings or numbers.

What is the difference between PCB and PCBA?

1. About PCB

PCB is the abbreviation of printed circuit board. It is an important electronic component in the electronics industry, a support for electronic components, and a carrier for electrical connection of electronic components. PCB is widely used in the production and manufacturing of electronic products, and its characteristics are as follows:

  • High wiring density, small size, light weight, conducive to miniaturization of electronic equipment.
  • Reduces wiring and assembly errors, saving equipment maintenance, debugging and inspection time.
  • Facilitates mechanized and automated production, improves productivity and reduces the cost of electronic equipment.
  • The design can be standardized, which is conducive to interchangeability.

2. About PCBA

  • PCBA is the entire process of SMT mounting on PCB blank board and then DIP plug-in.
  • SMT mounting mainly uses mounting machines to mount some micro-small parts on PCB board.
  • DIP means “plug-in”, which means inserting parts on PCB board. This is a plug-in form of integrated parts when some parts are large in size and not suitable for mounting technology.
  • Both SMT and DIP are ways to integrate parts on PCB boards. The main difference is that SMT does not require drilling holes on the PCB, while DIP requires the pins of the parts to be inserted into the already drilled holes.

What does SMT mean in PCBA?

SMT in PCBA is the abbreviation of Surface Mount Technology. ‌

SMT is an electronic processing technology used to mount electronic components on the surface of a printed circuit board (PCBA substrate) to produce electronic products.

SMT technology is the most popular technology and process in the electronic assembly industry, which can achieve high-density, high-reliability, miniaturization, low-cost electronic product assembly and automate production.

As the development trend of electronic products is towards miniaturization and precision, traditional perforated plug-in components can no longer meet the demand. Therefore, SMT technology is widely used in the electronic processing industry and has become one of the most important assembly processes‌.

Conclusion:

In short, the common components on PCBA, with their respective characteristics and functions, jointly build a complex and efficient electronic system. Their synergistic effect ensures the stable operation and excellent performance of electronic products, and plays an irreplaceable and important role in modern technological life.

Tags: ,
Posted in best pcb, bestpcb, PCBA | No Comments »

Does A Circuit Board Base Have Low Resistance?

10 9 月, 2024

What is Resistance in a Circuit Board?

Resistance in a circuit board determines how easily electric current flows through the board. Every component and trace on the board offers some resistance, but the goal is to minimize it. Resistance happens when the flow of electrons is blocked or slowed down by the material they travel through. This blockage causes energy loss, often as heat.

In printed circuit boards (PCBs), low resistance is preferred in traces and paths to ensure smooth current flow. However, resistors are intentionally added in circuits to control and manage current flow, protecting sensitive components.

Does A Circuit Board Base Have Low Resistance?

What is the Base of a Circuit Board?

The base of a circuit board is the foundation on which components are mounted and connected. The copper layers, laminated onto the base, provide the conductive pathways that allow current to flow between components. It usually consists of layers of different materials, including a non-conductive substrate like fiberglass, often referred to as FR4. Some other materials also can be used as the base of circuit board, like:

  • Glass fiber cloth substrate: commonly used in the production of double panels and multi-layer boards, with good mechanical properties and cost effectiveness.
  • Paper substrate: lower cost suitable for cost-sensitive applications.
  • Epoxy resin substrate: it has good mechanical properties and thermal stability, widely used in electronic products
  • Polyimide substrate: it has excellent high temperature resistance, suitable for high performance electronic products.
  • Polytetrafluoroethylene (PTFE) substrate: very high temperature resistance and low dielectric constant, suitable for high frequency and high temperature environments.
  • Ceramic substrates: such as alumina, aluminum nitride, etc., with high thermal stability and low dielectric constant, suitable for extreme environments.
  • Teflon (ETFE) substrate, it has good corrosion resistance, high frequency properties and low dielectric constant.
  • Metal substrates: metal materials like aluminum or copper are always serve as the base of metal core PCBs, they have very good thermal conductivity, and suitable for high power applications where need good heat dissipation.

How Does a Basic Circuit Board Work?

The basic circuit board connects various electronic components through conductive paths called traces, and performs specific functions through the interaction of electronic components. These tracks are made of copper and are designed to create specific circuits that control the flow of electricity. The circuit board uses insulating materials to isolate the conductive layer of copper foil on the surface, so that the current flows in each component along the pre-designed path to complete the functions of work, amplification, attenuation, modulation, demodulation, coding and so on.

Components such as capacitors, resistors, transistors, and diodes are soldered onto the board. The current flows through the components, following the paths designed in the layout, executing the required tasks, such as powering an LED or processing signals.

For the circuit to work, all components must be properly connected and powered. Any break in these connections can disrupt the flow of current, leading to malfunctions.

Does A Circuit Board Base Have Low Resistance?

The main components and functions of the circuit board:

  • Pad – metal holes for welding the pins of components.
  • Through hole – there are metal through holes and non-metal through holes, used to connect the component pins between each layer.
  • Conductor – the conductive path connecting electronic components.
  • Components – such as resistors, capacitors, inductors, etc., are connected to each other by conducting lines.
  • Connector – used to connect external devices.
  • Electrical boundary – defines the electrical characteristics of the board.

Does an Open Circuit Have Low Resistance?

No, an open circuit has high resistance, often considered infinite.

Open circuit refers to the circuit state when no current passes between two points in the circuit or is connected by a conductor with a very large impedance value (or resistance value). When the branch between two points in the circuit is open, the potential difference between the two points is called “open voltage” and can be measured by a voltmeter. In the open state, because there is no current flow, the resistance is very high, this is because the current path in the open circuit is interrupted, resulting in the current cannot flow, so that the resistance in the open state is extremely high ‌

In contrast, a short circuit refers to the situation where the current does not pass through the electrical appliance and directly constitutes a path. In a short circuit, the resistance in the circuit is small, because the current flows directly through the wire, rather than through the load, resulting in a large current. In this state, the fuse may automatically blow due to excessive current, to prevent the wire from causing a fire due to heat ‌

How to Tell If a Circuit Board is Shorted?

Identifying a shorted circuit board involves looking for signs like:

  • Burn marks or discoloration on the board.
  • Swollen or damaged components.
  • Overheating, causing the board to feel hot to the touch.
  • The device or board not powering on or malfunctioning.

To confirm a short, a multimeter can be used. By measuring the resistance between points where there should be separation, a very low resistance could indicate a short. This can help pinpoint faulty components or traces.

Does A Circuit Board Base Have Low Resistance?

How to Check Resistors on a Circuit Board?

To check resistors on a circuit board, you can use a multimeter in resistance mode.

  • Turn off the power to the board and discharge capacitors to avoid any residual current.
  • Set the multimeter to the appropriate resistance range.
  • Place the probes across the resistor’s terminals and read the value displayed on the meter.

Compare this value with the expected resistance value, usually printed on the resistor or found in the circuit’s schematic. A large discrepancy could indicate a faulty resistor.

How Are Circuit Boards Grounded?

Circuit boards are grounded by connecting the ground plane, often a large layer of copper, to a grounding point. The grounding modes of the circuit board mainly include single point grounding, multi-point grounding, floating ground and virtual ground. ‌

  • Single-point grounding

Single-point grounding ‌ is suitable for low-frequency circuits where only one physical point in the entire circuit system is defined as the grounding reference point and all other points that need to be grounded are directly connected to this point. This approach can reduce common ground impedance coupling and low-frequency ground loop interference, and is usually used for circuits with frequencies less than 1MHz.

  • Multi-point grounding

Multipoint grounding ‌ is suitable for high-frequency circuits, where each ground point of the electronic device is directly connected to the nearest ground plane (that is, the metal base plate of the device). This method can reduce the interference generated by the common ground impedance, and also reduce the parasitic capacitance and inductance, which is usually used for circuits with frequencies greater than 10MHz.

  • Floating ground

‌Floating ‌ that is, the ground of the circuit is connected to the ground without a conductor, but at a higher potential. The advantage of floating ground is that the circuit is not affected by geoelectrical properties, and can prevent electromagnetic interference caused by the coupling of common ground impedance circuits. However, the disadvantage of this method is that it is affected by the parasitic capacitance, which leads to the change of ground potential and increases the inductive interference to the analog circuit.

  • Virtual ground

Virtual ground ‌ is similar to floating ground and can be understood as the “floating ground” when the operational amplifier is short and broken.

What is the Rule for Resistance in a Circuit?

The fundamental rule of resistance is governed by Ohm’s Law: V=IR, where voltage (V) is equal to the current (I) multiplied by resistance (R). This shows that the resistance directly affects how much current flows for a given voltage.

In circuits, resistors are used to control current, and their value determines how much current is allowed through. For example, higher resistance lowers the current flow, while lower resistance allows more current to pass.

With over 18 years as an industry leader, Best Technology is one of the most experienced PCB and PCB assembly manufacturer in Asia. We are highly specialized not only in quick-turn PCB prototype and PCB assembly, but also medium and small volume PCB fabrication. In Best Technology, you can enjoy a full-comprehensive one-stop service from PCB design, layout, PCB fabricate, PCB assembly, function testing and delivery. We always try our best to fabricate your PCB with copper clad laminate with the highest quality to meet your demands.

If you have any questions, please feel free to contact us with sales@bestpcbs.com, we will be happy to help you.

Posted in best pcb, bestpcb, FAQ, FR4 PCB | No Comments »

PCB Quote Packaging is What Type of Engineering?

10 9 月, 2024

PCB Full Form

PCB stands for Printed Circuit Board, a key component in almost all electronic devices. It connects and supports electronic components using conductive tracks, pads, and other features. The design and production of PCBs require precise engineering, as they are crucial for the functionality of the final product.

What is PCB Quote Packaging?

PCB quote packaging refers to the process of gathering and organizing all the details needed to estimate the cost of producing a PCB. This includes not only the design specifications but also the materials, manufacturing processes, and other engineering considerations. It’s not just a financial calculation but a complete engineering analysis that ensures the quote is accurate, feasible, and optimized for production.

The quote must consider every detail that affects production—like material types, size, complexity, and production volume. The aim is to package all these details into a clear, comprehensive quote, ensuring the client understands what they are paying for and why.

Why is Engineering Important in PCB Quote Packaging?

Engineering plays a vital role in the PCB quoting process because it’s not just about estimating costs. It’s about understanding the technical requirements and ensuring that every aspect of the design and production is accounted for. Engineers analyze the design, materials, and manufacturing methods to ensure the quote reflects the real cost of production.

Without engineering insight, a quote could be inaccurate, leading to cost overruns or production delays. Engineers make sure that all technical details, such as layer count, trace width, and component placement, are properly considered.

What Are the Key Factors in a PCB Quote?

Several factors come into play when preparing a PCB quote:

PCB Quote Packaging is What Type of Engineering?

1. Type of manufacturing process

The technical type of PCB determines its complexity and cost. For example, simple single panels cost much less than multi-layer panels, while flexible circuits (FPC) or rigid and flexible panels require more complex manufacturing processes and naturally cost more. In addition, whether advanced technologies such as microvias, laser drilling, blind holes or buried holes are required can also have a significant impact on the quotation.

2. Material type

Materials are an important part of PCB costs. Common materials include FR4, ceramics, metal substrates, etc. FR4 is the most common base material and is suitable for most conventional applications, but for high-frequency, high-temperature environments, ceramic or metal-based materials may be more suitable, but their price is relatively high. Choosing the right material not only affects the performance, but also directly affects the cost.

3. IPC level

IPC grades reflect the quality standards of PCB manufacturing, commonly used are IPC-A-600 grades 1, 2 and 3. The higher the grade, the more stringent the manufacturing requirements, and the corresponding increase in cost. For example, grade 3 PCBS are usually used in high-demand fields such as aerospace and medical equipment, which require higher accuracy and quality control, so the price is higher.

4. Circuit design

PCB circuit design complexity directly affects manufacturing costs. Including wire width, spacing, hole size and so on, the production process has put forward different requirements. High density interconnect (HDI) boards typically require more elaborate wiring techniques and may involve the use of microvias, which will increase the difficulty and cost of manufacturing.

5. PCB size and yield

The size of the PCB directly affects the amount of material used, and the larger the board, the more material is needed. In addition, the yield is also an important factor affecting the quotation. PCB manufacturing with complex design or high density lines is prone to defects, resulting in decreased yield. That means manufacturers may need to produce more boards to meet orders, increasing costs.

6. Material thickness

Different applications require different thicknesses of PCB materials. The standard FR4 thickness is usually 1.6mm, but thinner or thicker boards are sometimes used. Changes in material thickness can affect the overall cost, especially if thicker sheets require special processing or higher strength, and manufacturing expenses will increase accordingly.

7. Copper thickness

The copper thickness in the PCB usually has a standard choice, such as 1oz, 2oz or even thicker copper layers. The higher the copper thickness, the better the conductivity of the PCB, suitable for high-current applications, but the increase in copper thickness will significantly increase the manufacturing cost, especially in the plating and etching process requires additional materials and processes.

8. Stack-up method

The stacking mode determines the number of layers and the interlayer structure of the PCB. Complex multilayer boards or HDI boards require more complex lamination processes. For example, the lamination method may involve multiple pressing, the use of prepregs or special insulation materials. Each additional layer requires more manufacturing steps, resulting in increased costs.

9. Quantity

The quantity of the order has a direct impact on the PCB quotation. High-volume production can reduce unit prices by spreading tooling and setup costs, while small-batch orders are typically more expensive due to relatively high production preparation and start-up costs.

10. Delivery date

The shorter the delivery time, the higher the quotation. Rush orders require prioritizing production, which can disrupt the plant’s production schedule and require additional resource deployment. To meet urgent delivery deadlines, manufacturers may need to work overtime or speed up production, increasing overall production costs.

These are just a few examples, but they show how engineering considerations are woven into every part of the quoting process.

PCB Manufacturing Process

How Do Engineers Calculate PCB Manufacturing Costs?

Engineers calculate PCB manufacturing costs by considering the design specifications and the production methods needed to meet those requirements. They start by analyzing the PCB’s layout and design, which determines factors like layer count, trace width, and hole size. Each of these elements has a direct impact on the materials used and the manufacturing process.

They also consider the assembly process—whether it’s surface-mount or through-hole—and what testing will be required. After evaluating these details, they calculate the costs associated with each step of the manufacturing process. This ensures the final quote is both accurate and comprehensive.

What Type of Engineer Designs PCBs?

Engineers who design PCBs typically have a bachelor’s degree or above in electrical engineering, automation, computer science, or a related field ‌ and understand the basics of electronic design, printed circuit board (PCB), and electronics manufacturing in the PCB industry. These engineers need to master PCB design software such as Altium Designer, Eagle PCB, PADS, or CAD, etc., as well as the use of related manufacturing and testing tools. At the same time, they need to have a knowledge of the PCB industry, a certain circuit design and electronic components knowledge, including digital and analog circuits, signal processing, power electronics, embedded systems, communication technology, etc. In addition, holding certificates such as IPC-2221/2222, IPC-A-600/610, and CID (Certified Interconnect Designer) can prove that they have relevant professional knowledge and skills, which can help improve their career competitiveness.

These engineers also need to have a strong sense of responsibility and team spirit, have good communication and coordination skills, and be able to work effectively with customers, manufacturers, and other team members. For junior engineers, it is recommended to study in a single point of depth, such as PCB design, SI simulation, thermal design, EMC design, product testing, etc., and then start from this advantage point to expand the scope of knowledge

What Materials Are Considered During PCB Quote Packaging?

The type of material used for a PCB is a major cost driver. Common materials include:

  • FR4

This is the most common material used in PCBs due to its balance of cost and performance. It’s versatile and reliable for most standard applications.

PCB Quote Packaging is What Type of Engineering?
  • Metal Core

Metal core PCBs are used in applications where heat dissipation is a concern, such as LED lighting. These boards are more expensive due to the metal layer.

PCB Quote Packaging is What Type of Engineering?
  • Ceramic

Ceramic materials are used for high-frequency or high-temperature applications. They are more costly but offer better performance in extreme conditions.

PCB Quote Packaging is What Type of Engineering?

Each material has its own manufacturing process, which also affects the cost. For instance, metal core boards may require different drilling techniques compared to standard FR4 boards. Engineers must consider these details when preparing a quote.

How Does the Choice of PCB Manufacturing Methods Impact the Quote?

The method used to manufacture the PCB can greatly impact the final cost. Common methods include:

  • Surface-Mount Technology (SMT): This is the most common method for modern PCB assembly. It’s efficient and cost-effective for most applications.
  • Through-Hole Technology (THT): This method is used for components that require a stronger mechanical bond. It’s more labor-intensive and, therefore, more expensive.
  • Flexible and Rigid-Flex Manufacturing: These types of PCBs require specialized processes and materials, which can increase the cost.

Additionally, advanced techniques like laser drilling for microvias or selective soldering for complex assemblies may be necessary for high-precision designs. Each of these methods requires careful consideration, and engineers must choose the best process for both the design and the budget.

Who Designs PCB?

Since 2006, Best Technology has been the leading PCB quick turn manufacturer specializing in both PCB prototype and production quantities, initially produced single-sided and double-sided printed circuit boards for the consumer electronics market. Now, we provide not only FR4 PCB, but also some special PCB like flex circuit, metal core PCB, ceramic PCB, extra thin PCB, HDI PCB, IC substrate, busbar PCB, heavy copper PCB and so on. We can make 50 layers PCB, and it is not our limit.

Nowadays, Best Technology has grown to become a major PCB manufacturer in Asia to serve in diverse customers base such as electronics appliance, communication, educational electronics, power supplies, automations.

For more information about PCB, or to learn more about the online quote and ordering process, please visit www.bestpcbs.com

Tags: ,
Posted in best pcb, bestpcb, Design Guide, FAQ, FR4 PCB, Metal Core PCB, PCB Technology | No Comments »

How does solder paste inspection work?

10 9 月, 2024

In the field of electronic manufacturing, precision is the key. One of the key processes is to ensure that the solder paste applied to the circuit board is in the correct position and in the correct amount. This process is called solder paste inspection (SPI) and plays a key role in the reliability of electronic products.

In the SMT patch process, solder paste inspection is the first and most important step, which determines the subsequent soldering quality and other issues, so the solder paste inspection step is crucial.

How to check solder paste?

1. Visual observation:

Under natural light or good lighting conditions, directly observe the appearance characteristics of the solder paste such as color and state with the naked eye. Normal solder paste has uniform color and no obvious particle agglomeration, precipitation, stratification and other phenomena.

How does solder paste inspection work?

2. Viscosity detection:

Viscosity is an important physical performance indicator of solder paste, which has a great influence on printing performance and welding quality. Professional equipment such as rotary viscometer can be used for detection.

In general, the viscosity of solder paste should be within a certain range and meet the product specification requirements. If the viscosity is too high, it may cause printing difficulties and poor demolding; if the viscosity is too low, the solder paste may flow during printing, affecting printing accuracy.

3. Metal content detection:

Metal content directly affects the welding performance of solder paste and the strength of solder joints. Chemical analysis or spectral analysis is usually used for detection.

4. Particle size detection:

The particle size and distribution of metal particles in solder paste will also affect its performance. Laser particle size analyzer and other equipment can be used for detection.

This method determines the particle size distribution of particles by measuring the scattering or diffraction of metal particles on laser. Generally, the particle size distribution of metal particles is required to be concentrated within a certain range, and the proportion of particles that are too large or too small should not be too high.

What is the most common solder paste?

The most common solder paste is rosin solder paste.

‌Rosin solder paste is widely used because of its excellent flux and protective effect, as well as the protective film formed after welding, which has a protective effect on solder joints. Even if cleaning is not required, there will be no corrosion.

In addition, rosin is easy to mix with other ingredients, which can play a role in adjusting viscosity, so that the metal powder in the solder paste is not easy to precipitate and stratify. These characteristics make rosin solder paste the most common type of solder paste.

What are the advantages of solder paste inspection?

Solder paste inspection has many advantages, as follows:

1. Ensure product quality:

  • Discover problems in advance: By inspecting solder paste before welding, you can find quality problems of the solder paste itself in time, such as uneven composition, inappropriate metal particle size, insufficient flux activity, etc., to ensure the welding quality of electronic products from the source.
  • Optimize welding process: By testing the viscosity, thixotropy and other performance indicators of solder paste, you can determine whether the solder paste is suitable for the current printing process and welding equipment.

2. Improve production efficiency:

  • Reduce rework of defective products: Testing solder paste can quickly screen out solder paste that does not meet quality requirements and avoid using these solder pastes in production, thereby reducing defective products caused by solder paste quality problems.
  • Easy to control the production process: In large-scale production, you can regularly test the solder paste, monitor the quality changes of the solder paste in real time, and detect abnormal conditions in the production process in time.

3. Reduce production costs:

  • Avoid material waste: By testing the solder paste, you can avoid using problematic solder paste, reduce material waste and unnecessary production costs.
  • Extend equipment life: Good quality solder paste can reduce wear and corrosion on printing equipment and welding equipment, and reduce equipment maintenance costs and replacement frequency.

4. Meet industry standards and customer requirements:

  • Meet industry specifications: The electronics industry has strict standards and specifications for welding quality, such as IPC standards. Conducting solder paste inspection can ensure that the quality of solder paste meets the requirements of these standards and specifications and improve the competitiveness of enterprises.
  • Meet customer needs: In the production process of electronic products, customers usually have clear requirements for welding quality. Through solder paste inspection, improve customer trust and satisfaction with the company and enhance the market competitiveness of the company.

What are the defects of solder paste inspection?

Although solder paste inspection is a key step, it is not without challenges. Some common defects found during SPI include:

  • Insufficient solder paste: If too little solder paste is used, it will result in fragile joints or poor electrical connections.
  • Too much solder paste: Too much solder paste can cause bridging between components, causing short circuits.
How does solder paste inspection work?
  • Misalignment: If the solder paste is not applied accurately, it may not align with the pads on the PCB, causing problems when placing components.
  • Collapse: In some cases, solder paste may spread too much after application, resulting in poor joint formation.
  • Solder balls: Small, unwanted solder balls may form around the pad, which may cause electrical shorts.

Do you need flux when using solder paste?

Additional flux is usually not required when using solder paste.

Solder paste itself contains flux ingredients. Solder paste is a paste-like substance made by evenly mixing solder alloy powder and flux. The role of flux in solder paste mainly includes removing oxides on the soldering surface, reducing the surface tension of solder, and promoting solder wetting and diffusion.

During the soldering process, the flux in the solder paste will work at the appropriate temperature to help achieve good soldering results. However, in some special cases, such as soldering some special materials or when there are extremely high requirements for soldering quality, additional flux may be considered, but this is a relatively special application scenario.

What is a solder paste inspection machine?

Solder Paste Inspection (SPI) is a device used to detect solder paste printed on a printed circuit board (PCB).

How does solder paste inspection work?

The main functions include:

1. Solder paste height measurement

  • Use laser scanning, optical imaging and other technologies to accurately measure the height of solder paste on the PCB pad.

2. Solder paste area measurement

  • Determine the coverage area of ​​solder paste on the pad. If the solder paste area is too small, a good solder connection may not be guaranteed; if the area is too large, it may overflow the pad, affecting the subsequent assembly process.

3. Volume measurement

  • Calculate the volume of solder paste based on height and area data. Accurate volume measurement helps ensure consistent solder paste volume for each solder joint, thereby improving the stability of soldering quality.

4. Defect detection

  • Misprint detection: Detect whether there is solder paste misprint on the PCB pad.
  • Offset detection: Detect whether the solder paste printing position is offset from the designed pad position.
  • Shape anomaly detection: Identify whether the shape of the solder paste is abnormal, such as irregular shape, unclear edges, etc. Shape anomalies may be due to problems in the printing process, which will affect the welding quality.

Solder paste inspection machines can detect solder paste quality problems in the printed circuit board production process in a timely manner, improve production efficiency and product quality, and reduce rework and scrap caused by poor soldering.

What is the best temperature for solder paste?

The optimal temperature range for solder paste is 150℃～180℃‌, and the time to maintain this temperature range should be 60～120 seconds to ensure that the solder paste can fully infiltrate the pads and component pins.

This temperature and time range is critical to controlling the quality of reflow soldering, as it involves the effective volatilization of flux and the full infiltration of pads, thereby ensuring the reliability and quality of soldering‌.

Conclusion:

Solder paste inspection is a key step in modern electronic manufacturing to ensure that solder paste is correctly and evenly applied to PCBs. By using advanced SPI machines, defects can be detected early, process control can be improved, and costs can be reduced. Whether using leaded or lead-free solder paste, ensuring the correct amount, alignment, and temperature is critical to forming strong and reliable solder joints.

BEST Technology has a professional solder paste inspection machine. Each PCB board must undergo rigorous testing. Choosing BEST Technology, you will get the highest quality PCB board.

Tags: , , , ,
Posted in best pcb, bestpcb, PCBA | No Comments »

Will the silver on the PCB oxidize?

10 9 月, 2024

Silver is widely used in printed circuit boards (PCBs) for its excellent conductivity and thermal properties. A common concern of manufacturers is whether silver will oxidize over time, which may affect the performance of the PCB. And how should it be treated after oxidation? How should it be stored during use, etc.

How to remove oxidation from PCB?

The methods for removing oxides from PCBs mainly include physical cleaning, chemical cleaning, and mechanical polishing.

Will the silver on the PCB oxidize?

1. ‌Physical cleaning‌:

Use alcohol or diluent to gently wipe the oxidized part until the oxide is removed. This method is suitable for removing the surface oxide layer, but it is not suitable for situations where the metal surface circuit has been damaged.

2. ‌Chemical cleaning‌:

Use specific cleaning agents such as deionized water, isopropyl alcohol, acetone, etc. to effectively remove residues and contamination.

In addition, cleaning and corrosion using acidic solutions or oxidants is also an effective chemical method, but it must be used with caution to avoid damage to the PCB board and other components.

3. ‌Mechanical polishing‌:

Use fine sandpaper or abrasive cloth to carefully polish the oxidized area to restore the conductivity of the metal. This method is suitable for removing thicker oxide layers, but you need to control the strength to avoid damaging the pad surface.

Before any cleaning and repair, be sure to disconnect the PCB power supply to ensure safety. For cases where oxidation has damaged the metal surface circuit, conductive paint needs to be used for repair, but be aware that excessive use of conductive paint may damage the circuit board. In addition, for unused PCBs, they should be stored in sealed bags or protective agents and checked regularly to ensure that they are not oxidized again.

Is silver oxidation permanent?

Silver oxidation is not permanent. ‌

Will the silver on the PCB oxidize?

Silver oxidation is caused by the reaction of silver with chemicals such as oxygen and sulfur in the air, resulting in a black silver sulfide film on the silver surface. This oxidation reaction is one of the main reasons for the blackening of PCBs.

However, silver oxidation is not permanent, because the oxide layer can be removed by cleaning and maintenance to restore the gloss of the PCB surface. For example, regular use of professional PCB cleaners or soaking the PCB in diluted detergent water, then gently scrubbing it with a soft brush, and finally rinsing it with clean water and drying it can effectively remove the oxide layer.

In addition, avoiding contact with chemicals, keeping dry, regularly checking and properly storing PCBs are also effective ways to prevent oxidation.

Therefore, although silver oxidation is inevitable, the rate of oxidation can be slowed down through proper care and maintenance.

What is the best way to Deoxidize silver?

The best way to remove silver oxide from PCBs is to use chemical stripping, which involves using a specific chemical solution to treat the silver plating so that it dissolves in the solution to achieve the purpose of removing the oxide.

The effectiveness of this method depends on the selection of appropriate chemical formulas and operating conditions to ensure that the silver layer can be completely stripped while avoiding corrosion to the base metal.

In chemical stripping, different formulas can be used to achieve the removal of the silver layer. For example, one formula includes a mixture of concentrated sulfuric acid and concentrated nitric acid, which is used at a temperature of 80°C until the silver layer is completely stripped.

Another formula includes a mixture of sulfuric acid, nitric acid, silver chloride and potassium cyanide, which is also used at a temperature of 80°C. These formulas need to be selected according to actual conditions, and attention should be paid to safety measures during operation to prevent corrosion of the base metal.

In addition, for the oxidation problem of PCB gold fingers, although it is not exactly the same as the method of removing silver oxide, some cleaning methods are provided, such as using erasers, alcohol cleaning, decontamination paste cleaning, scrubbing board grinding and electroplating treatment, which are also suitable for treating silver oxide, especially when the oxide is relatively mild.

In summary, the best way to remove PCB silver oxide is chemical stripping, which is achieved by selecting appropriate chemical solutions and operating conditions. For more serious oxidation situations, it may be necessary to combine physical and chemical methods for cleaning.

How do you save silver from oxidation?

The methods to prevent PCB silver from oxidation mainly include the following points:

  • Reasonable storage and packaging ‌: During storage and transportation, PCBs should be stored in a dry, ventilated, dust-free environment to avoid moisture and corrosion. Use appropriate packaging materials, such as moisture-proof bags, foam boxes, etc., to ensure the integrity and quality of the PCB.
Will the silver on the PCB oxidize?
  • ‌Surface treatment ‌: During the PCB surface treatment process, surface treatment methods such as gold plating and tin plating can be used to prevent oxidation.
  • Use anti-oxidation coating ‌: Anti-oxidation coating is an efficient and reliable method to prevent PCB oxidation. It can form a strong, corrosion-resistant protective layer on the surface of the PCB, effectively preventing the PCB from being damaged by oxidation.
  • Reduce contact with air and moisture‌: Make sure the gold fingers are stored in a dry environment and avoid long-term exposure or immersion in water.
  • ‌Use a protective coating‌: Applying a protective coating on the gold fingers can help prevent oxidation. This can be done using a variety of materials, such as nickel, palladium, or a thin layer of metal‌.
  • ‌Regular cleaning and inspection‌: Regular cleaning of the gold fingers can also help prevent oxidation. This is done using a soft brush and a cleaning solution specifically designed for PCBs‌. Check the status of the gold fingers regularly, and clean and maintain them immediately if any signs of oxidation are found‌.

What is the shelf life of immersion silver PCB?

The shelf life of immersion silver PCB is at least 12 months. ‌This shelf life is determined under proper storage conditions, that is, in a sealed package, with a temperature controlled at 22 degrees plus or minus 4 degrees, and a relative humidity of less than 70%.

Once the circuit board is taken out for use, it must be soldered within 24 hours to ensure that its quality and performance are not affected‌.

The thickness of immersion silver surface treatment is usually between 0.4 and 1 micron, and this treatment is widely used by chip manufacturers for baseline bonding, EMI shielding and metal dome contacts.

Its purpose is to provide a reliable surface treatment, ensuring that the PCB surface will not oxidize and maintain its electrical performance stability for a shelf life of 12 months according to the IPC J-STD-003 standard.

In addition, the shelf life of the circuit board is also affected by its surface treatment process. For example, the vacuum packaging storage period of immersion gold, electro-gold, and tin-spraying boards is 3 months, while the storage period after unpacking for OSP, immersion tin, and immersion silver boards is 48 hours, 72 hours, and 48 hours respectively.

This shows that immersion silver PCBs can maintain a long shelf life if they are not unpacked, but the soldering process needs to be completed as soon as possible before use to ensure their performance.

Conclusion:

Silver oxidation is a natural process, but it does not affect the performance of the PCB. The key to controlling silver oxidation is regular maintenance, proper storage, and quick action when rust occurs. It should be stored properly and coated with a protective coating when necessary.

Tags: , , , ,
Posted in best pcb, bestpcb, SMT Technology | No Comments »

1.2mm vs 1.6mm PCB: What PCB Thickness to Choose?

9 9 月, 2024

When designing or selecting a PCB board, thickness is a key consideration. The most common thicknesses are 1.2mm and 1.6mm PCB, but which one is right for you? Each has its advantages depending on the application. Whether you’re designing for compact devices, high-power applications, or something in between, choosing the right PCB thickness will impact performance, cost, and durability.

In this blog, we’ll compare the two most popular thicknesses—1.2mm and 1.6mm—and explore their key differences. We’ll help you understand why most PCBs are 1.6mm thick, when to consider 1.2mm PCBs, and what factors to keep in mind during your decision-making process.

1.2mm vs 1.6mm PCB: What PCB Thickness to Choose?

Why are PCBs 1.6mm Thick?

The 1.6mm thickness has become the standard for most PCBs. But why is this the preferred thickness? One reason is historical—it was a size that worked well for manufacturing processes when PCBs were first developed. Over time, this became the norm due to its balance between durability and flexibility.

From the perspective of process and cost, the thinner the PCB board, the higher the manufacturing cost. Because it is necessary to use higher levels of materials and more refined processes to meet the various requirements of PCB boards in the manufacturing process. At the same time, PCB boards that are too thin are also susceptible to environmental and mechanical forces and have poor stability. Therefore, under the premise of taking into account cost and stability, 1.6mm has become a more common PCB board thickness.

Secondly, from the perspective of compatibility and standardization, in the vacuum tube era, because the development and manufacturing of PCB substrates have not yet achieved industrial production, PCB board thickness is mainly determined according to the equipment housing/installation hardware or the required PCB board thickness. At that time, the 1.6mm specification gradually became the industry standard and provided compatibility and convenience for later PCB manufacturing and design.

In addition to 1.6mm, there are some other common PCB board thickness, such as 0.8mm, 1.0mm, 1.2mm, 2.0mm and so on. These thicknesses are usually selected based on specific application and design requirements.

For example, in the field of communications, the commonly used PCB board thickness is generally 0.8mm; In the field of consumer electronics, the commonly used PCB board thickness is generally 1.0mm. In addition, for some specific applications, you can also choose other non-standard thickness options, such as 0.4mm, 0.6mm, 2.4mm, etc.

How Thick is a 1.2mm PCB?

Compared to the standard 1.6mm, a 1.2mm PCB is thinner, which makes it ideal for compact designs where space is at a premium. The 1.2mm thickness reduces the overall weight of the PCB, which can be critical in devices like smartphones, wearables, and other portable gadgets.

Despite being thinner, 1.2mm PCBs can still provide good mechanical support and electrical performance, though they might not be as resistant to bending or mechanical stress as their thicker counterparts. This makes them better suited for applications that do not require heavy-duty handling or exposure to harsh environments.

1.2mm vs. 1.6mm PCB

So, how do you decide between a 1.2mm and a 1.6mm PCB? It depends on the specific needs of your project. Here are some factors to consider:

  • Mechanical Strength

A 1.6mm PCB is more rigid and can withstand greater mechanical stress, making it ideal for larger devices or environments where the board may face pressure or force. If your design requires a sturdy board, 1.6mm is a better option.

  • Compact Design

For smaller, more compact devices, a 1.2mm PCB can save valuable space and reduce the overall profile. This is especially important for handheld gadgets or portable electronics where size and weight matter.

  • Thermal Management

Thicker boards like the 1.6mm version have better thermal management properties, as they can dissipate heat more efficiently. If your PCB will handle high power or generate a lot of heat, the 1.6mm option may be a better fit.

  • Cost

While the difference in cost between 1.2mm and 1.6mm PCBs is usually minimal, thinner boards might be slightly more cost-effective, especially for large-volume production. However, always weigh this against the performance needs of your application.

Ultimately, the decision comes down to the balance between durability, size, and the operating environment of your product.

Is Thinner PCB Better?

A thinner PCB, like the 1.2mm version, can be better in certain applications, but it’s not universally superior. The key benefit is the reduced thickness, which translates to lighter and more compact products. This is why thinner PCBs are favored in modern consumer electronics where every millimeter counts.

However, thinner PCBs are less rigid, making them more prone to bending or warping under pressure. If the PCB is subjected to mechanical stress or has to endure rough handling, a 1.6mm thickness might be the safer choice.

For low-stress applications, such as small gadgets or tightly packed devices, a 1.2mm PCB can offer the perfect balance of performance and size. The goal is to match the thickness to the demands of your specific project.

What is the Tolerance of a 1.6mm PCB?

PCB manufacturers often specify tolerances to account for minor variations in thickness during production. For a 1.6mm PCB, the typical tolerance range is around ±0.10mm, though this can vary based on the manufacturer and specific requirements of the project.

Tolerances are crucial in ensuring that the PCB fits within the required mechanical constraints of the final product. When designing a product, it’s essential to account for this tolerance, especially if your design requires exact thickness dimensions.

The tolerance of a 1.6mm PCB helps ensure consistent performance, even with minor deviations in the manufacturing process.

How Thick is a Standard 2-Layer PCB?

A standard 2-layer PCB typically ranges from 1.6mm to 2.4mm in thickness. However, 1.6mm is the most common thickness for 2-layer boards used in a wide range of applications.

The two layers refer to the copper traces that are used for electrical connections, and the thickness of the board itself determines its strength, thermal properties, and overall performance. In most cases, a 1.6mm thickness offers an ideal balance for general use, providing both durability and flexibility in terms of design and assembly.

How to Choose a Suitable PCB Thickness?

When choosing the thickness of a PCB, several factors need to be considered:

1. Weight

Weight is a key factor. Thinner boards tend to be more fragile and are more likely to break. Therefore, if lightweight is not a strict requirement, thicker boards are usually the better choice.

2. Flexibility

Flexibility is another important consideration. Thinner boards are generally more flexible, but they are also more prone to breaking. Thicker boards offer less flexibility but provide greater stability.

3. Space

The amount of space available in your device is crucial when deciding on PCB thickness. If your device has enough room to accommodate a thicker PCB, then using a thicker board is advisable. On the other hand, if the device is compact, a thinner PCB may be necessary to fit into the available space.

4. Type of Connectors and Components

The type of connectors and components you plan to use also influences the PCB thickness. Different components may have specific requirements that determine the board’s thickness.

5. Dimensions and Design

When selecting PCB thickness, factors such as the dimensions of the PCB, the number of layers, the weight of the installed components, the installation method, and impedance should all be considered. A general rule of thumb is: when the aspect ratio of the PCB (length to width) is not greater than 2 and the width-to-thickness ratio is not greater than 150, the performance is optimal. The width here refers to the smaller dimension between the depth or height of the PCB.

For plug-in boards mounted in vertical boxes, the thickness should fully consider deformation issues. For PCBs that are not box-mounted, if the size is smaller than 300mm x 250mm, 1.6mm to 2mm thick boards are preferred. Larger PCBs should use 2mm, 2.4mm, 3mm, 3.2mm, 3.5mm, or even thicker boards, but it is best to avoid exceeding 4mm.

6. Copper Thickness, Layers, and Signal Type

When determining the PCB thickness, you should also factor in the copper thickness, the material of the board, the number of PCB layers, the types of signals it will carry, and the type of through-holes being used. The operating environment is another key consideration.

PCB Manufacturing Considerations

Several manufacturing factors also influence the final PCB thickness:

  • Drilling equipment capability
  • Copper thickness
  • Number of layers
  • Board cutting method

For non-standard thickness PCB designs, additional factors include:

1. Manufacturer Capability

The first consideration is whether your PCB manufacturer has the equipment and capability to produce the specific thickness you need. This decision should be made early in the design process, along with other Design for Manufacturing (DFM) requirements. Otherwise, you may need to make changes and redesign your PCB stack-up.

2. Extended Delivery Time

If your manufacturer does not stock the materials required for non-standard thickness, it could delay the production timeline. Therefore, it’s essential to consider the delivery time when choosing a non-standard thickness.

3. Additional Costs

This is perhaps the most important point: you need to evaluate the cost of special materials, additional manufacturing costs, and the potential impact of delayed delivery to determine if the extra expenses are justifiable.

Opting for standard PCB thicknesses typically results in faster production and lower costs. However, if you decide on a non-standard thickness, it’s crucial to communicate with your manufacturer early in the design phase. This ensures that they can meet your requirements, and you’ll also need to clarify lead times and any additional manufacturing costs.

FAQs

Q1: Can I customize the thickness of my PCB?

Yes, many manufacturers offer custom thickness options ranging from thinner boards like 0.8mm to thicker boards over 2.4mm, depending on your needs.

Q2: What are the benefits of a 1.2mm PCB?

A 1.2mm PCB offers space-saving advantages, making it ideal for compact devices like smartphones and wearables. It also tends to be lighter.

Q3: Will a 1.2mm PCB be more flexible?

Yes, thinner PCBs are more flexible, which may be useful in specific applications where slight bending is acceptable.

Q4: Why is thermal management important in PCB design?

Proper thermal management prevents overheating and ensures the long-term reliability of the PCB, especially in high-power applications.

Q5: What is the standard thickness tolerance for a PCB?

The standard tolerance is usually around ±0.10mm, but this can vary depending on the manufacturer and board specifications.

Tags: ,
Posted in best pcb, bestpcb, FAQ | No Comments »

What is Pour Board? What is Copper Pour in PCB?

9 9 月, 2024

What is Copper Pour in PCB Design?

Copper pour, also known as copper coating, refers to filled solid copper on PCB where without trace layout area or idle space. Instead of leaving unused areas bare, copper is poured over them, connecting it to the ground or other designated signals. The main purpose of this process is to reduce the ground impedance, improve the anti-interference ability, reduce the voltage drop. Thereby improving the power supply efficiency, and connect with the ground wire to reduce the loop area. By covering large sections of the board with copper, it also minimizes signal interference and adds a layer of protection to the PCB. Copper pour are essential for designers to maintain signal integrity and reduce unwanted noise.

What is Pour Board? What is Copper Pour in PCB?

The process of copper coating is not only very important for digital circuits, because it can effectively reduce the ground impedance, which is particularly important for digital circuits with a large number of spiking pulse currents. However, for analog circuits, the ground wire loop formed by laying copper may cause electromagnetic coupling interference.

Why Use Copper Pours on Circuit Boards?

Copper pours offer several advantages that make them an essential part of circuit board design. When creating PCBs, some engineers tend to leave many copper-free areas on the board. But a high percentage of copper-free areas on the PCB can negatively affect the product, making it vulnerable to early damage, when copper pouring comes in handy.

There are some novices who think that less copper pouring means that the cost will be lower and lower, which is wrong. It is true that the plating area is small, which can save copper, but there is no way to guarantee the quality, and the appropriate amount of copper pouring can improve the quality of the product.

When the PCB board is placed in the plating tank and the appropriate current is applied, the PCB will show the physical state after dry film coverage. After passing a current, the circuit lines exposed to the outside of the dry film will be plated with copper from the plating tank. The total area of the part of the circuit exposed outside the dry film will affect the value of the current distribution during the plating process, if the bare copper area is large, the current input is uniform, and the current received is more uniform. Therefore, a large area of copper plane must be laid in the design to prevent this from happening. If the total plating area of copper is too small or the pattern distribution is very uneven, the received current will not be uniform. In this way, when powered on, the greater the current, the thicker the copper plating layer (so designed, if only 1OZ is required, then the finished copper thickness can reach 2OZ).

What is Pour Board? What is Copper Pour in PCB?

If the gap between current traces is too small, for example about 3mil to 3.5mil, a “clip film” will form between the traces. In other words, the dry film is caught in the middle of the gap, which causes the subsequent base to start the copper in the middle, which can lead to a short circuit if the etching process is not cleaned. In order to maintain the high quality of PCB manufacturing, independent lines must be avoided as much as possible in PCB design and layout. In addition, it is recommended to use a large amount of copper on the entire PCB, if there is a separate line that cannot be covered with copper, then the continuation between the lines must be as wide as possible.

Advantages of Copper Pour Board

1. For EMC (electromagnetic compatibility) requirements, a large area of ground or power supply needs to be covered with copper, which will play a shielding role. For some special area, such as protective ground, it plays a protective role.

    What is Pour Board? What is Copper Pour in PCB?

    2. From PCB manufacturing perspective, generally in order to ensure an uniform copper plating, or avoid lamination deformation and bending, manufacturers always pour copper for those less trace layout PCB board.

    What is Pour Board? What is Copper Pour in PCB?

    3. For signal integrity PCB, pour copper gives the high-frequency digital signal a complete return path, and reduce the wiring of the DC network. In another way, pour copper can help to heat dissipation.

    What is Pour Board? What is Copper Pour in PCB?

    Disadvantages of Copper Pour

    1. If the pins of the components are fully covered with copper, the heat dissipation may be too fast, resulting in difficulties in dismantling and repairing the components. Therefore, sometimes in order to avoid this situation, cross connections are used for components (pin contact and pad contact are shown in “+”).

      What is Pour Board? What is Copper Pour in PCB?

      2. Pouring copper in the area around the antenna is easy to cause weak signal, interfered acquisition signal, and the impedance of copper will affect the performance of the amplifier circuit. So the area around the antenna section is usually not covered with copper.

      What is Pour Board? What is Copper Pour in PCB?

      Copper Pour vs Ground Plane

      There’s often confusion between copper pours and ground planes. While both serve similar purposes, they are not the same. A ground plane is a layer dedicated entirely to the ground signal, covering the entire surface of a board layer. It ensures a low-impedance path for electrical signals, minimizing interference.

      Copper pours, on the other hand, are not necessarily tied to the ground. Designers can connect copper pours to any net, including power lines or signal traces. The primary goal of a copper pour is to fill in empty spaces, whereas a ground plane is dedicated exclusively to providing a ground connection.

      Implementation of PCB Copper Pours

      When designing a PCB with copper pours, a few best practices help in optimizing its performance. Here are some useful tips:

      • Assign Copper Pours to Ground First

      When designing, prioritize assigning continuous copper to ground layers over power planes. A solid ground plane improves overall performance, providing a reliable reference for signals and reducing noise. Every PCB should have strong, consistent ground connections.

      • Monitor Trace Currents

      Although reducing inductance is advantageous, flooding the board with copper can sometimes interfere with circuit tuning. Be mindful of traced paths, especially in high-current areas, to maintain proper load control.

      • Maintain Symmetry in Copper Pours

      Ensure copper pours are symmetrical on both sides of the PCB. This balance helps prevent issues like board warping due to uneven expansion or moisture absorption. Symmetrical copper distribution is essential for the board’s structural integrity.

      • Avoid Acute Angles

      Keep copper pours free from long, narrow protrusions or angles sharper than 45 degrees. Such shapes can become weak points, breaking off or acting as antennas during vibration or shock, potentially causing functional failures.

      • Incorporate Relief Features

      Adding slots, anti-pads, and thermal spokes can relieve stress caused by material expansion, especially for large copper pours used on power planes. These features ensure mechanical stability and ease soldering.

      • Carefully Review Design Masks

      Automated copper pour shapes may need manual adjustments to remove artifacts or undesirable patterns around complex components. Always review and fine-tune these masks to achieve optimal results.

      When copper pours are correctly connected to appropriate nets, designers can enhance both the electrical and physical properties of the circuit by distributing copper strategically across the board.

      Copper Pour Clearances and Settings

      When designing a PCB with copper pours, clearances and settings play a crucial role in ensuring proper functionality and avoiding issues like short circuits. Here are PCB copper pour suggestions based on standard PCB board: 

      1. Trace to Copper Pour Clearance

      • Standard clearance: 0.2 mm (200 µm) or 8 mils
      • High-voltage applications: 1 mm (1000 µm) or 40 mils (or more, depending on voltage levels)

      2. Pad to Copper Pour Clearance

      • SMD pads: 0.2 mm to 0.3 mm (8-12 mils)
      • Through-hole pads: 0.3 mm to 0.5 mm (12-20 mils)

      You can adjust these values based on the pad size and the net to which the copper pour is connected.

      3. Copper Pour Width and Thickness

      The width and thickness of the copper pour should be chosen based on the current-carrying capacity of the board:

      • Minimum width: 1.5 mm (60 mils) for low-current signals
      • Power lines: At least 2-3 mm (80-120 mils), depending on current
      • Copper thickness: 35 µm (1 oz/ft²) is standard, but for higher currents, you can use thicker copper like 70 µm (2 oz/ft²) or more.

      4. Via Clearance in Copper Pours

      • Standard via clearance: 0.2 mm (8 mils)
      • High-current via clearance: 0.5 mm (20 mils)

      Clearance should be adapted to the board’s layer stack-up and current needs.

      5. Thermal Relief Spokes

      • Spoke width: 0.3 mm to 0.5 mm (12-20 mils)
      • Spoke count: Typically 4 thermal relief spokes per pad
      • Clearance to pad center: 0.5 mm (20 mils)

      6. Copper Pour to Board Edge Clearance

      • Standard clearance: 0.5 mm (20 mils) from the board edge
      • High-voltage boards: 1 mm (40 mils) or more

      Layer Placement of Copper Pours

      Copper pours can be placed on any layer of a PCB. In multi-layer PCBs, copper pours are often added on internal layers to maximize performance. For example, ground and power pours are frequently found on internal layers to reduce noise and improve thermal dissipation.

      On outer layers, copper pours serve to enhance thermal management. They distribute heat from high-power components and help maintain an even temperature across the board. It’s important to balance the placement of copper pours with other components to ensure overall board stability and functionality.

      What is Pour Board? What is Copper Pour in PCB?

      Copper Pour PCB Design Considerations

      1. The open areas in the design must be minimized and the open Spaces filled with copper.

      2. It’s important to assess the current-carrying capacity. Make sure the copper pour is thick enough to handle the expected current loads, especially in power applications.

      3. If there is no room for the copper, the two wires, the two pads, and the distance between the wires and the pads are designed to be 2 ounces thick with a minimum spacing of 8 mil.

      4. When pouring copper, keep a certain distance from the ordinary touch pad. The distance between the track, the common plane and the drilled area should be greater than 0.5 mm. The copper must be poured as firmly as possible. Avoid pouring copper on small grids.

      5. The inner layer of the gold finger must be all poured copper to avoid thinning of the board at the gold finger. Avoid choosing laminated structures with thin plates.

      6. Those thin long, poorly grounded ground copper will have an antenna effect, which will cause poor EMC problems. Therefore, we should try to avoid causing broken copper when coating copper, such as causing broken copper can be removed.

      7. Isolated (dead zone) copper problem, isolated copper if relatively small equivalent to broken copper can be deleted. If it is large, it can be defined as a place to add through the hole treatment, at this time there is no isolated copper.

      8. Refer to the product design manual and apply copper coating near the antenna. Any interference or interference with the antenna must be avoided when pouring fake copper.

      Tags: , ,
      Posted in best pcb, bestpcb, FAQ, FR4 PCB, Special PCB | No Comments »

      PCB Assembly manufacturer High Quality & Fast Delivery

      9 9 月, 2024

      What is pcba?

      PCBA is the abbreviation of Printed Circuit Board Assembly, which means “circuit board assembly” or “circuit board assembly”. ‌It refers to installing electronic components on a printed circuit board and connecting the components to the circuit board through welding and other methods to form a complete circuit system.

      pcba
      pcba
      pcba
      pcba

      This process involves multiple important links, including SMT (surface mount technology) mounting, DIP (dual in-line package) plug-in, etc., which eventually form a key component of electronic products. PCBA is not only the physical support of electronic equipment, but also provides a way to connect circuits, and also plays a role in protecting components and dissipating heat. In the manufacturing process of electronic products, the production process of PCBA includes steps such as PCB design, manufacturing, component placement, welding and testing to ensure the functionality and reliability of the product.

      What does pcba stand for in electronics

      PCBA stands for Printed Circuit Board Assembly in electronic products‌. PCBA is the process of assembling and soldering electronic components on a printed circuit board to form a complete circuit board. It is an important part of modern electronic products, including mobile phones, computers, cars, home appliances, etc.

      . PCBA processing involves several important links, such as SMT (surface mount technology) and DIP (dual in-line package) plug-ins, which ensure the correct placement of electronic components and the reliability of the circuit. In addition, the use of PCBA processing equipment and the improvement of manufacturing processes, such as printers and dispensing machines, have improved the yield and efficiency of PCBA processing products‌

      What is pcba manufacturing

      The manufacturing process of PCB (printed circuit board) involves multiple process links, including design, plate making, drilling, filling, electroplating, etc. These steps together constitute the manufacturing process of PCB.

      1. Design: First, according to the needs and layout design of the circuit, the circuit diagram is drawn using computer-aided design (CAD) software. This stage is very critical because it directly determines the function and performance of the PCB.
      2. Plate making: After the design is completed, the designed circuit diagram needs to be converted into a practical PCB board that can be made. This usually involves the use of photosensitive materials and special chemical treatments so that the circuit pattern can be accurately transferred to the PCB substrate.
      3. Drilling: After the plate making is completed, holes need to be drilled on the substrate according to the designed circuit pattern. These holes are used for subsequent wiring connections. The precision and accuracy of drilling are essential to ensure the normal operation of the circuit.
      4. Filling: After drilling, some substances, such as resin, need to be filled in the hole to enhance the structural strength and electrical insulation performance of the PCB.
      5. ‌Electroplated‌: In order to ensure good electrical connection, the PCB needs to be electroplated, usually by electroplating a layer of copper or other conductive materials on the copper foil. This step is very important to ensure the conductivity and durability of the circuit.
      6. ‌Lamination and cutting‌: After the electroplating is completed, the multi-layer circuit boards are laminated together to form a multi-layer PCB. Subsequently, the PCB boards are cut into specific sizes as needed.
      7. Inspection and testing‌: The manufactured PCB is inspected and tested to ensure that its functions and performance meet the design requirements. This may include visual inspection, functional testing and other methods.
      8. ‌Finished product assembly‌: The qualified PCBA board is assembled into the shell

      ‌What is the SMT process in PCBA?

      ‌1. Programming and adjusting the SMT machine‌: According to the information provided by the customer, program the coordinates of the location of the SMT components and perform the first piece check.

      2. Printing solder paste‌: Use a screen printer to print the solder paste on the pads on the PCB board where the electronic components need to be soldered.

      3. SPI inspection‌: Use a solder paste detector to detect the quality of solder paste printing to ensure that there are no defects.

      4. SMT‌: Use a SMT machine to accurately install the electronic components SMD to the fixed position of the PCB.

      ‌5. High-temperature solder paste melting‌: The solder paste is melted at high temperature through a reflow oven to firmly solder the electronic components SMD and the PCB board together.

      6. AOI inspection‌: Use an automatic optical inspection instrument to detect whether the PCBA components after welding have poor welding.

      7. Visual inspection‌: Manual inspection checks the version of the PCBA, whether the direction of the components is correct, and the defects after welding.

      8. Packaging‌: The qualified products are separated and packaged. The packaging materials used include anti-static bubble bags, static cotton, blister trays, etc.

      PCB Assembly manufacturer High Quality & Fast Delivery

      Best Technology is a PCB assembly manufacturer in Asia, who specializes in printed circuit board assembly (PCBA) and manufacturing. We have our own PCBA factory with 8 SMT lines, each line equipped with full-automated manufacturing and testing machine. In our PCBA factory, you can see dual-online AOI, SPI, X-RAY, nitrogen reflow oevn and so on. We are certified by ISO9001, ISO13485, and IATF16949, ensuring the highest quality standards in every PCB project.

      Full turnkey service from pcb design, pcb manufacturing, component sourcing, pcb assembly, pcb duplicating in a very short time.

      We source all the parts directly from the manufacturers or from authorized distributors such as Digikey, Mouser,Future,TTI,Avnet and Arrow to avoid counterfeit parts.

      We also warehouse a significant inventory of common parts.If we cannot source a specific component, our engineers will make recommendations for fair-price alternatives.

      What is pcba test

      ‌‌PCBA testing‌ is the process of testing the electrical conductivity and input-output values ​​of the PCBA circuit board with mounted electronic components to ensure that all the installed circuit boards are completely consistent with the various specifications and parameters of the design. Through strict testing, the performance and reliability of the PCBA board can be improved, customer trust can be won, and cooperation between enterprises and customers can be promoted.

      PCBA testing includes various test forms, such as ICT testing (internal circuit testing), FCT testing (functional testing), fatigue testing, extreme environment testing and aging testing.
      ICT testing tests the characteristics of devices and circuit networks by applying test probes to the test points on the PCB.

      FCT testing is mainly used to test the electronic and electrical functional aspects of the PCBA board, and is tested under the condition of simulating the actual operating state of the PCBA board. Fatigue testing performs high-frequency and long-term operations by sampling to observe whether failures occur.

      Extreme environment testing places the PCBA board in harsh and extreme environments, such as high temperature, severe cold, and falling, to infer the reliability of the PCBA board. Aging testing is to power on the PCBA board and electronic products for a long time to observe whether any failures occur.

      pcba
      pcba

      What is a pcba number

      A combination of letters and numbers used to uniquely identify and track each electronic component on a circuit board. These numbers are often called component numbers, part numbers, or reference designators.

      On PCBA boards, the format and meaning of these numbers may vary depending on the manufacturer and designer, but generally follow certain rules.

      For example, common numbers are R107, C118, Q102, D202, etc., where:
      The first letter usually identifies the type of device, such as: R for resistors, C for capacitors, D for diodes, Q for transistors, etc.
      The subsequent digital part may indicate the circuit function number (such as “1” may indicate the motherboard circuit, “2” may indicate the power supply circuit, etc.) and the serial number of the device on the circuit board.

      FAQ About PCBA

      hat does poor welding include and what kind of faults will it cause?
      Poor welding is manifested as incomplete solder joints, cold solder joints, etc., which lead to reduced conductivity of the circuit board or circuit failure. Solutions include optimizing soldering parameters, ensuring pad cleanliness, adjusting soldering energy, and increasing soldering temperature or extending soldering time.

      What causes component misalignment?
      It is caused by inaccurate positioning of components during the soldering process, affecting circuit connection and product function. Solutions include implementing precise visual inspection and automatic inspection to ensure that components are placed correctly and rework and repair.

      What do short circuits and open circuits mean?
      Short circuits and open circuits: caused by poor insulation or fracture between adjacent solder joints on the circuit board or between solder joints and lines, which may cause abnormal current flow or circuit interruption. Solutions include ensuring that solder paste is evenly applied, components are correctly placed, and adjusting soldering parameters to avoid excessive soldering temperature and pressure.

      What causes solder cracking?
      Solder cracking: cracking occurs during use or after a certain environmental stress, usually due to excessively high temperatures, long soldering time, or improper selection of soldering materials during the soldering process. Solutions include optimizing soldering parameters, ensuring proper soldering temperature and time, and selecting appropriate soldering materials.

      Why electrostatic discharge?
      ‌Electrostatic discharge (ESD) damage: Sensitive electronic components can be damaged by ESD. Solutions include implementing ESD control measures in the production environment, such as using ESD gloves and anti-static workbenches.
      Does voltage instability affect PCBA performance?
      ‌Power supply issues: Power supply stability issues can affect PCBA performance. Solutions include implementing power electronics technology and voltage regulators to ensure stable power supply.

      what does pcba stand for

      PCBA stands for Printed Circuit Board Assembly. Other synonyms of PCBA include “PCB Assembly”, “Populated PCB” and “Board Assembly”. These terms are widely used in the electronics industry to describe the finished or semi-finished state of a circuit board after component placement and soldering.‌

      what is a pcba board

      PCBA board, full name Printed Circuit Board Assembly, Chinese name is printed circuit board assembly, refers to the installation and welding of components on the completed printed circuit board to form a circuit board that can be used directly.

      The production process of PCBA board mainly includes three steps: component mounting, welding and testing. First, the obtained components are accurately positioned and mounted on the PCB board according to the design requirements, and then the components are firmly fixed on the PCB board by welding, and the circuit is ensured to be unobstructed. Finally, the circuit is tested to verify whether it is working properly. The whole process requires a high degree of technology and precision to ensure the quality of PCBA board.

      Tags: ,
      Posted in best pcb, FAQ, PCB Technology, PCBA, Uncategorized | No Comments »

      « Older Entries
      Newer Entries »