Bus Bar PCB: What are the Considerations During Designing?

June 8th, 2024

In the electronics industry especially for new-energy vehicles, a Bus Bar PCB plays an important role to achieve specific function. It transmits large amounts of current through metal strips or conductive paths, making it ideal for high-power applications. The design of busbar PCBs is a key technical area for designers or engineers who engaged in power distribution or who require efficient current management. In this article, we would like to share some information about the considerations during a bus bar circuit board designing, hope this may help you to design a desired PCB successfully.

What is a Bus Bar PCB?

Bus bar PCB is one of a new type of heavy copper PCB and it was made by FR4 fiber glass material and laminated with metal alloys. It transmits electrical energy from one point to multiple output points through integrated conductive paths, which are typically made of copper or aluminum. Busbar PCBs are designed to reduce resistance and inductance, thereby maximizing current transfer efficiency and minimizing energy loss.

Generally, if it is used in a charging pile product, there are generally at least 2 busbar circuit boards, one is the main control board (a larger one), and the other is a smaller board, both of two need to use the bus bar process.

Bus bar PCB is widely used in power distribution systems, electric vehicles, industrial equipment and other occasions requiring high current. They are designed to simplify system wiring, reduce electromagnetic interference (EMI), and improve overall reliability and performance of the product.

Why is High Current Bus Bar PCB Important?

Bus bar PCB has irreplaceable advantages in current transmission and power distribution. They mainly feature three functions when used in electronics. First of all, they are able to efficiently handle large currents without generating excessive heat. This is what standard FR4 PCB cannot achieved. Secondly, bus bar PCB has ability to significantly reduce the complexity of the circuit layout design. By integrating the current transfer path, they can reduce the number and length of circuits required by the system, thereby simplifying system design and reducing potential failures.

In addition, bus bar PCB helps reduce electromagnetic interference. Due to the design optimization of the conductive path, the noise generated during current transmission can be effectively suppressed. This characteristic makes it perform well in high-noise environments, ensuring the stability and reliability of electronic devices.

What Should We Consider When Designing A Bus Bar PCB?

Due to it is a new innovation in the industry, it is a not a simple thing to design a bus bar circuit board successfully. It’s a complex task that requires consideration of several technical factors to ensure its effectiveness and reliability. The following are the main aspects to focus on when designing a bus bar PCB.

Copper Thickness

The first important thing is what’s the copper thickness of busbar you want to. You must know, thicker copper allows for higher current carrying capacity, but not thicker thickness is better, it should be calculated according to the voltage and current it will used in.

Current capacity and temperature management

The bus bar PCB should be designed to carry the maximum expected current while keeping the temperature within a safe range. This is usually achieved by selecting the appropriate conductor material and optimizing the cross-sectional area of the conductor. For example, for 100A current requirements, a typical design would use copper strips with a thickness of 5mm to ensure that the temperature rise does not exceed 20C.

Resistance and inductance

Low resistance and low inductance are key to bus bar PCB design. The shape, thickness and layout of conductors should reduce resistance and inductance as much as possible to improve the efficiency of current transmission. For example, the use of trapezoidal or flat conductors can effectively reduce inductance, thereby improving current transmission performance.

Electromagnetic compatibility (EMC)

Bus bar PCB design also needs to consider electromagnetic compatibility issues to ensure that it does not produce too much electromagnetic interference (EMI), while being able to resist external electromagnetic interference. By optimizing the conductor layout and using shielding materials, the electromagnetic compatibility of the bus PCB can be significantly improved.

Thermal management

Because bus bar PCB aims to transmit high current, thermal management is an important part of the design. The thermal design should ensure that the PCB can effectively dissipate heat and prevent overheating damage. For high power applications, radiators or active cooling are often used to ensure temperature control within design specifications.

EBest Circuit (Best Technology) Manufacturing Capability of Bus Bar PCBs

As the one of leading PCB manufacturers in China, EBest Circuit (Best Technology) has exceptional capabilities in the production of busbar PCBs. Our manufacturing capabilities include high-precision metal processing technology to produce busbar PCBs with complex geometry and tight tolerances. In addition, we also have the production capacity of multi-layer bus bar PCB to meet the needs of different applications.

EBest Circuit (Best Technology) is committed to providing customers with high-quality, high-performance busbar PCBs to support their power management and distribution systems. Below is a basic parameter of our bus bar PCB manufacturing capability. For more details, welcome to e-mail us at sales@bestpcbs.com.

(Best technology capability of bus bar pcb)

Nowadays, bus bar PCBs are widely used in power distribution systems, electric vehicles, industrial equipment and other occasions requiring high current. According to statistics, the global busbar market is expected to grow at a compound annual growth rate (CAGR) of 6.5% between 2023 and 2028, demonstrating the growing importance of this technology in multiple industries.

With the rapid development of the eras, the most important thing for designers or buyers is to find a reliable bus bar PCB manufacturer to meet the high demands of the market. As the expert of the bus bar PCB fabricating, EBest Circuit (Best Technology) has the mature technology and advanced equipment to produce high quality bus bar PCBs. Contact us right now to get your own bus bar PCB solutions!

Tags: Bus Bar PCB, Busbar PCB
Posted in best pcb, bestpcb, Design Guide, FAQ, PCB News, PCB Technology, Special PCB | No Comments »

Why is FR4 Material the Most Commonly Used PCB Material?

June 5th, 2024

FR4 material is a highly popular and widely used substrate in the PCB industry due to its exceptional mechanical strength, electrical insulation, and flame retardant properties. It has become the standard for PCB fabrication.

What is FR4 Material and Why is it Used in PCBs?

FR4 is a type of fiberglass-reinforced epoxy laminate. The term “FR4” comes from its flame-retardant properties, meeting the UL94V-0 standard. It is made from woven fiberglass cloth and epoxy resin, which together provide great strength and durability.

Electrical engineers and designers prefer FR4 because of its many benefits, such as:

Low cost
High dielectric strength
Excellent strength-to-weight ratio
Moisture resistance
Temperature endurance
Good electric loss characteristics
Flame retardance and self-extinguishing capabilities
Mechanical robustness
Insulating properties

FR4 is also suitable for marine PCBs because it absorbs very little water. In a standard FR4 PCB, a layer of FR4 is placed between two thin layers of laminated copper.

What are the Key Performances of FR4 Material?

FR4 material, also recognized as flame retardant 4, is a composite of glass fabric and epoxy resin, predominantly utilized as a foundational material for printed circuit boards. Familiarity with the specifications of FR4 is crucial for selecting the appropriate substrate for PCB manufacturing. Key specifications include:

1. The thickness of FR4 sheet is usually 0.2 mm to 3.2 mm, and other special thickness also available.

2. The specific gravity of FR4 material is about 1.85g/cm³, which means that it is heavier than water.

3. Coefficient of thermal expansion of FR4 is about 1.0×10^-5cm/cm/℃, which means that its length or width will expand slightly when the temperature changes.

4. The thermal decomposition temperature of FR4 materials is usually between 280C and 320C, which makes it able to withstand high temperature applications.

5. FR4 material has a dielectric constant around 4.0-4.8, which makes it an ideal material for circuit board manufacturing.

6. FR4 has good arc resistance, which means that in the case of high voltage, it can effectively prevent arc discharge.

7. FR4 material good hydrolysis resistance and can maintain good performance even in a humid environment.

What are the Types of PCB Materials in the Industry?

PCB materials can be broadly categorized based on their composition and intended application. Nowadays, the commonly used are including FR4, polyimide (PI), Metal material (copper or aluminum), ceramic substrate like Al2O3, AlN, Si3N4, and so on. Different materials have its unique functions and well-suited in specific environment. Here we introduce their properties and suited applications simply.

FR4 (Fiberglass Epoxy Laminate)

At present, almost of PCB you seen in the market or electronics used the FR4 material. It widely used because of its superb equilibrium of mechanical strength, electrical insulation, and cost-efficiency. Actually, according to the different reinforcement materials, the circuit board is mainly classified into the following types:

1) FR-4

2) FR-1, FR-2, etc.

3) CEM series: Composite substrate

FR-4 used frequently because of its high fire resistance rating.

High Tg FR4

Though normal FR4 material has good electrical insulation, it is not an ideal option for high frequency circuit board. And then, high Tg FR4 stands out by using an advanced technology. “Tg” refers to glass transition temperature, the juncture at which the material transitions from a rigid, glassy state to a pliable, rubbery state. High Tg FR4 boasts a Tg of 170°C or higher.

Polyimide (PI)

Polyimide materials are renowned for their excellent flexibility, superior thermal stability and chemical resistance. It is always used as raw material of flex circuits, rigid flex circuit boards or membrane switches. Due to the good chemistry properties, they can endure temperatures up to 260°C and are highly flexible, making them ideal for those small and limited PCB designs.

Metal base material

Metal materials always used in metal core PCBs (MCPCB), usually used aluminum core or copper core. The metal base has great thermal conductivity to enhance the thermal management of the device, buy using metal core, the device can dissipate heat away from the critical component such as LED chips, ICs, BGAs, to remain the reliability and performance of the PCB.

Ceramic substrate

Ceramic PCB substrate offers excellent thermal conductivity and stability than that metal core PCBs, making them suitable for high-power and high-frequency applications. But due to the high cost and complex manufacturing, the ceramic PCB is much expensive than metal core PCB, therefore, they are always be used in high-end applications, such as the military, defense, aerospace and some special fields where requires excellent thermal management.

Understanding these materials enable to help engineers and designers in selecting the most appropriate substrate for their projects, ensuring optimal performance and cost-efficiency. EBest Circuit (Best Technology) provides a comprehensive array of PCB materials, guaranteeing high-quality solutions for all your electronic needs.

What are the Applications of FR4 PCB Material in Various Industries?

FR4 material is versatile and finds applications in numerous industries, including:

Consumer Electronics like smartphones, laptops, and other personal electronic devices.
Applied in vehicle electronics for infotainment systems, engine control units, and more.
Industrial Equipment such as control systems, power supplies, and industrial automation.
Essential for telecommunications, network devices, routers, and communication infrastructure.
Medical instrumentation and diagnostic equipment.
Aerospace and defense in avionics, radar systems, and defense electronics.

This is all of this sharing, thanks for your reading. Welcome to contact us if you have other questions about FR4 or other raw materials of PCB. EBest Circuit (Best Technology) engaging in the PCB manufacturing about 18 years, we are one of the leading PCB manufacturers in China. And we have such confidence to provide with you the best PCB and PCBA fast solution for your projects.

Posted in best pcb, bestpcb, FAQ, FR4 PCB, mcpcb, Metal Core PCB, PCB News, PCB Technology, PCBA, Rigid Flex Circuit, Special PCB | No Comments »

What are HDI PCBs and Their Basic Parameters?

June 5th, 2024

High-Density Interconnect (HDI) PCBs are revolutionizing the electronics industry with their advanced capabilities and compact designs. As technology continues to evolve, the demand for smaller, faster, and more efficient electronic devices has led to the widespread adoption of HDI PCBs.

What is Definition of HDI PCB?

HDI board refers to High Density Interconnect, that is, high density interconnect board, which is a relatively new technology developed by the PCB industry at the end of the 20th century.

The drilling of the traditional PCB board is affected by the drilling tool, and when the drilling aperture reaches 0.15mm, the cost is already very high, and it is difficult to improve again. The drilling of HDI board no longer relies on traditional mechanical drilling, but uses laser drilling technology. (This is why it is sometimes called a laser plate.) The hole diameter of the HDI board is generally 3-5mil (0.076-0.127mm), the line width is generally 3-4mil(0.076-0.10mm), the size of the pad can be greatly reduced, so more line distribution can be obtained within the unit area, and the high-density interconnection comes from this.

Smaller device spacing, more I/O pins and embedded passive devices Larger ASiCs and FPGAs with increasingly shorter rise times and higher frequencies all require smaller PCB feature sizes, which is driving a strong demand for HDI/ micro through-holes. The typical high density interconnector designs are including:

1+N+1
2+N+2
3+N+3
4+N+4

What are the benefits of HDI PCB?

HDI is a compact circuit board designed for small volume users. Compared with ordinary FR4 PCB, the most significant feature of HDI is the high wiring density, and the difference between the two is mainly reflected in the following three aspects.

1. HDI is smaller and lighter

HDI board is a traditional dual panel as the core board, through continuous stacking layer by layer. This kind of circuit board made by continuous layering is also called Build-up Multilayer (BUM). Compared with traditional circuit boards, HDI circuit boards have the advantages of “light, thin, short and small”.

The electrical interconnection between the HDI board is realized through the conductive through hole, buried hole and blind hole connection, its structure is different from the common multi-layer circuit board, and a large number of micro-buried blind holes are used in HDI board. HDI uses direct laser drilling, while standard PCBS usually use mechanical drilling, so the number of layers and aspect ratio tend to be reduced.

The high density of HDI board is mainly reflected in the hole, line, pad density, and layer thickness.

● Micro-via hole

The HDI board contains the design of micro-pilot holes such as blind holes, which is mainly reflected in the micro-hole formation technology with a diameter less than 150um, and the high requirements of cost, production efficiency and hole position precision control. In the traditional multilayer circuit board, there are only through holes and no tiny buried blind holes.

● Fine line width and line distance

Its main performance in the wire defects and wire surface roughness requirements are more and more stringent. Generally, the line width and line distance do not exceed 76.2um.

● High pad density

The density of welded contacts is greater than 50 per square centimeter.

● Thinning of medium thickness

It is mainly manifested in the trend of the thickness of the interlayer medium to 80um and below, and the thickness uniformity requirements are becoming more and more stringent, especially for high-density plates and packaging substrates with characteristic impedance control.

2. Better electrical performance

HDI not only enables end-product designs to be miniaturized, but also to meet higher standards of electronic performance and efficiency at the same time.

The increased interconnect density of HDI allows for increased signal strength and improved reliability. In addition, the HDI board has better improvement for RF interference, electromagnetic wave interference, electrostatic discharge, heat conduction and so on. HDI also uses full digital signal process control (DSP) technology and a number of patented technologies, with a full range of load adaptability and strong short-term overload capability.

3. The HDI board has very high requirements for buried holes

It can be seen from the above that whether it is the volume of the board, or the electrical performance, HDI is better than ordinary PCB. Where the coin has two sides, the other side of HDI is as a high-end PCB manufacturing, its manufacturing threshold and process difficulty are much higher than ordinary PCB, and there are more problems to pay attention to when producing – especially the buried hole jack.

What are the basic parameters of HDI PCB?

HDI PCB has greater different with normal FR4 PCB, from the stack up, material selection, manufacturing and cost. So, it is vital to understanding the basic parameters of a high-density interconnect board before start your designing trip. The standard parameters of HDI board mainly include the following aspects:

Numbers of layers

Generally, the number of layers of HDI board is 4-20 layers, and the high-end HDI board can reach to 40-50 layers.

Line width/spacing

Due to the HDI PCB are always used in high-end applications, their line width and spacing are usually very strict, and the common requirement is that the line width/spacing is 4/4mil (0.1mm), or even smaller.

Blind hole, buried hole, bus

These are one of the characteristics of the HDI board, blind hole and buried hole can reduce the area of the circuit board, make your design more density, and the bus enable to improve the signal transmission rate of the PCB.

Board thickness

The board thickness of HDI board is usually range from 0.8 to 3.2mm, of which 1.6mm is the most common thickness.

The pad on the HDI board is generally very small, and the common pad size is 0.2mm to 0.5mm. Different factory has different capabilities, it is best to ask your supplier or manufacturer to get a manufacturing capability document.

Impedance control

For high-speed signal transmission circuits, the impedance control of the HDI board is very important, and the requirements are very strict. It is needed to tell your vendor if your HDI board will be used in high-speed devices.

Material

The main materials of HDI board are FR4, BT, PI, PET, etc. Different materials can meet different requirements.

This is the end of this sharing, contact us today to learn more about our HDI PCB solutions and how we can help you achieve your technological goals. In our next chapter, we will introduce the manufacturing process and methods of HDI boards, let me know if you are interested in it.

Posted in best pcb, bestpcb, Design Guide, FAQ, FR4 PCB, HDI PCB, PCB News, PCB Technology, Special PCB | No Comments »

What Should We Consider When Designing A High Power PCB?

June 1st, 2024

With the continuous growth of new energy demand and the transformation of energy structure, the market size of high-power technology continues to expand. The high power pcb includes heavy copper pcb, bus bar pcb. As an important part of the battery module in the energy storage system, the high power PCB plays a key role in the safety and performance of the entire system. This article explores key considerations when designing high power PCBs, providing insights to help you optimize your designs for demanding applications.

How Important is Thermal Management in High Power PCB Design?

Thermal management is crucial in high power PCB design to prevent overheating and ensure reliable operation. High power components generate significant heat, which can damage the PCB and reduce its lifespan if not managed effectively. Here are some key strategies:

Use thicker copper layers to improve thermal conductivity as much as possible. For example, a 2 oz/ft² copper layer can carry approximately 10 amps of current.
Thermal Vias are important elements in the complex designs, they serve as the heat dissipation paths to conduct heat away from high power components.
Select appropriate heat sinks based on the power dissipation requirements. For instance, a heat sink with a thermal resistance of 1°C/W can handle 50W of power dissipation with a 50°C temperature rise.

How to Optimize Power Distribution in High Power PCBs?

Normally, high power PCBs are featuring in thick copper thickness, wider trace space and distance, less or no BGA or fine pitch components. And because of the operation of high current, the circuit board is more likely to have the problem of heating, so the high-power PCB always do some heat treatment to avoid overheating, such as design dissipation via holes or adding some heat sinks. Anyway, effective power distribution is essential to ensure stable operation and prevent voltage drops in high power PCBs. Here we summarize some tips to optimize the power distribution when designing a high-power PCB.

High-Performance Materials

Choose materials suitable for high current applications like FR-4, metal substrates, or composite materials. These materials have lower resistance, higher thermal conductivity, and better mechanical strength to handle high currents and heat concentration.

Current Distribution Balance

Implement balanced current distribution by adding current balancers, balancing resistors, or current balance layers. This reduces the resistance and hot spots, enhancing reliability and stability.

Avoid Cross-Talk Between Power and Signal Traces

Keep high current paths separate from digital signal paths to minimize interference. This reduces electromagnetic interference (EMI) and improves overall performance.

Solid Copper Pour for High Current Paths

Use solid copper pours for high current paths. This increases current-carrying capacity, improves heat dissipation, and minimizes voltage drops.

Thermal Management for Power Paths

Use large copper areas, vias, and exposed copper to enhance heat dissipation. Proper thermal management prevents component and product damage due to overheating.

EMC Radiation Control

Use wider trace widths, larger hole diameters, and increased spacing to manage EMC radiation. Keep high current paths short and place them away from sensitive components.

Why is Copper Thickness Critical in High Power PCB Design?

Copper thickness plays a vital role in determining the current-carrying capacity and thermal performance of high power PCBs. Here are some data points:

Standard Thickness: For high power applications, copper thickness typically ranges from 2 oz/ft² to 6 oz/ft².

Current Capacity: A 2 oz/ft² copper layer can handle approximately 10 amps, while a 6 oz/ft² layer can carry up to 30 amps.

Thermal Performance: Thicker copper layers improve heat dissipation, reducing the risk of overheating.

How Does PCB Layout Affect Signal Integrity in High Power Designs?

PCB layout is a critical factor that influences signal integrity and overall performance in high power designs. Consider these points:

Trace Length: Minimize the length of high-speed signal traces to reduce signal loss.

Consistent Trace Widths: Maintain consistent trace widths to ensure uniform current distribution.

Separation of Power and Ground Planes: Reduces noise and crosstalk.

Differential Pairs: Use differential pairs for high-speed signals to enhance signal integrity.

Adequate Spacing: Ensure adequate spacing between traces to prevent interference.

Designing a high power PCB requires a comprehensive understanding of various factors, including thermal management, material selection, power distribution, copper thickness, and PCB layout. By addressing these considerations, you can optimize your PCB designs for high power applications, ensuring reliability and performance. At EBest Circuit (Best Technology), we specialize in high power PCB solutions tailored to meet your specific needs. Our expertise and commitment to quality make us the ideal partner for your high power PCB projects. Choose EBest Circuit (Best Technology) for unparalleled performance and reliability in your PCB designs.

Tags: Bus Bar PCB, heavy copper pcb, high power pcb
Posted in best pcb, bestpcb, Design Guide, FAQ, PCB News, PCB Technology | No Comments »

What is the Flexible Aluminum PCB?

May 29th, 2024

Flexible aluminum PCB is a new development in the recent years, it enables people decrease the size of certain products in some area. Different from the rigid flex PCB, flexible aluminum PCB combines the flex circuit and aluminum core circuit board (or can be copper core PCB), so it has the rigidity and good thermal management of traditional Aluminum PCBs with the flexibility of polyimide, these hybrid boards offer a host of advantages.

To increase the thermal conductivity in high power applications, and meet the flexibility requirements, flexible aluminum PCB is a good option. This article explores the key benefits of flexible Aluminum PCBs, highlighting why they are becoming increasingly popular in various applications.

What is Flexible Aluminum PCB?

Flexible aluminum PCBs are a type of printed circuit board that uses an aluminum base material and is designed to be flexible. Unlike standard aluminum PCBs, these boards can bend and conform to different shapes, making them ideal for applications where space and flexibility are crucial. And Have you ever heard about our another aluminum board that we called bendable aluminum PCB? This is a special metal core circuit board that uses special material makes the circuit board bendable while won’t damage the board. May you think both of two are the same product? No, they are different in the constructure and raw materials, and the manufacturing processes are different as well.

Bendable aluminum PCB uses aluminum alloy as the raw material, considering it must meet the bendable requirement as well as the good thermal management during using, it must be specially designed aluminum alloy composite material. And the aluminum base thickness also is a key consideration, 0.2mm to 1.0mm always are the common bending metal substrate thickness. Meanwhile, the bending radius of bendable aluminum PCB also should be calculated before manufacturing, making it follow the bending design standard to smooth the manufacturing. It is the same as flexible aluminum PCB.

What Are the Constructure of Flexible Aluminum PCB?

Flexible aluminum PCBs combine the benefits of aluminum’s excellent thermal management with the flexibility required for modern electronic designs. These PCBs are constructed using a combination of materials and layers that provide flexibility, durability, and efficient heat dissipation. And compared with original aluminum PCB, it adds the flexible insulation layer and the content of adhesive glue is different.

Aluminum base layer

The aluminum base layer serves as the foundation of the flexible aluminum PCB. It provides structural support and excellent thermal conductivity. Typically, high-quality aluminum is used for this layer due to its superior thermal properties and mechanical strength.

Dielectric layer

It acts an insulator between the aluminum base and copper foil, it can allow the heat pass through while electrically insulating the conductive pathways.

Copper foil

The copper foil forms the conductive pathways that carry electrical signals and power across the PCB. It is essential for the functioning of the electronic components connected to the PCB.

Flexible layer

Common materials for this layer include polyimide (PI) or polyester (PET), both known for their flexibility, thermal stability, and insulating properties. It contributes to the overall flexibility of the PCB, allowing it to bend and conform to various shapes.

Protective overlayer

This layer is applied over the copper circuits to protect them from environmental factors such as moisture, dust, and physical damage. It also provides mechanical support to the flexible areas. Normally called solder mask layer.

The Difference Between Flexible Aluminum PCB and Flex Circuits

While both aluminum flex PCBs and flexible printed circuits (FPCs) offer flexibility, they differ significantly in their materials and manufacturing costs:

Item	Flexible Aluminum PCB	Flex Circuit (FPC)
Base Material	Aluminum core	Polyimide or PET
Conductive Material	Copper foil and aluminum for the conductive traces	Various materials like polyimide, PET or the copper foil
Flexibility	Limited in specific area	Flexible everywhere
Thermal Conductivity	High thermal conductivity	Depends on the material used
Manufacturing Process	Complex	Relatively simple
Specific Advantage	Fast heat dissipation	General part in electronics
Cost	High	Cost-effective

(Comparison between flexible aluminum PCB and flex circuit)

What Are the Benefits of Using Flexible Aluminum PCB?

Flexible aluminum PCB has numerous advantages that make it highly preferrable for specific applications, including:

Excellent thermal management

Due to the applied of aluminum base, efficient heat dissipation prevents overheating and extends the lifespan of electronic components.

Lightweight and flexible design

Due to the flexible and lightweight features in the flex aluminum PCB, it can be bent and shaped the PCB reduces the need for additional connectors and saves space in compact designs.

Improve reliability

Aluminum based PCB has good durable, ensures the long-lasting performance of the whole product, even in harsh conditions.

High density integrated

The flexible aluminum PCB allows for the higher density circuit layouts than normal aluminum PCB.

Effective electromagnetic shielding

Aluminum material provides electromagnetic shielding in a certain degree, which helps to reduce the impact of electromagnetic interference on the circuit.

How to Choose A Reliable Flexible Aluminum PCB Manufacturer?

Selecting the right manufacturer for flexible aluminum PCBs is crucial for ensuring quality and reliability. Make sure your supplier has extensive experience in this field and obtained relevant certifications like UL, CE, ISO9001 and so on.

EBest Circuit (Best Technology) is a China-based PCB and PCBA manufacturer, who has over 17-years-experience circuit board manufacturing. At EBest Circuit (Best Technology), we specialize in providing high-quality flexible aluminum PCBs tailored to meet your specific needs. And we were certificated by ISO9001 quality control system, ISO13485 for medical device and IATF16949 for automotive system. Our expertise and commitment to excellence ensure that you receive the best solutions for your electronic applications. Choose EBest Circuit (Best Technology) for your PCB requirements and experience the benefits of advanced PCB technology.

Posted in best pcb, bestpcb, mcpcb, Metal Core PCB, PCB News, PCB Technology, Special PCB | No Comments »

What Is the Importance of Ground Plane in PCB EMC Design?

March 30th, 2024

In the design of electronic products, electromagnetic compatibility (EMC) is a crucial consideration. Particularly in the design of printed circuit boards (PCBs), the rationality of EMC design directly impacts the performance and stability of the product. Among the many factors affecting EMC, one factor is especially critical, and that is the design of the ground plane. Today, let’s talk about the impact of grounding on EMC.

In an electronic product, grounding is a very important element, it is directly related to EMC compliance. Especially in large equipment, the grounding of multiple systems and subsystems is involved. It can be said, a good grounding system means the half successfully of a product.

What are Ground Plane and EMC in a PCB?

The ground plane, as the reference potential in a circuit, not only carries the return path of current but also plays a role in electromagnetic shielding and noise suppression. In high-frequency circuits, the impedance and layout of the ground plane have a significant impact on signal integrity. Unreasonable ground plane design may result in signal interference, increased radiation, and decreased system stability.

EMC stands for Electromagnetic Compatibility. It refers to the ability of electronic devices and systems to operate properly in their intended electromagnetic environment without causing or experiencing interference. EMC ensures that devices can function without adversely affecting other devices nearby or being affected by electromagnetic interference from external sources. Generally, the ground planes will showing three shapes, please see as following:

Why A Grounding Must be Designed in PCB?

Grounding can be understood as an equipotential point or plane serving as the reference potential for a circuit or system, which can be a specific ground layer in a PCB or the metal chassis of a product. While many perceive the purpose of designing a ground plane primarily to prevent external electromagnetic interference (EMI), but in printed circuit board design, it serves multiple purposes beyond this.

Generally, a well-designed ground provides a common reference zero potential for all circuit units within a system, ensuring no potential difference between circuits and thus stable operation. It also protects circuits from damage, ensuring the safe functioning of electronic products. For instance, ground can provide discharge paths for transient disturbances and dissipate accumulated charges on product metal enclosures induced by static electricity, to prevent potential sparks that may cause interference internally. Additionally, choosing appropriate grounding for shielding structures can yield effective electromagnetic shielding.

Grounding design is very necessary especially for medical industry. As we know, there are many medical devices are directly connected to patients’ bodies, such as monitors. In cases where the chassis carries voltage due to poor grounding, fatal risks may arise. Furthermore, grounding reduces common-mode interference currents flowing through PCBs and prevents high-frequency EMI signals within products from reaching equivalent radiating antennas. Thus, grounding is typically a primary method for noise suppression and interference prevention.

Design Principles of Ground Plane in PCB

A well-designed grounding system should not only consider the radiation and conduction of individual PCBs but also prevent from a systemic perspective. In the design phase, failure to carefully consider the grounding system may indicate a high likelihood of EMC failure for the system. So, knowing the design principles is extremely important to make sure the successful of EMC.

Keep it short and wide

To reduce the impedance of circuits, especially in high-frequency circuits, the ground plane should be made as short and wide as possible. This helps to minimize the return path of the current, thereby reducing EMI.

Partition layout

For complex PCB designs like multilayer PCBs, it is recommended to use a partition layout to separate the ground planes of different functional modules. This helps to isolate noise interference between different modules.

Single-point ground and multipoint ground

Depending on the circuit’s operating frequency and signal characteristics, choose between single-point grounding or multipoint grounding. Single-point grounding is suitable for low-frequency circuits, while multipoint grounding is more suitable for high-frequency circuits.

Ground plane

Where possible, use a ground plane as the ground. The ground plane can provide a low-impedance return path and aid in electromagnetic shielding.

How to Optimize Your Grounding Design?

As for PCB that has already design the circuit layout, how to optimize the ground to get the maximum EMI? Here are some tips that may helpful for you.

Fill the blank areas of the PCB with ground planes to increase the ground plane’s area and reduce impedance.
Reducing the area of ground loops helps to decrease electromagnetic radiation and induced noise.
Power lines and ground planes should be placed as close as possible and run parallel to reduce the area of the current loop.
Placing decoupling capacitors between power and ground planes helps to filter out high-frequency noise.

In PCB EMC design, ground plane design is an essential step that cannot be ignored. By following the principles and optimization methods of ground plane design, the EMC and signal integrity of electronic products can be significantly improved. Therefore, in PCB design, sufficient attention and consideration must be given to ground plane design. Welcome to contact EBest Circuit (Best Technology) if you want to know more about ground and EMC design.

Tags: EMC, GND design, pcb design, pcb EMC
Posted in best pcb, bestpcb, Design Guide, FR4 PCB, HDI PCB, mcpcb, Metal Core PCB, PCB News, PCB Technology | No Comments »

Top 6 Considerations You Must Know About PCB Designs

March 27th, 2024

Electronics devices and parts are existing everywhere in this big data era, and more and more engineers trying to step in the electronics design and development. As a one-stop PCB and PCBA manufacturer in China, EBest Circuit (Best Technology) would like to share some basic considerations and tips during the PCB designs. Hope this can help you.

Substrate Material

Substrate is the main composition of a circuit board and it mainly used for suppler and copper foil insulation. The commonly materials are FR4 and PI. FR4 is a widely acceptable international grade for fiberglass reinforced epoxy laminated, and it always used for making rigid PCB or rigid-flex PCB. FR4 substrate has good insulation and mechanical strength, so it can be widely used in various applications. However, PI has higher heat and chemistry resistance, more suitable for high temperature and chemical corrosion environment.

Circuit Layout

The layout design depends on the dimensions, performance and reliability of a circuit board, it is needed to follow your supplier’s standard to make sure the fast production time and high quality.

Min line width

Please make sure your line width within your supplier’s manufacturing capability, that is to say, if it is less than the minimum line width will not able to be produced. The best way is if the design conditions available, the larger the line width, the better the factory production. Generally, the line width keeps around 10mil is the best. In another word, if your line width is less than normal standard, it would be difficult for you to find a suitable supplier.

Min line spacing

Min line spacing means the distance between trace and trace. Normally, from the production aspect, the distance from line to pads should not less than min line spacing, and it would be better if it is larger, generally equal to or more than 10mil.

The spacing between circuit to outline should be control in 20mil.

Plug-in Hole

The diameter of plug-in hole should be considered by the side of components, but it is necessary that it must greater than the component’s pins, it is recommended that greater at least 0.2mm. That is to say, if the pin of components is 0.6mm, then the plug-in holes should be greater than 0.8mm. Otherwise, the plug-in components would be probably difficult to insert into PCB because of the tolerance control during the manufacturing and assembly.

Min Hole Diameter

As we all know, the holes in PCB almost be used for mounting components, connect circuit and provide the electrical connection between layers. So how to design the hole also is crucial during the designing. Generally, the min hole diameter depends on the drill bitter that vendor used, always around 0.2-0.4mm. You can ask your supplier during the design evaluation.

Copper Thickness

Copper foil is a layer of metal foil on the PCB board that is used to conduct current. The thickness of copper foil is usually in oz (ounces), such as 1oz, 2oz, 3oz, etc. The thickness of the copper foil will affect the conductivity and heat dissipation performance of the PCB board.

Impendence Control

Impedance control is a key parameter in high-speed signal transmission and high-frequency circuit design. It involves board thickness, copper foil thickness, substrate dielectric constant, pad and line layout and other factors to improve the signal integrity and anti-interference ability of the PCB board.

The production process of PCBs is rather complex, involving a wide range of techniques from simple mechanical processing to sophisticated machining, so you should understand the design rules very clearly when you are trying to design a PCB board. Its applications are also diverse, from consumer electronics to industrial machinery, where PCBs are utilized.

EBest Circuit (Best Technology) offers one-stop PCB solutions, we offer service from prototyping to large-scale production and assembly. With experienced engineers and service teams, we ensure successful fulfillment of your requirements. Just send us with your design files, and we will make the circuit board for you in a very short time.

Tags: design guide, pcb design
Posted in best pcb, bestpcb, FAQ, FR4 PCB, PCB News, PCB Technology | No Comments »

Do You Know What Is PCB Stiffener Busbar?

March 27th, 2024

Busbar PCB is an electronic component, also known as a socket board or mother board, which is an important part of an electronic device and is used to connect and transmit current and signals, so it plays a crucial role in the design of electronic devices. Busbar PCB is like a PCB coated with an “ear”, which we also call it as stiffener busbar. Want to know more about it? Welcome to reading on!

What is PCB Stiffener Busbar?

A busbar circuit board is a key component used in electrical systems. It usually consists of a main conductive busbar (usually copper or aluminum) that is covered with an insulating material such as prepreg or resin. Busbar boards are used to transmit high currents in power systems, such as in industrial equipment, power distribution systems, and control panels.

These boards typically have multiple slots for inserting electrical connectors or electrical devices. The design of the bus board can be customized according to the specific application requirements to adapt to different current and voltage requirements. They are widely used in the industrial and commercial sectors because they provide reliable power transmission and connectivity solutions.

What Are Benefits of Using a Busbar PCB?

Busbar stiffener pcb serves as a crucial element of conducting electricity, especially when simplifying the power distribution process, saving costs and requiring greater flexibility. They come in a variety of sizes and different coatings, such as aluminum and copper. The material type, dimension, size and shape of the busbar determine the current capacity it can carry. Compared with a coil harness, though it is expensive in manufacturing, but has longer life and does not need to replace in a short time. Here we listing some benefits of busbar PCB:

Efficient Power Distribution

With the fast development of new energy cars and vehicles, the electronic parts in the cars also should updated to meet the demands of renewable energy powers. So the busbar PCB stands out because it can distribute the powers in devices efficiently. Meanwhile, it also can help to reducing the consumption of energy. Because of its integrated nature, it can easily adapt to the integration of renewable energy, which is quite intriguing to consider in this advanced era of energy.

High Conductivity

The busbar stiffener on a PCB is typically crafted from either copper or aluminum. Copper, renowned for its excellent conductivity, stands out as the preferred material for busbars due to its capacity to facilitate the flow of electrons. Moreover, copper’s robust nature enables it to withstand harsh environmental conditions and high temperatures, thus bolstering its longevity and durability. But if you want PCB that can carry higher conductivity, ceramic PCB is the best choice but a little bit higher cost.

Can be Customized

Busbar is a highly customization product in PCB design, it offers various options for its mechanical capability. So maybe you can find it in every industry, such as educations, medical instruments, factories, communications and various electronic devices. Tight space and compact devices require substitute electrical distribution, and busbars serve the purpose right. Due to its high compact and strong mechanical and chemistry, busbar PCB can be used in extremely harsh weather. This makes them a good choice in substations or devices that need to used outdoors.

Space Saving

Due to the copper materials mounted on the PCB, Busbar PCBs can replace multiple traces with a single, wider conductive strip, saving valuable space on the board. This compact design is particularly useful in applications where space is limited. In addition, busbar PCB provides multi-layer structure when your design is complex and has density traces network.

By means our extensive PCB & PCBA manufacturing and professional engineering team, we are highly able to build and design busbar PCBs according to your specific requirements. Meanwhile, we follow the strict quality system to make sure the high-quality of products. You are welcome to contact us or send e-mail if you want to make such busbar stiffener PCB.

Tags: Bus Bar PCB, Busbar PCB, Copper busbar PCB
Posted in best pcb, bestpcb, Ceramic PCB, FAQ, PCB News, PCB Technology, Special PCB | No Comments »

Top 1 Design and Manufacturing Considerations for Bendable Aluminum PCBs

March 7th, 2024

You know, bendable aluminum PCBs have gained prominence in various electronic applications due to their unique ability to flex and conform to curved surfaces. Unlike traditional rigid PCBs that are commonly composed of materials like fiberglass , these PCBs utilize aluminum as the base material, allowing it bendable and flexibility when needed. Compared to the rigid characteristics of traditional metal core PCB, bending aluminum PCB can be adapted to specific space requirements and shape requirements. In this article, we will introduce the characteristics of bendable aluminum PCBs and explore the key considerations that engineers and manufacturers need to pay attention during the design and production process.

What Are the Benefits of Bendable Aluminum PCBs?

May some designers are reraly to know the bendable aluminum PCB, in their congnition, the bendable PCBs are including flex circuits, rigid flexible circuit and FFC, and aluminum PCB is classfied into one of rigid PCB. But here, EBest Circuit (Best Technology) is so proud to say, we have developed bendable aluminum PCB and we can manufacture it with fast delivery and high-quality, this is what we prouded.

The primary advantage of bendable aluminum PCBs is their flexibility. They can be bent and shaped to fit into various form factors and designs, making them suitable for applications where space is limited or where flexibility is required and traditional rigid boards are not ideal. Common applications include wearable devices, curved displays, and other electronic systems with unconventional form factors.

Additionally, bendable aluminum PCB has the advantages of aluminum, so it has good heat dissipation and higher thermal management than traditional PCBs. This feature is crucial for maintaining the reliability and performance of electronic devices, especially those operating in high-temperature environments.

Considerations During the Design Process

Al Material Selection:

Considering that it is a bendable aluminum substrate, it must be satisfied that the material selection should be bendable but at the same time have good heat dissipation of the metal base. This aluminum base material is a specially designed aluminum alloy or aluminum base composite material. Meanwhile, the thickness of the material is critical, such as the material is generally from 0.2mm to 1.6mm, of which 0.2mm to 1.0mm is the more common bending metal substrate thickness.

Flexibility Requirements:

Defining the flexibility requirements is a crucial step in the design process. The degree of bending, bending radius, and any other factors related to flexibility must be clearly defined based on the intended application. For instance, a wearable fitness tracker might require a specific bending profile to comfortably conform to the curvature of the wrist.

Also note that the bending radius is different for materials of different thicknesses. In general, a smaller bending radius usually corresponds to a thinner board material, while a larger bending radius can accommodate a thicker board material.

Circuit Layout:

The layout of the circuit components plays a pivotal role in ensuring the longevity of bendable aluminum PCBs. Designers should strategically plan the arrangement of components to accommodate bending without subjecting critical elements, such as sensors or microcontrollers, to excessive stress. Even distribution of components contributes to a balanced bending profile.

And the pad should not be designed at the bend of the bending, which will cause damage to the assembly components after bending, or even no way to bend. In addition, the welding pad near the bending cross should also be kept away from the bending line to avoid collision and extrusion of the components after bending.

Bending Radius:

Determining the minimum bending radius that the PCB can tolerate is essential for preventing structural damage or compromise in electrical performance. Specific bending radii should be defined based on the application’s needs. For example, a bendable aluminum PCB designed for a wearable device might need to withstand repeated bending with a predefined radius.

Dielectric Layer:

Choosing an appropriate dielectric material is crucial for maintaining insulation between different layers of the PCB. The dielectric layer should possess flexibility to withstand bending without compromising its insulating properties.

As we know, when design the aluminum PCB, the thermal conductivity is also important. Bendable aluminum also has the thermal conductivity requirement, but when the thermal conductivity material is higher, the higher the content of ceramic powder in material. And when the content of ceramic powder is higher, the brittleness of the material is higher, and it is easier to break or break after bending. The material of 1W/m.k is more bendable than 3W/m.k。

Considerations During the Manufacturing Process

Bendable aera line：

For the production requirements of the light plate, the V-cut mark is generally used to determine the complete line at the bend, and attention should be paid to the depth control of the v-cut, so as not to damage the line.

Testing and Validation:

Prototyping is a vital phase in the manufacturing process of bendable aluminum PCBs. Thorough testing and validation are necessary to ensure that the PCB meets the required electrical and mechanical specifications. Bending tests simulating the intended application conditions should be performed to assess the PCB’s durability. such as bending test, bending angle test.

Generally speaking, after the bare board finished, it’s not bendable to the required angle. In order to avoid bad transportation or collision, some customers require not to bend and they will bend it by themselves. But if the customers don’t want to bend the board by himself, we also can help to bend it, it will require mold and it need to custom the package for shipping. The custom package can help to protect the damage in shipping.

Collaboration with Manufacturers:

Close collaboration with experienced PCB manufacturers is key to successful production. Manufacturers with expertise in flexible PCB fabrication can provide valuable insights into the manufacturing process. Working together ensures that the design aligns with manufacturing capabilities, optimizing the production of bendable aluminum PCBs.

Conclusion

In a word, the design and manufacturing of bendable aluminum PCBs involve a series of critical considerations to ensure the success and reliability of the final product. From material selection and flexibility requirements to testing, validation, and compliance with industry standards, each step plays a pivotal role in creating PCBs that meet the unique demands of modern electronic applications. By carefully addressing these considerations, designers and manufacturers can unlock the full potential of bendable aluminum PCBs in diverse and innovative electronic devices. Welcome to contact EBest Circuit (Best Technology) if you want to know more.

Posted in best pcb, bestpcb, Design Guide, mcpcb, Metal Core PCB, PCB News, PCB Technology, Special PCB | No Comments »

What Is Immersion Silver? Why Choose It for PCB Coating?

February 26th, 2024

Due to the growing concerns and advocacy for environmental friendliness, as well as the prohibition of harmful substances like lead (tin), an increasing number of industries are moving away from the use of HASL (Hot Air Solder Leveling) technologies for PCB (Printed Circuit Board) surface treatment. The current trend is to use other surface treatments such as OSP, gold plating, immersion tin, immersion silver, ENIG and ENEPIG. Among them, immersion silver becoming a popular choice since it has excellent performance and cost effectiveness.

What is Immersion Silver Finish?

Immersion silver finishing is an environment friendly surface treatment that coating a layer of silver (about 0.1~0.4um) on the copper surface to ensure the good solderability when assembly. When comparing its functional performance with other surface finishes like OSP and ENIG, immersion silver falls between them. It exhibits outstanding solderability and exceptional solder joint strength, surpassing OSP, which lacks a conductive barrier. However, when employed as a contact surface, immersion silver demonstrates lower strength compared to gold.

What is the Working Principle of Immersion Silver?

Immersion silver finishing uses chemical deposition to finish the whole processes. Electrochemical deposition is a method of reducing and depositing metals onto the surface of an object by controlling the current in a solution. In the immersion silver process, the pad serves as the anode (positive electrode), while silver acts as the cathode (negative electrode), with a current applied between them. This causes silver ions (Ag+) to be reduced to silver metal under the influence of the electric field, subsequently adhering to the pad surface and gradually forming a silver layer.

The displacement reaction of immersion silver is:

2Ag⁺ + Cu = 2Ag + Cu⁺⁺

This method utilizes both electrical current and chemical reactions to deposit silver from the solution onto the surface of the PCB pad, creating a uniform and porous silver layer.

Silver Plated Analyzing: Pros vs Cons

Before selecting the immersion silver coating, we should understand its advantages and disadvantages to consider whether it is suitable for your PCB project and end-applications.

Pros of immersion silver:

Cost-effective than immersion gold
Good surface flatness and low contact resistance
Corrosion resistance
Good solderability, especially for BGA chips or smaller components
Environment friendly
High reliability

Cons of immersion silver:

Difficult to handle, must wear gloves
Special storage conditions – if the package is opened and not all PCBs need to be used, it must be resealed quickly or use them within 24h.
Peelable masks can’t to use

Important Points You Must Know About Storage

For storage and handling, it needs more careful than immersion tin and OSP.
It is compliant with ROHS and safer than HASL.
In the dry conditions, it can be stored 6-12months.
PCB with immersion silver must be soldered within 24hours if package is unsealed.
If the immersion silver PCB has been stored for more than 12 months, a solderability testing is must before assembling.

Immersion Silver vs ENIG

ENIG also is a common surface treatment in the PCB manufacturing, its full name is Electroless Nickel/Immersion Gold finishing. The ENIG technology is a relative expensive than immersion silver, and it suitable for more complex layout design.

ENIG plating involves safeguarding the copper pads on PCBs by first applying a layer of nickel and then overlaying the copper surface with a thin layer of gold. In essence, the procedure is akin to immersion silver, but it significantly improves PCBs by providing enhanced resistance to oxidation, superior solderability, and excellent surface planarity.

Let’s review the performance comparison between these two surface treatments:

Welcome to contact us if you have any questions about immersion silver or other surface treatment.

Posted in best pcb, bestpcb, Ceramic PCB, FR4 PCB, HDI PCB, PCB News, PCB Technology | No Comments »