Archive for the ‘Metal Core PCB’ Category

Do you know the relationship between copper thickness and circuit width & spacing?

Saturday, September 2nd, 2023

We know the precision control and performance of a product are paramount, only know that PCB can be built with a nice function, so, to understand the intricate relationship between copper thickness and circuit width and spacing is pivotal. These two parameters are like the gears of a well-oiled machine, interlocking in ways that significantly influence the printed circuit board‘s functionality, signal integrity, and manufacturability. If the designer does not consider the relationship between these two, the design may need to be modified in subsequent production.

In order to avoiding this information, let’s embark on a deeper exploration of this dynamic relationship to uncover its nuances and implications now,

Frist of all, we need to know some basic information about PCB, like copper thickness, circuit width and spacing.

  1. The Essence of Copper Thickness

Copper, known for its exceptional electrical conductivity, is the lifeblood of any PCB. The copper thickness refers to the amount of copper deposited onto the board’s surface during fabrication. It’s the foundation upon which the traces, the intricate pathways that carry electrical signals, are built. The standard copper thickness is often measured in ounces per square foot (oz/ft²) or micrometers (µm). Common options include 1oz (35µm), 2oz (70µm), and even higher, it depends on customer’s requirement.

  • Circuit Width and Spacing

Circuit width and spacing, though often overlooked, are integral components that determine a PCB’s performance, integrity, and overall functionality. Circuit width refers to the dimension of the conductive traces, while spacing pertains to the distance between these traces. These seemingly simple dimensions have a profound impact on the PCB’s behavior.

Secondly, Unveiling the Intricate Relationship

The relationship between copper thickness, circuit width, and spacing is a sophisticated interplay of electrical properties, heat dissipation, and signal integrity. Let’s delve deeper into this complex web of interactions:

Current-Carrying Capacity and Copper Thickness: Copper thickness directly influences a trace’s ability to carry current without succumbing to overheating. Thicker copper translates to higher current-carrying capacity and reduced resistive losses. However, the trade-off is that wider traces are necessary to accommodate the increased copper thickness.

Resistance and Circuit Width: Wider traces exhibit lower resistance, which in turn reduces voltage drop and enhances the efficiency of signal transmission. Designers must strike a balance between trace width, copper thickness, and available board space.

Spacing and Unwanted Interactions: As circuit spacing decreases, the probability of unwanted interactions, such as crosstalk and electromagnetic interference, rises. Thicker copper can exacerbate these issues due to its larger cross-sectional area. Maintaining appropriate spacing between traces is pivotal to prevent signal degradation and maintain integrity.

Heat Dissipation and Trace Width: Thicker copper also aids in better heat dissipation, a crucial consideration for power-intensive applications. However, this can necessitate wider traces to manage the thermal load effectively.

Signal Integrity and Crosstalk: Smaller spacing reduces the risk of crosstalk, but it’s a double-edged sword. Thicker copper traces may introduce higher capacitance, altering impedance and potentially impacting signal integrity. This delicate balance requires careful consideration during design.

For now, we have known the relationship between them, how to develop a best design between the circuit width & spacing and copper thickness, which depends on what’s you really want, the huge current or heat management? Following details should be considered if you want to develop the best circuit width & spacing.

Current Requirements: Start by understanding the current requirements of your traces based on the components and operational conditions. Selecting the appropriate copper thickness and trace width ensures the PCB can handle the anticipated loads.

Thermal Management: Thicker copper facilitates heat dissipation, which is advantageous for power-dissipating components. However, remember that it might necessitate wider traces to ensure effective heat transfer.

Manufacturability: While thicker copper can enhance current-carrying capacity and heat dissipation, it might pose manufacturing challenges. Consult with PCB manufacturers to align your design choices with their capabilities.

Signal Integrity Analysis: Utilize simulation tools to analyze signal integrity, especially when dealing with smaller spacing and thicker copper. These tools provide insights into impedance matching, potential crosstalk, and overall performance.

Flexibility VS Rigidity: While thicker copper enhances many aspects, it can impact the PCB’s flexibility, crucial for certain applications. Evaluate the mechanical demands of your project and strike the right balance.

Regarding metal core PCB in Best Technology, the copper thickness and its accordingly circuit width & spacing like below, furthermore, it would be better if you can let me know your copper thickness before checking your drawing, we will give you the best solution before formal production.

Copper thicknessMinimum circuit widthMinimum circuit spacing
0.5-2oz0.25mm0.23mm
3oz0.35mm0.3mm
4oz0.4mm0.38mm
(trace_design_guide_of_MCPCB)

Conclusion: Striking the Optimal Balance

The intricate relationship between copper thickness, circuit width, and spacing in PCB design embodies a delicate equilibrium that significantly influences a design’s performance and functionality. This nuanced interplay directly impacts parameters such as current-carrying capacity, resistance, heat dissipation, and signal integrity.

Achieving the optimal balance between these factors requires a deep understanding of electrical properties, thermal considerations, and signal behavior. Designers must carefully evaluate the specific requirements of their projects and leverage simulation tools to fine-tune their choices. Collaboration with PCB manufacturers ensures alignment with manufacturing capabilities.

The dynamic nature of this relationship underscores the constant evolution of PCB technology. As devices become smaller, faster, and more interconnected, the demand for intricate layouts intensifies. Designers must continuously adapt to new challenges, pushing the boundaries of what’s achievable while adhering to the fundamental principles that govern PCB design.

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Enhancing UV LED Performance with MCPCB: Advantages and Innovative Applications

Thursday, August 10th, 2023

In the field of ultraviolet light-emitting diodes (UV LED), the integration of Metal Core Printed Circuit Boards (MCPCB) plays a significant role in improving UV LED performance, thermal management, and overall reliability. In this blog post, we will explore the importance of MCPCB in UV LED applications, highlighting its advantages with concrete data to demonstrate its practicality.

  1. Efficient Heat Dissipation:

MCPCBs excel in efficient heat dissipation, ensuring optimal UV LED performance and longevity. With a metal core typically made of aluminum or copper, MCPCBs possess high thermal conductivity. For instance, MCPCBs have a thermal conductivity coefficient of normally 1.0-3.0 W/mK, it needs to be customized if the thermal conductivity exceeds 3.0W/mk. this exceptional thermal conductivity allows for rapid dissipation of generated heat, preventing heat accumulation and ensuring UV LEDs operate within their optimal temperature range.

2. Enhanced Thermal Conductivity:

MCPCBs contribute to effective heat dissipation through improved thermal conductivity. Studies indicate that MCPCBs can enhance thermal conductivity up to ten times higher than standard FR4 PCBs. Because the stack up of MCPCB is different with PCB, please see below stack up. This enhanced thermal conductivity aids in achieving a uniform temperature distribution across the entire MCPCB, reducing the risks of hotspots and thermal stress on UV LEDs. Consequently, UV LEDs can maintain their performance and reliability even during extended operation.

(MCPCB_stack_up)
1ozCopper layer
1.5mm without copperCore base
(FR4PCB_stack_up)

3. Reliability in Harsh Environments:

MCPCBs are designed to withstand harsh environments, ensuring reliability in UV LED applications. The metal core of MCPCBs provides higher mechanical strength and resistance to thermal stress. For example, the coefficient of thermal expansion (CTE) of an MCPCB can be matched with UV LEDs, minimizing the risk of mechanical failures caused by thermal mismatch. These features enable MCPCBs to operate reliably even in high-temperature environments or under exposure to ultraviolet radiation, thereby extending the lifespan of UV LED devices.

4. Electrical Isolation:

MCPCBs offer electrical isolation between the metal core and circuit layers, ensuring safe and reliable operation of UV LEDs. The dielectric layer, typically made of materials such as epoxy resin or thermally conductive dielectric (TCF), exhibits high breakdown voltage and insulation resistance. This electrical isolation minimizes the risk of short circuits or electrical interference, protecting UV LEDs and the entire system from potential damage.

5. Performance Optimization:

By incorporating MCPCBs into UV LED technology, manufacturers can optimize the performance of their UV LED devices. The improved heat dissipation and thermal conductivity of MCPCBs enable UV LEDs to operate at maximum efficiency. Research shows that using MCPCBs can reduce LED junction temperatures by up to 20-30°C, improving light output and enhancing overall performance. This optimal performance ensures consistent UV light generation, making MCPCBs an ideal choice for various UV LED applications, including curing, sterilization, and phototherapy.

Conclusion:

The use of MCPCBs in UV LED technology offers practical benefits in heat dissipation, thermal conductivity, reliability, and electrical isolation. Concrete data and research support the effectiveness of MCPCBs in efficient heat management, even in harsh environments, enabling reliable operation of UV LEDs. With enhanced performance provided by MCPCBs, UV LED systems can deliver consistent, efficient, and durable UV light output, expanding the possibilities of UV applications in various industries. The utilization of MCPCBs further solidifies their critical role as a key supporting technology in the UV LED field.

If you are designing a metal core PCB and seeking for a reliable manufacturer, welcome to leave you message or contact us directly.

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Do You Know How Many Types of Holes in PCB

Tuesday, July 4th, 2023

In the vast realm of engineering and manufacturing, there exists a hidden world of holes, each with its own distinct purpose and position. These holes play a crucial role in facilitating various functions within mechanical and electronic systems. In this blog, we will embark on a journey to explore different types of holes in printed circuit board. So, fasten your seatbelts and let’s delve into the fascinating world of these essential engineering features.

Common Types of Holes in PCB

Upon examining a circuit board, one will discover an array of holes serving specific purposes. These include Via holes, PTH, NPTH, Blind holes, Buried holes, Counterbore holes, Countersunk holes, Location holes, and Fiducial holes. Each hole type fulfills a distinct role and function within the PCB, making it crucial to familiarize oneself with their characteristics to facilitate optimal PCB design.

1. Via holes

Via holes are small openings that connect different layers of a printed circuit board (PCB). They facilitate the seamless flow of signals and power between the layers, enabling efficient circuit design and transmission. Vias can be classified into two types: Plated Through-Holes (PTH) and Non-Plated Through-Holes (NPTH), each serving different functions.

2. PTH (Plated Through-Hole)

Plated Through-Holes (PTH) are vias with conductive material coating the inner walls. PTHs establish electrical connections between different layers of a PCB, allowing the passage of signals and power. They play a crucial role in interconnecting components, facilitating the flow of electrical current, and ensuring the functionality of the circuit.

3. NPTH (Non-Plated Through-Hole)

Non-Plated Through-Holes (NPTH) lack the conductive coating on their inner walls, making them suitable for mechanical purposes only. These holes are used for mechanical support, alignment, or as positioning guides, without establishing any electrical connections. NPTHs provide stability and precision, ensuring proper alignment of components within the circuit board. The mainly different between PTH and NPTH is the copper foil will be plated in the hole wall while NPTH no need to do plate.

4. Blind Holes

Blind holes are partially drilled holes that penetrate only one side of a circuit board. They are primarily employed to connect the outer layer of the board with the inner layer, enabling component mounting on one side while remaining hidden from the other. Blind holes offer versatility and help maximize space in complex circuit board designs.

5. Buried Holes

Buried holes are entirely enclosed within a circuit board, connecting inner layers without extending to the outer layers. These holes are hidden from both sides of the board and serve to establish connections and routes between inner layers. Buried holes allow for denser circuit board designs, reducing the complexity of routing traces and enhancing the overall functionality of the board. They provide a seamless and compact solution without any surface exposure.

6. Counterbore Holes

Counterbore holes are cylindrical recesses created to accommodate the heads of bolts, nuts, or screws. They provide a flat-bottomed cavity that allows the fasteners to sit flush or slightly below the surface of the material. The primary function of counterbore holes is to enhance the aesthetics and functionality of a design by providing a smooth and even appearance. These holes are commonly found in woodworking, metalworking, and engineering applications where a concealed or larger bearing surface is desired.

7. Countersunk Holes

Countersunk holes are conical recesses designed to house the angled heads of screws or fasteners. They are employed to ensure that the screw heads lie flush or slightly below the material surface. Countersunk holes serve both aesthetic and practical purposes, providing a sleek and flawless finish while reducing the risk of snags or protrusions. Their versatility makes them suitable for various applications, from furniture manufacturing to aerospace engineering.

8. Location Holes

Location Holes, also known as Reference Holes or Tooling Holes, serve as key reference points for aligning and positioning components, parts, or fixtures during manufacturing or assembly processes. These holes are strategically placed in a design to ensure precise and consistent alignment, enabling efficient assembly and reducing errors.

9. Fiducial Holes

Fiducial Holes, also referred to as Fiducial Marks or Alignment Marks, are small precision holes or markings placed on a surface or PCB (Printed Circuit Board). These holes serve as visual reference points for vision systems, automated processes, or machine vision cameras.

As we conclude our journey through the fascinating world of holes in engineering, we have gained a deeper understanding of the functions and positions of counterbore holes, countersunk holes, via holes, PTH, NPTH, blind holes, and buried holes. These holes are essential elements in various industries, contributing to the aesthetics, functionality, and efficiency of designs.

After introducing each of them, you should have gained a deeper understanding of their functions, hope this is helpful for you the design holes on your PCB project!!

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Exploring the Possibilities of UV LED & Importance of MCPCB

Monday, June 12th, 2023

UV LED technology has opened up a world of possibilities in various industries, revolutionizing applications that require ultraviolet light. From curing adhesives to sterilizing water, UV LEDs have become indispensable in many fields. In this article, we will explore the possibilities of UV LED and discuss the crucial role that Metal Core Printed Circuit Boards (MCPCBs) play in enhancing its performance and reliability.

Introduction to UV LED

UV LED refers to light-emitting diodes that emit ultraviolet light in the range of 100 to 400 nanometers. Unlike traditional UV lamps, UV LEDs offer numerous advantages, including energy efficiency, compact size, and precise control over the emitted wavelength. These characteristics make UV LED technology highly versatile and suitable for a wide range of applications.

Where we can use UV LED?

UV LED lights are finding extensive applications in our daily life, below are some popular fields that it can be apply in.

  • Healthcare and Medicine

One promising area where UV LED lights are making a significant impact is in the field of disinfection and sterilization. UV-C radiation, emitted by UV LEDs, has been proven to effectively kill or inactivate microorganisms such as bacteria, viruses, and fungi. Unlike traditional disinfection methods, UV LED technology is safe, energy-efficient, and chemical-free. It finds applications in healthcare facilities, food processing, water purification, and air sterilization systems, ensuring a cleaner and healthier environment. Metal core PCB plays a crucial role in UV-C radiation since MCPCB has good durability and excellent corrosion resistance compared to traditional FR4 PCB. It makes the UV-C radiation performs high performances and long-time lifespan.

  • Industrial and Manufacturing

Another exciting application of UV LED lights is in advanced manufacturing processes, such as 3D printing and lithography. UV-curable resins and photopolymers can be rapidly cured using UV LED exposure, enabling faster production speeds and higher precision. Additionally, UV LED technology allows for the precise control of light wavelengths, which is crucial in fields like electronics, where specific wavelengths are required for the fabrication of microchips and displays.

  • Agriculture

UV LED lights are finding their way into horticulture and agriculture. UV-B radiation, emitted by UV LEDs, has been shown to stimulate plant growth, increase yields, and enhance crop quality. By tailoring the light spectrum using UV LEDs, growers can optimize plant development, promote flowering, and even modulate specific plant traits. The efficient heat dissipation of the metal core circuit board in UV-B radiation ensures prolonged functionality without concerns of excessive heat generated during extended operation. This technology has the potential to revolutionize indoor farming and enable year-round crop production in controlled environments.

  • Environmental Sustainability

UV LED lights play a vital role in environmental sustainability efforts. They are increasingly used for water and air purification systems. UV LED water purifiers effectively deactivate or destroy harmful microorganisms in water, providing safe drinking water without the use of chemicals. Additionally, UV LED air purifiers can eliminate airborne pathogens and allergens, improving indoor air quality. Metal core is a relatively environmentally friendly and healthy material, not only the material itself does not contain volatile substances such as benzene, but also through the solidification of ultraviolet light will form a dense curing film, which can reduce the release of harmful gases in the substrate. So metal core PCB as the substrate for UV LED is a good choice for demand of industry sustainable development.

Importance of MCPCB in UV LED Technology

With the big possibilities of the UV LED, the importance of MCPCB in UV LED technology cannot be overlooked. Thermal management is crucial for UV LEDs, as they generate a significant amount of heat during operation. Without proper heat dissipation, the performance and lifespan of UV LEDs can be compromised.

1. MCPCBs effectively address the thermal management challenges associated with UV LED technology. By efficiently dissipating heat, MCPCBs help prevent overheating, which can lead to reduced lifespan, color shifting, or even LED failure. The use of MCPCBs ensures that UV LEDs operate at their optimal temperature, maximizing their performance, and extending their lifespan.

2. Additionally, MCPCBs contribute to the overall efficiency of UV LED systems. By maintaining lower operating temperatures, MCPCBs minimize the energy losses due to heat. This improved efficiency translates into cost savings and a reduced environmental impact.

3. The last but not least, the reliable and stable construction of MCPCBs also contributes to the longevity and reliability of UV LED systems. With their excellent mechanical strength, MCPCBs protect UV LEDs from physical damage and ensure consistent performance over time.

As the demand for UV LED technology continues to grow, the importance of MCPCB in optimizing its performance and reliability will remain paramount. With ongoing advancements in MCPCB technology, we can expect even more efficient and durable UV LED systems in the future. Best Technology specializes in the manufacturing of MCPCBs. With our state-of-the-art factory and highly skilled engineering team, we can offer you the exceptional one-stop services. If you are currently engaged in a UV LED project and require a dependable supplier, we warmly invite you to reach out to us at your convenience. We are committed to providing reliable solutions for all your UV LED needs. Feel free to contact us anytime.

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What is UVLED? Is MCPCB important for UVLED?

Saturday, June 3rd, 2023

UVLEDs, a subset of light-emitting diodes (LEDs), emit light within the ultraviolet spectrum instead of visible light like traditional LEDs. The UV spectrum is further divided into three main categories based on wavelength: UVA, UVB, and UVC. In this blog, we will explore the critical role of Metal Core Printed Circuit Board (MCPCB) in UVLED technology, highlighting its significance in improving efficiency, heat management, and overall lifespan.

UVA (315-400nm):

UVA, also known as near-ultraviolet, emits long-wave ultraviolet light. It is closest to the visible light spectrum and finds applications in UV curing, forensic analysis, counterfeit detection, tanning beds, and more.

UVB (280-315 nm):

UVB emits medium-wave ultraviolet light and is renowned for its biological effects. It is used in medical treatments, phototherapy, disinfection applications, and even for inducing vitamin D synthesis in the skin.

UVC (100-280 nm):

UVC emits short-wave ultraviolet light and possesses powerful germicidal properties. Its applications include water purification, air disinfection, surface sterilization, and eradication of bacteria, viruses, and other microorganisms.

UVLEDs typically operate within a temperature range of -40°C to 100°C (-40°F to 212°F). However, it is crucial to note that excessive heat can impact the performance, efficiency, and lifespan of UVLEDs. Therefore, appropriate thermal management techniques such as heat sinks, thermal pads, and adequate airflow are commonly employed to dissipate heat and keep UVLEDs within the optimal temperature range.

In conclusion, MCPCB plays a vital role in UVLED technology, offering essential advantages such as efficient heat dissipation, enhanced thermal conductivity, reliability in harsh environments, and electrical isolation. These qualities are paramount for maximizing UVLED performance, ensuring longevity, and maintaining optimal operating temperatures. The significance of MCPCB lies in its ability to enhance efficiency, improve heat management, and provide a reliable foundation for UVLED systems. Without MCPCB, UVLED applications would face challenges in heat dissipation, performance stability, and overall safety.

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The Difference Between 2L MCPCB and Double Sided MCPCB

Monday, February 27th, 2023

In our last article, we know what a metal core PCB is, in this post, we will introduce what is the difference between 2L MCPCB and Double sided MCPCB. Please continue to read if you want to know more about metal core printed circuit board.

Today we will explain from these four contents as following:

  1. Stack up (structure)
  2. Heat dissipation
  3. SMD populate
  4. Manufacturing technology

Stack up of 2L MCPCB and Double Sided MCPCB

For a 2L MCPCB, the metal core is positioning on the bottom side of the MCPCB as a cooling carrier to the whole MCPCB, while the metal base of double sided MCPCB is located in the middle of two copper trace. In generally, some PTH (plated-through-hole) vias are needed to designed to connect the bottom and top traces.

Below are the stack ups of these two kinds of products, from the structure, we can easily distinguish which one is 2L MCPCB and which one is double sided MCPCB.

Heat dissipation of 2L MCPCB and Double Sided MCPCB

Due to the different structure of the two products, their heat dissipation performance is also different. The main reason is the heating of double-sided metal core circuits can be spread out through both top and bottom side, while the heating generate by SMD components of 2 layers circuit only can be dissipated through bottom (metal) side and the heat need to go down layer by layer. In addition to this, the dissipation of FR4 is not good than metal materials, so double-sided metal core printed circuits perform better heat dissipation performance than 2 layers MCPCB.

Surface mounted locations (SMD populate)

Nowadays, surface mounted technology (SMT) is widely used in printed circuit board industry, more and more designers prefer to populate electronic components of the circuit surface to achieve high density, stable electrical performance and high reliability. 2L metal core circuit boards and double-sided metal core circuits also show their different mounted locations in this aspect.

The populate location of a 2L MCPCB only available on copper trace side, that is top side. And a double-sided metal core PCB can mount components on both top and bottom side, because both of them exist copper trace on it.

Manufacturing technology

May somebody will curious about “Are these two products produced in the same process/technology?”

The answer is obvious “NO, they have a different laminate process when fabricating.”

Different with single layer MCPCB, double sided MCPCB requires an additional pressing step to laminate the thermal conductive layer and metal core together. But sometimes, some raw Metal Clad material vendor will supply board material which already laminated.

For 2 layers metal core PCB, due to it is made of a single MCPCB and a double-sided FR4 PCB, the first thing we should make a double sided FR4 PCB, then laminate the PCB together with the single MCPCB. But due to the thermal conductive layer (pure adhesive) is easy to overflow during laminating process, which will cause the poor adhesion and crack between metal core and FR4 PCB. In the meantime, to avoid such problem, an experienced operator is needed to proceed the laminated process. That is why the lead time and cost of a 2 layers metal core circuit is much longer and expensive.

This is the end of this post, if you still have some questions or difficulties about the metal core PCB, welcome to contact us at sales@bestpcbs.com, our professional sales team and engineering team will give you a best solution for free.

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Do You Know What a Metal Core PCB Is?

Saturday, February 25th, 2023

Metal Core Printed Circuit Board (short for MCPCB) is a technology developed to overcome the thermal limitations of the FR4 Printed Circuit Board. Different with traditional FR4 PCB, the PCB uses FR4 material as base core, while the base material of a metal core PCB is aluminum or copper. So compared with FR4 PCB, Metal Core is a better choice if your boards need to perform in high temperature environment.

What is metal core PCB?

A Metal Core PCB (MCPCB), also known as a thermal PCB or metal backed PCB, is a type of PCB that a metal material as its base for the heating dissipation part of the board. The thick metal is covering one side or double side of the PCB. The purpose of the core of a MCPCB is to redirect heat away from critical board components (such as LED or IC chips), and to less crucial areas such as the metal heatsink backing or metallic core. Base metals in the MCPCB are used as an alternative material to FR4 boards.

(Metal_core_PCB)

Same as FR4 PCB, the metal core PCB can be divided into Single layer MCPCB, Double layers MCPCB and Multi-layer MCPCB.

  • Single layer MCPCB

A single layer MCPCB is consist of a metal base (usually aluminum or copper alloy), thermal conductivity/dielectric layer and a copper trace layer, you can check below stack up for more details. Due to it only has one layer copper trace, sometimes we called it as one-layer MCPCB or single sided MCPCB.

(Stack_up_of_single_layer_MCPCB)

The single sided MCPCB can be used with surface mount and chip & wire components, and provides much lower thermal resistance than FR4 PCB. What’s more, the metal core provides lower cost than ceramic substrates, and allows much larger areas than ceramic substrates.

Meanwhile, superior heat dissipation and good durability of Aluminum of metal core PCB can greatly eliminate heat sinks or other some voluminous hardware for engineers or designers.

  • Double layer MCPCB

Double layers MCPCB (2L MCPCB) has two copper layers on one side of PCB, and metal core as a base core on the bottom side of whole MCPCB, so the components only can be populated on the top side, below is a structure of double layer MCPCB.

(Stack_up_of_double_layers_metal_core_PCB)

From the stack up of double layers MCPCB, we can see it consists of a single layer MCPCB and a double sided FR4 PCB, so it needs an additional pressing process to laminate the thermal conductivity and FR4 PCB. Compared with normal FR4, this structure needs more technology and experience on laminating of two layers together with metal core.

There are two layers copper trace on the surface of MCPCB, can we call it as double sided MCPCB like single layer MCPCB?

The answer is NO, because they have different structure and perform different properties. In our next post, we will show you the differences between double sided MCPCB and 2 layers MCPCB.

  • Multi-layer MCPCB

Same as FR4 PCB, for those copper traces more than 2 layers, we named them Multi-layer MCPCB. Its structure is same as FR4 PCB, but more complex to fabricate. Below is a typical stack up of a 4 layers MCPCB:

(Stack_up_of_4L_MCPCB)

Contrast with single layer or double layers MCPCB, multi-layer MCPCB can populate more components and achieve better performance in electronical performance.

Why Choose Metal core PCB?

Metal core PCB offers a great list of advantages when apply in a high-power application, below we listing some benefits of it:

  • Excellent heat dissipation
  • Lower thermal expansion than FR4 PCB
  • Dimensional stability than polyimide FPC
  • Great durability
  • Long lifetime
  • High utilization rate of space due to the heating can be transferred quickly
  • High strength and lightweight than FR4 PCB
  • Cost-effective

Where can we use Metal core PCB?

Metal core PCB can be used in high-power filed where requires fast cooling, good heat dissipation characteristics, the following popular applications may give you a guideline:

  • LED lighting
  • Power suppliers
  • Power conversion system
  • Automotive electronics
  • Telecom industrial
  • Photovoltaics
  • Semiconductors

With more than 16 years manufacturing experience, Best Technology is one of MCPCB supply leaders in Asia with good metal core PCB capability, we are so confident that we can provide you high quality, fast delivery and excellent one-stop service. Warm welcome to contact us if you have inquiries.

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Why HASL Surface Treatment Is Not Suitable For Sink Pad MCPCB?

Thursday, January 12th, 2023

Sink Pad MCPCB is a special type of metal core PCB (short for MCPCB), the working principle is through the sink heat pad solder direct to the metal substrate (commonly copper or alumina substrate), so people also call it as Thermal pad MCPCB. Sink Pad MCPCB is popular recently due to its excellent heat dissipation and thermal conductivity. Since the copper is easy to get oxidation, coating a metal film is good for protecting the surface, such as ENIG, ENEPIG or OSP. Lead-free hot air solder leveling (HASL) also is a kind of surface treatment, but why we don’t suggest to apply it? Let me explain with you.

Why is HASL not recommended?

  • Substrate

From the substrate aspect, due to the HASL process is to first dip the solder on the circuit board, then dip the solder flux in the melting, and finally blow off the excess solder on the printed board with the hot compressed air in the air knife through the two air knives, at the same time to eliminate the excess solder in the metal hole, so as to get a bright, smooth and uniform solder coating. Since most of customers prefer choose copper substrate as the base material (Aluminum core sink pad PCB thermal conductivity only could be 235 W/m.k, while Copper core sink pad PCB thermal conductivity could reach to 400 W/m.k). However, copper base is much heavier than alumina core, during the hot air knife scraping tin process, the copper surface is easy to be scratched and get damaged to affect the poor appearance and a short circuit risk. This is one of the reasons why HASL is not suitable for Sink Pad PCB.

  • Structure

From the structure of the Sink Pad MCPCB, the LEDs Chip Thermal Pads solder contact to the copper substrate directly, no dielectric between LEDs heat out pads and the Metal core. As you can see the stack up as below, what Sink PAD PCB laminate is pure film, the adhesion is not very good, so there’s a risk of delamination if do HASL (lead free).

  • Chemical

From the chemical aspect, due to the HASL (lead free) has the process of return the film, the potion will react with the copper chemically, which will bring the poor coating and poor adhesion, so we don’t recommend to use HASL on the Sink Pad MCPCB.

Advances of the Sink Pad MCPCB

  • Thermal conductivity 235 To 400 W/m.
  • Super good heat dissipation
  • Power LED junction temperature
  • Longer LED life
  • Most economical direct thermal path solution
  • Direct thermal path
  • Different structure can be made according different design needs

When can we use Sink Pad MCPCB?

With so many kinds of PCB types, when and where can we use the Sink Pad MCPCB?

  1. The copper metal core has high density, strong thermal conductivity and carries heat effectively. That means, it is possible to dissipate the same heat using a smaller sink-pad MCPCB, as compared to regular MCPCBs. So it is suitable be used in small applications which need to apply in high temperature.
  2. Very popular with high power LED mounting, sink-pad MCPCBs with their thermoelectric separation structure, can minimize the lumens depreciation of the LED, thereby prolonging the life of the LED lamp. Sink-pad MCPCBs are suitable for mounting high-power LED lamps and COB packaged LEDs. Moreover, manufacturers can tailor the sink-pad MCPCB to match the different design requirement needs of any LED.

Best Technology is a professional Sink Pad MCPCB manufacturer for more than 16 years in Asia, we have strong engineering team and specialized sales team can provide most suitable solutions for your applications in a very short time. What we can provide not only include single layer Sink Pad MCPCB, we also can produce 2 layers, double layer and multi-layer Sink Pad MCPCB. View https://www.bestpcbs.com/products/sinkpad-board.htm to know our capability about Sink Pad MCPCB.

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Types of Metal Bases Utilized in MCPCB

Tuesday, May 10th, 2022

What is metal core printed circuit?

Metal core printed circuit board is abbreviated as MCPCB. And namely, the core or the base material of MCPCB is a metal instead of the traditional FR4/CEM1-3.

Types of metal bases used in MCPCB

The metal cores of the thermal PCB can be aluminum, copper and steel alloys. Apart from being cheaper than copper, aluminum is known for its good heat transferring and dissipation abilities, which is the most common used. However, copper is considered to be a better performer. So, why does the aluminum become the first choice for the material of the MCPCB?

Aluminum base—The aluminum PCB offers good heat dissipation and heat transferring ability. Since they are also light in weight, the aluminum core PCBs are widely used in LED products.

Aluminum Core PCB

Copper base—The copper core board features a better performance than aluminum. But customers will usually choose the aluminum instead of copper, for it is relatively expensive. Also, compared with the aluminum, the copper is heavier and involves a tough machining process.

Copper Core PCB

Various base metals and their properties

Metal Base MaterialThermal Conductivity
(W/m-K)
Coefficient of Thermal Expansion
(µm/m-°C)
Aluminum88-25125
Copper38617

Based on the table, it can be known that although the thermal conductivity of the copper is better than that of the aluminum, its ability of thermal expansion does not perform better than the aluminum.

Therefore, there are some reasons why the aluminum is the first choice for the material of the MCPCB, including the lower cost compared to copper, light weight, excellent durability and its heat transferring capabilities.

And these are also the reasons that the MCPCB is widely used in the LED products as we mentioned in the last article.

So, this is the end of this article. In case if you have any questions, you are welcome to contact us via email at  sales@bestpcbs.com. We are fully equipped to handle your PCB or MCPCB manufacturing requirements.

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Why is the MCPCB Widely Used in the LED Products?

Saturday, April 30th, 2022

MCPCB refers to metal core printed circuit board. It has a good performance in heat dissipation, so it is often used in LED products.

The advantages of MCPCB

Prevent overheating: 

LEDs tend to get overheated very quickly. If a metal core printed circuit board is used, it solves overheating by transferring the energy from one side to another.

Improve the material’s reliability: 

The MCPCB plays a key role in the elements that heats up overly at times. It helps to divert the heat from one side to another where the heat has vanished, which improves the product’s life, making it much more durable.

Adapt to a high temperature: 

Unlike the FR4 technology, the metal core printed circuit board can adapt to products with a high temperature, hence it proves to be very useful for LED products.

LED PCB

Why is the MCPCB widely used in the LED products?

Since it is well-known that the LED products will emit a lot of heat. Based on the advantages, the metal core PCB can transfer heat quickly and prevent overheating. And Aluminum PCB is mostly used in metal core PCBs, for they can operate longer than other metals and longer shelf life.

Moreover, metal core PCB has a high conductive ability, hence there remains ample space for maximum LEDs, which allows producing sufficient light and achieving high performance.

Therefore, based on the advantages of the MCPCB, it is the prior option of the material for the LED products.

So, this is the end of the article. In case if you have any questions, you are welcome to contact us via email at  sales@bestpcbs.com. We are fully equipped to handle your PCB or MCPCB manufacturing requirements.

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