What are Copper Coin PCBs?

A Copper Coin PCB is a type of multilayer printed circuit board that incorporates a solid copper insert called a ‘copper coin’ into the board stack-up. Positioned beneath heat-generating components, the copper coin creates a direct thermal pathway from the component to an external heat sink or other heat-dissipating structures integrated into the PCB. Unlike conventional PCBs that rely on thermal vias and interface pads, copper coin PCBs dramatically enhance thermal conductivity, eliminate hotspots, and offer superior mechanical support. With thermal conductivity values reaching up to 400 W/mK compared to less than 1 W/mK for typical PCB materials, these boards are ideal for high-density, high-power, and thermally demanding applications.

Structure and Types

Copper coins are inserted into pre-machined cavities during PCB Fabrication and are strategically placed beneath high-power components to form a low thermal resistance path. There are two main types:

• Embedded Copper Coin PCB: In this type, the copper coin is placed in a routed slot and laminated along with the PCB stack. This creates excellent mechanical and thermal bonding and is ideal for applications that require both structural strength and efficient thermal management.
• Buried Copper Coin PCB: Here, the copper coin is pressed into a milled groove and captured using prepreg layers during lamination. While it provides similar benefits, this method is typically used when the copper insert needs to remain fully internal.

Copper coins come in various shapes like T-shaped, L-shaped, or other custom geometries to maximize contact area under constrained board layouts.

Key Advantages

Copper coin PCBs offer a range of benefits that make them ideal for high-power, high-performance applications. Their most significant advantage is superior thermal performance, as the copper insert creates a direct, low-resistance path for heat to escape, reducing thermal buildup and preventing component overheating. In addition to excellent heat dissipation, copper coins also enhance electrical performance by improving conductivity and power delivery—critical for maintaining signal integrity in high-speed computing and RF communication systems. This internal thermal management often reduces or eliminates the need for bulky external heatsinks, enabling more compact, lightweight designs—particularly valuable in mobile, automotive, and aerospace applications. Mechanically, the copper coin reinforces the PCB structure, helping it withstand vibration, warping, and thermal cycling, which is especially important in demanding environments. Furthermore, the direct metal-to-metal contact reduces dependency on thermal interface materials such as pads and pastes, which can degrade over time, improving long-term reliability.

Applications

Copper coin PCBs are widely used across sectors that demand high power and thermal performance:

• 5G Communication Equipment: For managing heat from baseband processors and RF components.
• Electric Vehicles (EVs): In battery management systems (BMS), motor controllers, and onboard chargers where thermal control is essential for safety and reliability.
• Power Electronics: In converters and inverters that operate under high current loads.
• LED Systems: For effective thermal management in high-brightness, space-constrained lighting.

Conclusion

Copper coin PCBs improve digital circuitry as system designers can develop exceptional thermal conductivity, exceptional electrical performance, and high mechanical integrity, as it is laced with massive copper inserts, while greatly improving the miniaturization and design versatility of electronics. This is applicable in applications ranging from 5G to electric vehicles, industrial power systems, and advanced computing. Copper coin PCBs are transforming performance envelope boundaries in high-performance electronics. As applications demand even more power in smaller packages, the copper coin PCB remains an essential component of efficient and high-reliability electronics design.