Understand the Structure of Heavy Copper PCBs

Posted on 2020-07-15

The basic structure of heavy copper PCBs

Heavy copper PCBs manufacture 4 ounces or more of copper on each layer. 4 ounce copper PCBs are most commonly used in commercial products. The concentration of copper can be as high as 200 ounces per square foot. Heavy copper PCBs are widely used in electronics and circuits that require high power transmission. In addition, the thermal strength provided by these PCBs is impeccable. In many applications, especially in electronic products, the thermal range is critical because high temperatures cause severe damage to sensitive electronic components and severely affect circuit performance.

The heat dissipation capacity of heavy copper PCB is much higher than that of leisure PCB. Heat dissipation is essential for the development of rugged circuits. Improper thermal signal processing will not only affect the performance of electronic equipment, but also shorten the life of the circuit.

Heavy copper PCBs can be used to develop high-power circuit wiring. This routing mechanism provides more reliable thermal stress handling, and provides fine processing, while integrating multiple channels on a single-layer compact board.

Heavy copper PCBs are widely used in various products because they provide multiple functions to improve circuit performance. These PCBs are widely used in high-power equipment such as transformers, radiators, inverters, military equipment, solar panels, automotive products, welding equipment and power distribution systems.

Heavy copper PCBs manufacturing

Just like standard PCB manufacturing methods, heavy copper PCBs manufacturing requires more fine processing. Traditional heavy copper PCBs are manufactured using outdated technology, resulting in uneven tracking and undercutting on the PCB, resulting in low efficiency. However, today, modern manufacturing technology supports fine cutting and minimal undercutting.


Thermal stress processing quality of heavy copper PCBs

When designing a circuit, factors such as thermal stress are critical, and engineers should eliminate thermal stress as much as possible. Over time, PCB manufacturing processes have evolved and various PCB technologies have been invented, such as aluminum PCB, capable of handling thermal stress. It is the interest of heavy copper PCBs designers to maintain the circuit while minimizing the power budget. The performance with heat dissipation performance and environmentally friendly design.

Overheating of electronic components can lead to malfunctions and even life-threatening. Hazard management cannot be ignored. The traditional process for achieving heat dissipation quality is to use external heat sinks, connected together with heat-generating components. Since the heat-generating components are close to high temperature without dissipating heat, in order to dissipate this heat, the heat sink consumes heat from the components and transfers them in the surrounding environment. Generally, these heat sinks are made of copper or aluminum. The use of these radiators not only exceeds the development cost, but also requires more space and time. Although the result is not even close to the heat dissipation capacity of heavy copper PCB.

In heavy copper PCB, the heat sink is printed on the circuit board during the manufacturing process instead of using any external heat sink. Since the external heat sink requires more space, the placement of the heat sink is less restrictive.

Because the heat sink is electroplated on the circuit board and connected to the heat source using conductive vias instead of using any interfaces and mechanical joints, heat is quickly transferred, thereby improving heat dissipation time. Compared with other technologies, heat dissipation vias in heavy copper PCB can achieve more heat dissipation because the heat dissipation vias are developed with copper. In addition, the current density is improved and the skin effect is minimized.

The advantages of heavy copper PCBs

The advantages of heavy copper PCBs make it a top priority for the development of high-power circuits. Heavy copper concentration can handle high power and high heat, which is why high power circuits have been developed using this technology. Such circuits cannot be developed with low copper concentration PCBs because they cannot withstand the huge thermal stresses caused by high currents and flowing currents. Heavy copper PCB is generally considered high current PCBs because of their significant heat dissipation capabilities.


The relationship between PCB copper thickness and current is an important factor in using heavy copper PCB. As the copper concentration increases, the total copper cross-sectional area also increases, which reduces the resistance in the circuit. As we know, losses are devastating for any design, and the copper concentration enables these PCBs to reduce the power budget.

The connector is indispensable when the jumper is connected. However, connectors are often difficult to maintain on traditional PCBs. Occasionally, the strength of the PCB is low, and the connector part is usually affected by mechanical stress, but the heavy copper PCB provides higher strength and ensures higher reliability.

Kingford’s heavy copper PCBs manufacturing

Heavy copper PCB manufacturing requires proper care, and improper handling in the manufacturing process may result in poor performance, and always consider the services of experienced manufacturers.

Kingford provides executive PCB manufacturing facilities for various types of PCBs. Kingford has focused on heavy copper PCB manufacturing and developed high-quality images for the past ten years.

Heavy copper PCB is manufactured on advanced automated machines, which allows us to develop highly reliable PCBs. So far, we have developed two-layer PCBs, up to 20 ounces, and multi-layer PCBs, which weigh 4-6 ounces of copper.

For more information, please contact us.