Heavy Copper PCB Manufacturing and Assembly at Bittele Electronics

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Bittele Electronics provides manufacturing and assembly services for heavy copper PCBs, supporting designs that incorporate increased copper thickness on internal and external layers. Heavy copper printed circuit boards are used in electronic applications that require high current capacity, enhanced thermal performance, and long-term reliability under electrically and thermally demanding conditions. 

While there is no universally accepted industry definition, printed circuit boards are generally classified as heavy copper when the copper thickness reaches 3 oz per square foot or more on inner or outer layers. Boards with copper weights exceeding 4 oz per square foot are also commonly categorized as heavy copper designs. At the upper end of the range, extreme copper constructions may use copper thicknesses from approximately 20 oz up to 200 oz per square foot.

Typical heavy copper PCBs feature copper weights between 3 oz and 10 oz per square foot on internal and external layers, with some designs extending beyond this range based on application requirements. Increased copper thickness, combined with thicker plating and suitable substrate materials, improves mechanical strength and electrical durability.

Design and Fabrication Considerations

The use of heavy copper conductors significantly increases overall PCB thickness, making copper weight an important factor during the design phase. Current-carrying capacity in heavy copper PCBs is determined by both conductor width and copper thickness, requiring careful consideration of layout and thermal performance.

Bittele Electronics supports heavy copper fabrication through controlled manufacturing processes capable of handling thick copper layers and heavy copper-plated vias. These vias enable elevated current flow through the board while also supporting heat transfer to external thermal management structures, such as heat sinks.

Performance Characteristics and Advantages

Heavy copper printed circuit boards are designed to withstand repeated exposure to high current, elevated temperatures, and thermal cycling—conditions that can rapidly degrade standard PCBs. Their higher tolerance to electrical and thermal stress makes them suitable for applications operating in harsh or high-power environments.

Additional characteristics of heavy copper PCBs include support for compact designs through multiple copper weights on the same layer, improved heat dissipation, and the integration of onboard high-power-density planar transformers.

Applications and Assembly Support

Heavy copper PCBs are used in a range of applications, including power supplies, power converters, power distribution systems, welding equipment, automotive electronics, and solar energy systems. They are also commonly deployed in industrial control systems, military equipment, and aerospace applications.

In addition to fabrication, Bittele Electronics provides assembly services tailored to heavy copper PCB designs. Assembly processes account for increased board thickness, higher thermal mass, and specialized soldering requirements to ensure reliable electrical and mechanical performance.

Click here to learn more about heavy copper PCBs from Bittele Electronics.