Heavy Copper PCB

Heavy copper PCBs are defined by copper weights of 4 oz per square foot and above — significantly thicker than the 1–2 oz copper found in standard PCBs. This increased copper mass enables boards to carry substantially higher currents, dissipate heat more effectively, and withstand the mechanical and thermal stresses of demanding power electronics environments.

We supply heavy copper PCBs with copper weights from 4 oz up to 20 oz, supporting designs that require reliable operation under continuous high current loads. The thicker copper traces and planes reduce resistance, minimise voltage drop across the board, and dramatically improve thermal management compared to standard copper weights.

Heavy copper technology is increasingly used alongside standard copper layers in the same board — a technique known as extreme copper or mixed copper weight construction. Power layers use heavy copper for current carrying capacity while signal layers use standard copper for fine-pitch routing, combining high power handling with signal integrity in a single compact board.

From EV charging infrastructure to industrial motor drives and renewable energy inverters, heavy copper PCBs are the foundation of modern power electronics — enabling more power in less space with greater reliability and longer service life.