All of the circuit layers are laminated into a complete package using an epoxy-based substrate, such as FR4 or polyimide.īoards incorporating heavy copper circuits are produced in exactly the same way, albeit with specialized etching and plating techniques, such as high-speed/step plating and differential etching. Circuit layers start as thin sheets of copper foil (generally 0.5 oz/ft 2 to 2 oz/ft 2) that are etched to remove unwanted copper, and plated to add copper thickness to planes, traces, pads and plated-through-holes. Standard printed circuit boards, whether double-sided or multilayer, are manufactured using a combination of copper etching and plating processes. Sample featuring 2oz, 10oz, 20oz, and 30oz copper features on the same layer. On-board high-power-density planar transformersįigure 1.On-board heatsinks directly plated onto the board surface using up to 120-oz copper planes.Heavy copper plated vias carry higher current through the board and help to transfer heat to an external heatsink.Reduced product size by incorporating multiple copper weights on the same layer of circuitry (see Figure 1).
WEATHER PCB FULL
Use of exotic materials to their full potential (i.e., high temperature) without circuit failure.Increased mechanical strength at connector sites and in PTH holes.Increased endurance to thermal strains.The construction of a heavy copper circuit endows a board with benefits such as: Our discussion will focus primarily on Heavy Copper.
Copper weights above 20 oz/ft 2 and up to 200 oz/ft 2 are also possible and are referred to as EXTREME Copper. A heavy copper circuit is manufactured with copper weights anywhere between 4 oz/ft 2 to 20 oz/ft 2. Most commercially available PCBs are manufactured for low-voltage/low power applications, with copper traces/planes made up of copper weights ranging from 1/2 oz/ft 2 to 3 oz/ft 2. Using Heavy Copper and EXTREME Copper in PCB Design and Fabrication for Maximum ReliabilityĪn increasing number of power electronics products are taking advantage of a growing trend in the printed circuit board industry: Heavy Copper and EXTREME Copper Printed Circuit Boards.
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