According to PCB industry, however, peopel usually use this name to identify a printed circuit board with copper conductors 3 oz/ft2 – 10 oz/ft2 in inner and/or outer layers. The minimum width and thickness of a heavy copper PCB conductor is determined primarily on the basis of the current carrying capacity required and the maximum permissible conductor temperature rise.
Heavy copper conductors can significantly add to the overall board thickness. Its size and manufacturing process will determine the circuit board trace, may not be rectangular in shape. Typical conductor width/spacing/thickness tolerance is +/-20%, though tighter tolerance is achievable. Heavy copper has been widely used for a number of products but not limited to: high power distribution, heat dissipation, planar transformers, power convertors, and so on.
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