Heavy Copper

DefinitionAsk the Saturn Flex Systems Expert
Although there is no official definition for Heavy Copper PCB,  most folks in the industry label PCBs containing three or more ounces of copper on either the inner or outer layers as a heavy copper circuit board.  
High power distribution boards; power distribution junction boxes (automotive); heat dissipation; planar transformers; DC to DC power converter.

Additional information on Heavy Cu

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Heavy Copper PCB