Flex circuits are largely used in PCB fabrications, EPCB found that most of us didn’t pay enough attention to those problems, such as the layer stack design, parts placement, cutouts, etc. But remember that flex circuits have some gnarly material quirks which range from relatively high z-axis expansion coefficients of adhesives, to the lower adhesion of copper to PI substrate and coverlay, to copper’s work hardening and fatigue. These can be compensated for largely by...
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