When meeting with a new client or engineer, I am often asked, "What is the maximum number of layers a flex circuit can have?" Like many "general" questions there's the quick answer and there's the right answer. My quick answer is "eight," but the more correct answer may be "it depends." We live by many design "rules," but any engineer or PCB designer will admit to bending these rules on occasion. The key is to know how and when to bend these rules, and how to use proper FMEA procedures to mitigate risk.
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