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76 DESIGN007 MAGAZINE I FEBRUARY 2022 Article by Bill Hargin Z-ZERO The following is an excerpt from the recently- released, The Printed Circuit Designer's Guide to... Stackups: The Design within the Design by Bill Hargin. Click here to download this entire book. For most of my career, I worked exclusively with rigid PCBs. Rigid-flex boards were those things in my cellphone. Then, about six years ago, while working in the laminate space, I started getting requests for low-flow prepregs and getting pulled into rheology testing. Since then, I have learned a lot more about rigid-flex stackups and included rigid-flex support in our stackup-soware solution. is chapter shares some of the lessons I learned along the way. Flex and rigid-flex designs refer to a PCB that is partially or entirely constructed using dynamic, flexible substrates instead of being exclusively made of rigid substrates. Flexible BOOK EXCERPT Chapter 7 Rigid-Flex Materials

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