Limor sent this wonderful little document my way after we had some problems with a 0.4mm pitch footprint I made, just to see if we could improve the paste layer and reduce the bridging a bit: Root Cause Failure Analysis of Printed Circuit Board Assemblies. Despite the organization not being the best — a clearer separation of problems from potential solutions/recommendations would have been helpful — there’s a lot of useful information in here. It’s often easier to understand the kinds of problems you encounter working with fine-pitch devices looking at photos. Unfortunately, X-ray images of things like ‘ball-drop’ with BGA reflow aren’t easy to come by, nor post-mortem, sawed-in-half BGA packages, etc. If you’re fascinated by the many ways boards can die a premature death, this is a goldmine of info.
Our Ladyada (Limor Fried) was nominated for Red Hat’s Women in Open Source Award! Please vote for her! Visit: https://www.redhat.com/en/about/women-in-open-source
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