Often a chip will be available in several different packages. Sometimes QFN which has a thermal pad, and TQFP which has no thermal pad. The justification for the thermal pad is that it helps conduc
pcb - Do QFNs really need that thermal pad? - Electrical Engineering Stack Exchange
PDF) Via-in-Pad Design Considerations for Bottom Terminated Components on Printed Circuit Board Assemblies
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Distribution of the most frequent causes of electronic failures [22].
how bad practice is it to route traces inside a QFN?
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