Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

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TCE mismatch

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bill

#47337

TCE mismatch | 7 February, 2007

What is an acceptable mismatch for smt components and pcb. We are having cracked solder joints from fatigue after repeated thermal cycling 25 deg. c to 125 deg.c.

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#47346

TCE mismatch | 7 February, 2007

That's a peculiar temperature range for your cycling. What are your ramps and dwells?

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