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Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


How low temperature solder joint can survive

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#73304

How low temperature solder joint can survive | 7 January, 2015

Customer puts our board to thermal test. Test cycle is -55c to 85c, repeat cycle in 15-20min. After 600 cycles, lot of TSOP joints are cracked, leads lifted. There are reasons such as thin PCB, mechanical impacts, warped PCB... My question is, how low temperature solder joint can survive through the test. Anyone has document about that issue to share? Thanks

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#73305

How low temperature solder joint can survive | 7 January, 2015

Additional info: I use SAC305 solder paste on Enig PCB.

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#73308

How low temperature solder joint can survive | 8 January, 2015

I bet you that the problem comes from the ENIG brittle solder joints. About low temperatures I think you can go to the absolute 0 and the device should still work.

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