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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


discolored pbfree finish after bake and/or reflow

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#41108

discolored pbfree finish after bake and/or reflow | 20 April, 2006

hello! need ur inputs... if the Matte Sn pbfree finish of the component discolors AFTER having been exposed to bake, or, after reflow, will the base leadframe have any potential contribution to it? i know most likely suspects would be the plating process at manufacturer, or the reflow or bake process might also be suspect, but is it valid to investigate the base leadframe condition?

thanks!

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#41115

discolored pbfree finish after bake and/or reflow | 21 April, 2006

I guess the first thing to look at is the temperature. We had to heat more for QFP256 on sample boards and we saw discoloration on some small parts. Just try to sense around when profiling to see what's there.

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Reflow Oven

reflow oven profiler