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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Rohs finish with lead past

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#57470

Rohs finish with lead past | 2 December, 2008

Does anyone know if it possible to use Sn63/Pb37 paste on a board with Sn100 finish. Any thoughts on this will be greatly appreciated.

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#57471

Rohs finish with lead past | 2 December, 2008

This shouldn't give you any issues as long as you don't have to be RoHS compliant.

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#57476

Rohs finish with lead past | 3 December, 2008

Careful on fine pitch QFPs. They will be your weakest joint if your parts are no-lead. And don't think you can simply run a no-lead profile either. Depending on your paste, you cannot simply run your profile in the no-lead temps and expect your flux to keep up. It will burn off early and leave you with a weak solder joints. Been there, done that, fun ride. Use a paste that has a flux designed to run in the hgigher temps, plus about 2% silver added in the mix will help a lot.

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