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

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Sn63Pb37 on RoHS compliant PWB

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#49003

Sn63Pb37 on RoHS compliant PWB | 12 April, 2007

We are running RoHS compliant & non RoHS compliant assemblies. We buy our bare boards from one supplier that only manufactures RoHS compliant boards using a Sn100 finish. Is there any known issues running leaded solder on a Tin finish? Does normal reflow and wave solder temperatures get the intermetalic bond?

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#49023

Sn63Pb37 on RoHS compliant PWB | 13 April, 2007

No problem in that.

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greg york

#49050

Sn63Pb37 on RoHS compliant PWB | 15 April, 2007

You may need slightly longer dwell times and a little more heat in the reflow and wave to ensure proper alloying/wetting. Also consider if you are using a nickel doped and high copper alloy on bare boards in Leaded wave solder bath you will pick up contaminate of those metals, Nickel especially is not too tolerant in 63/37 baths. Copper can be reduced fairly easily Cheers Greg

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Reflow Oven

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