Hi Free/Net,

since nobody answered my question about how important is to have the same alloy (SAC) at both wave and SMT, versus having SAC in SMT and SN100C in wave, I try to get in through the back door.

The question is about SN100C mini wave pot contaminated with SAC305. In the light of the info that SAC eats the copper in the TH, we've decided to keep the SAC305 in the wave (avoid 2 different alloys on the same assembly), but fill the mini-wave with SN100C. Since mini-waving is less controllable, we would avoid eating all the copper if the operator falls asleep.

But what about dropping a bar of SAC into the SN100C pot? What will be the effect on the board? And what about the reworked joints, some SAC will mix with the SN and create weird alloys in the joints? And what about the SAC that will come down from the pins into the pot?

Anybody has a clue?

Many thanks,

Ioan

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