Hello,
What is typical shelf life of immersion tin?
As I remember, the problem with finish is oxidation of intermetallic layer
since tin is thin and porous. It also cannot pass solderability test after
reflow cycle (s). Couple years ago, I read a report by Shipley with
solderability data obtained from different coatings including immersion tin.
The solderability of tin was were poor comparing to imm gold over nickel and
HASL.
Chris
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