FROM: James D. Herard
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Subject: fab: Solderability


Ref:  Solderability

I caution against too many hasl cycles.  Besides the fact that
the board will begin to look less pleasant (brown/burned),
each thermal cycle does reduce the life, and most boards
are not intended for more than a certain number of solder
cycles in their entire life time, including reworks.

We perform a similar screen  and look test.  I'd recommend you
perform some microsections to look grain structure and
intermetalics.

if in extreme doubt, I'd recommend you solder a board up and
put it on thermal cycling test or HAST.

Good Luck

Jim

James Herard  x77026  KBLE/014-3         Quality Engineer
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