Consider this a hypothetical question :)

We have some fabs that, due to reduced production requirements, have been in
house for an extended period of time (more than a year).  In investigating
some solderability concerns, the board house suggested that with thinner
HASL coatings, copper migrates through the tin-lead coating, reducing
solderability.  The vendor seemed to think that a six-month shelf life is
now an industry standard...indeed, he involved the magic name of IPC.

It has, admittedly, been a long time since I considered myself up to date on
PCB fabrication issues.

a. Is this a legitimate observation from our supplier?
b. Should we expect only a six month shelf life on PCB?
c. What rework method is recommended to bring these back in spec?

Thanks,

Bill Page

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