Technetters, the following question is vague, and I'm sure that I'll get a
lot of "it depends" type of answers, but that's fine as long as the
responses contain some examples of guidelines that are followed.
-   The solderability on many devices must be verified prior to assembly if
the devices have surpassed a certain date code limit.
So, here's the question:
-   Once the solderability has been tested on one of these "old" lots, for
how long do you consider the test results valid?  i.e. I may have some
devices with date codes that are 24 months old where I verified their
solderability 1 month (or choose any time period for the example) ago.
Should I re-verify solderability again prior to releasing them for assembly?

I'm looking for any guidelines that are used or considered in such
situations. I understand that storage conditions are likely the main
variable and that a general guideline is not likely.  Any case-specific
examples would be greatly appreciated.

Yves Trudell
Nortel, Wireless Networks Calgary
Quality System Engineering

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