Rule of thumb has always been 2 years in my company.
If purchasing should procure parts older we usually
perform solderability testing per MIL STD.  If the
component is a  memory type we may have some
parametric tests done.


But usually 2 years is  ok.

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      Don F. Fumia
      [log in to unmask]
   Schneider Automation
      No. Andover MA
   978-975-9344   FAX x9714
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