> Bob Ammerman wrote...
>
> >[Dave D.]:
> >> But if you're talking about a dozen chips that were purchased all at
the
> >> same time or in a couple of lots, I wouldn't draw ***ANY*** conclusions
> >> whatsoever from what you measure.  Absolutely none.
> >
> >Of course, if the dozen chips are all you'll ever need for the
application,
> >and you carefully characterize those (and perhaps a few spares), then
you're
> >all set.

To comment on my own comment...

Although you can characterize the chips as they are right now, that may not
hold after they age under bias and temperature for days, months, years or
decades.

Bob Ammerman
RAm Systems

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