Paul - the commercial parts are most likely screen versions of the
industrial parts (-40C - 85C). It's not very good design
practice to heat up a part beyond it's rating, as since they are most
likely screened, Microchip will not guarantee the stability.

I noticed in Microchips selection guide, that the industrial part rated
at -40C to 85C can be ordered by adding an "I" before the package
specification, ie. the PIC16C63-04/SO would be specified as
PIC16C63-04I/SO..

Daniel Najemy - Numaliine Power Systems

> -----Original Message-----
> From: Kolesnikoff, Paul [SMTP:pkolesni@BALL.COM]
> Sent: Wednesday, January 14, 1998 10:38 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Temperature specs
>
> I have to deliver a unit with several 16C63 PICs and 24C32 EEPROMs.
> After I built a prototype, a temp spec was added of +77deg C. The
> commercial temp range goes to +70 deg C.
>
> My question is - are the industrial and automotive grade PICs a
> different design, or are they a select in test kind of part?
>
> If they are the former, where do I get the high temp parts? If the
> latter, can I just heat up the PICs I have to 80 deg C and see which
> ones break?
>
> Also, does the clock speed affect this? I'm running at 20MHz.
>
> I guess I should also mention that these are windowed parts.
>
> Thanks,
> Paul Kolesnikoff