I am currently using windowed packages in high temperature and low temperature applications. I have taken a PIC16c73A up to 185 C and had it run fine at that temperature (only 455khz though). We spec all our tools using this device at 160 C.

My present project using a PIC17c44 has run from  -55C to 160C at 5MHz using the windowed ceramic package also.

I don't know how they will run at 20MHz, but for seven more degrees I don't think you will have a problem.

-----Original Message-----
From:   Kolesnikoff, Paul [SMTP:pkolesni@BALL.COM]
Sent:   Wednesday, January 14, 1998 8:38 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