John;
        As I had said in an earlier discussion, pics will work to fairly high temperatures. 
        In the downhole environment, we deal with pretty extreme temperatures (
for electronics anyways), ( Matt Bonner could propably agree with me on this).

I personally have had ceramic (windowed) packages running at 185C at freqencies from 500 KHz to 5MHz. I actually haven't failed any due to temperature response of the micro.

-----Original Message-----
From:   John Payson [SMTP:supercat@MCS.NET]
Sent:   Wednesday, February 04, 1998 12:32 PM
To:     PICLIST@MITVMA.MIT.EDU
Subject:        Re: ??? high temperature PIC ???

> I've been using PICs for years at high temp (above 135).  Email me
> privately and let me know what your project is (if you're a competitor,
> my lips are sealed).

I too am looking at using a PIC in a potentially-high-temperature application,
for a boiler-mounted liquid sensor (the PIC will be outside the boiler and
insulated from it, and so 'hopefully' not get over 80c or so, but I'd like
to have some idea that the whole thing isn't going to melt even if ambient
gets excessively hot or if it's placed near a steam vent or something.