> -----Original Message-----
> From: piclist-bounces@mit.edu On Behalf Of Olin Lathrop
> Sent: Thursday, June 19, 2008 9:07 AM
> 
> Different PICs vary in this regard. The standard "I" temperature 
> range is often just from 0-70C or something like that. Some PICs 
> only come in one temperature grade that does cover -40C, for 
> others -40C is included in the "I" grade. It's your job to look 
> this up and make sure you are using the right temperature grade. 
> I was just trying to point out this issue because it is something 
> you might not have thought about. For many PICs, the "E" grade 
> would be required for -40C.

  0 to 70 degC  = commercial range
-40 to 85 degC  = industrial range
-40 to 125 degC = extended range

AFAIK, all Microchip parts follow this temperature rating system (most other
semi mfg's use the same ranges for commercial and industrial designations). 

So I believe all I and E range parts are OK to -40, of course check the data
sheet for a specific part to be certain.

Paul Hutch




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