MOSFET running at high temperature

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some what surprisingly, down hole power converters run at up to 250 degC, and there are several papers out there with off the shelf fets (good brands) running at 200 degC in full bridge config (soft switching). Many low volt fets are rated to 175 junc. However lifetime is compromised, and if the fets don't die the solder connections will go bad pretty quickly unless you use a high temp solder process (cf gold or indium solder on space equip).
 
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I've run parts at 300C for many months and seen them drift
not at all, until the oven went bad and ran away cooking the
experiment altogether (as in fire extinguishers and angry lab
techs). You need much more to drive dopant distribution.
Maybe less, to simply activate "stragglers" in the implant
population, but this would be minor.

A device without a good contact barrier system could see
aluminum or gold in-migration, if the device baseplate temp
is significantly exceeded locally. This, more than average
temp, is a concern. Averages mean Jack. It's all about the
"micro-climate" when you're talking first failure.
 
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