Easy peasy
Advanced Member level 6
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).