I think with enough research, it might be possible to operate a complex electronic system at Venus ambient temperatures.

An article on high-temp electronics here. Of course, this is just one of many components that would have to be addressed, and it would have to be compared to developing a high-temp refrigeration system (with glowing hot heat rejection coils! I have no idea what the working fluid would be.)

The easy way is, of course, insulation and a very limited lifetime. Maybe there is some fluid or metal that could be simply evaporated to extend the lifetime of such a system. That raises contamination issues...