I have seen many claims of conformal coating helping for protection against, amongst many other things, extreme temperature. One such claim in here would be: Question regarding PCB coating
My understanding is that such coatings act as a relatively good thermal insulator; is that right? What I do not understand, however, is how they can be effective when the components themselves need to dissipate heat?
We use heat sinks with good thermal conductivity and large surface area to ensure heat can dissipate quickly, so long as the environment's temperature is lower. And if the environment is warm, then I can see how coatings could help insulate the board from the environment.
I'm probably missing something obvious, but how about conditions where we expect the environment and electronic component to warm up beyond its specified operating temperature limits?
In my specific scenario, I'm looking at PIC32MZ, probably the extended temperature range (-40 to 125 deg C), and thinking of having a system-level operation range that gets to about 110 deg C, and want a good tolerance margin. I could also do with using the industrial version of PCB components if I can get away with it.