16F18877 specifically

There's a bunch of charts in the datasheet with fancy curves, as well as the 85C limit for extended operation (section 37.2).

1. At what point is it recommended to start glueing a heatsink on these puppies?

2. Is there a rule of thumb? Or is it arbitrary?

3. And if you do cool PICs, what adhesive do you use? What heatsinks?


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