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Going over rated Power Dissipation of MOSFET
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help_me_pick_username:
I have a 30N06l which is rated for a power dissipation of 79w. If I have adequate cooling, can I dissipate more heat with the MOSFET?
ejeffrey:
79 W is only with the case at 25C -- i.e., perfect heat sinking.  Unless you have chilled water cooling you aren't going to be able to even reach 79W.
wraper:
Under realistic (good) cooling don't push more than 30W out of it if you want to have any reliability. And by good I mean either actively cooled with fan or just HUGE heatsink.
viperidae:
You'd need a heatsink at -15 degrees to run at 79W. The case to heatsink thermal resistance is 0.5C/W, so to keep the case at 25C the heatsink needs to be 79*0.5C lower.
help_me_pick_username:
Two broken 30N06Ls later, here we are. Thanks for the info guys, at least I learnt some more about how to read a datasheet properly.
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