[SOLVED] Calculating FET temperature rise

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Zak28

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I CAN calculate out power dissipation for fets by hand however I obtained ~RMS 170mW for a fet via simulation. Junction to ambient (no heatsink involved) would be ~120°C/W (sot-23 steady state) thus thermal rise for device is simply 0.17*120? In which case it would rise 20.4°C over ambient temp. Im pretty sure this is correct but Im not sure, please let me know if its proper.

Your input is greatly appreciated.
 

Basically correct. Besides average power, pulse power rating may need checking.
 
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