F5 - Mur3020 diodes - heatsinks needed

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30A and Vf ~ 1V equates to 30W of heat that must be dissipated.
Even 5A & Vf ~ 700mV equates to 3.5W and that raises the Tj and Tc. The current must be limited to suit the actual operating temperatures.

If you have no heatsink, the de-rated current will be MUCH lower than with a small heatsink fitted.
 
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