Questions about the thermal resistance of C4D40120D

Henry23

Dear support member,

I have a question about the thermal resistance of discrete diodes with TO-247-3 packaging(C4D40120D).

There are two thermal resistances from junction to case shown in the datasheet, i.e., per leg and per device. What is the difference between them?

We connected an anode pin and the cathode pin for the measurement, and which value should we compare to? Per leg or per device?

Looking forward to your answer.

Best Regards

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