TL783 thermal resistance, junction to ambiet so low ?

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Hello everyone,

I came across this part and it seems that the thermal resistance from junction to ambient is only about 19 C/W for a TO-220 package.

Almost every other TO-220 chip I have ever came across had it at about 62.5 C/W.

What kind of sorcery is this ? How can it be so low ?

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I agree that it looks awfully low. It is consistent with the other listed packages, however. I do wonder if it assumes being soldered to the board, though it never says so. It is also very odd that it does not specify the copper that it is attached to for the "ambient" condition; others usually do that.

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net