>I saw these claims of unbelievable current and wondered if a
>FET in a TO220 case could really handle 80amps.  I found this
>artical and found it useful for understanding that question.
>I think it is a good read if you have time.
...

Certainly a good read.

I have been using some chips where the current rating is specifically 
defined as "package limited" and have versions of the chip in 2 packages, 
one TO-39, and the other SMD0.5, with the latter having a significantly 
higher current rating. The distributor assures me they have the same die 
inside.

For many of these modern power switching FET chips, the current limitation 
seems to be the package lead resistance.

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