CamLight wrote:You're right, I(A) is the avalanche current rating. You can see the avalanche energy rating, 3J, just below it.
There's no independent package current limit value for the IXFZ520N075T2, you have to look at the I(D25) rating. This is 465A but ONLY FOR A CASE TEMP OF 25C!!! Since this is impossible for anything other than a single, very short pulse, you have to derate I(D25) as the package heats up.
Check out Figure 6, Drain Current vs. Case Temperature.
I see, but that is just a "rating" right, tells me nothing about whether it is the silicon or the leads or the epoxy that can't stand it. It's still over 100 amp more at 100 deg C than 4368 at 25C. It's got a smidge lower on resistance than 4368 and is a bit larger slug area too. I've emailed to ask them where to get a few. I never destroyed big fets before, so it would be interesting.
By "case" I assume they are referring to slug (metal base), and not epoxy...?
EDIT: It seems like fig 6 is just a derating to keep junction temp below the rated 175C. Nothing to do with the legs apparently. If you use Rds on vs temp graph (ie 2.7mOhm @ 175C), and the jc c/w number (0.25), you can plot the same graph.