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What is the true amp capacity of the ISOTOP package?

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strantor

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I have recently learned that the amperage ratings on most high powered MOSFETS are out to lunch. for example the **broken link removed** is "rated" @ 110A but the TO-220AB package it is in is only rated for 75A. Not all data sheets say this, even in the fine print. I am considering this STE250NS10 in ISOTOP package, which looks a lot safer than the little toothpick legs on other MOSFETS, but I am still leary of the 220A rating. Does anyone know how much the ISOTOP package is actually rated for?
Thanks
 
Do the math...

They give you the package specs on each lead. Calc the cross-sectional area and figure its' ampacity.

I've "enhanced" my access to the chip by putting a large solder fillet up the lead right to the epoxy block. That's all we can do.
 
Ok, according to this picture, the leads are 32mil X 315mil.
**broken link removed**
I go to this PCB trace calculator and plug in a thickness of 32mil and play with the amps until it comes up with a trace width of 317mil. Amps work out to 53A.
seems a little low. Even if you were able to exceed that, I have read that there is another limiting factor: "the internal connections of the mosfet 'die' are limited by their physical size" - another spec that the manufacturers don't include in the datasheets.
 
I've been puzzled by this as well. My suspicion is that chip ampacity is more a figure of tolerance to heat & thermal conductive latency than raw power wielding.

I'm thinking a larger ampacity die will handle more switching current heat and allow the package to "catch up" before internally burning up. But not as a substitute for spreading the average load across enough heat sunk area.

I've only played in power stuff, and willingly yield to my betters... <<<)))
 
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