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Fairchild Response 2015-05-14 07:19:10
Hello Ed Mellinger.
I did the SOA test under Vds=20V & 10ms time.
Qty of sample is 25pcs.
**Test result**
ID_max : 25A
ID_min : 24A
As this test result, MOSFET will be safe under your set condition.
(note)
Even though the test result is good, but there is small margin between
21A(datasheet) and 24A(test result). Please consider it.
Thank you.

Fairchild Response 2015-05-12 01:10:52
Hello.
It is a calculated data graph in datasheet.
In case of Trench gate medium voltage MOSFET, they have some weakness
compared to Planar MOSFET as your comment. But, this product is not
Trench gate tech. It is Planar tech. Normally, Planar MOS's SOA
performance is similar to the calculated one.
But I will make a clear information. And I will do the test under your
condition, 20V & 10ms. After the test, let you know the test result.
Thanks.

Has the HUF75345 FBSOA (Fig 5 in data sheet) been derated for thermal
runaway and hot-spotting? I am designing a current limiter that will
require operation at 20V and 20A, simultaneously, for several
milliseconds. The datasheet FBSOA implies a 10 millisecond limit for
this part... is this accurate?
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