Lets see ... datasheet errors ... (or likely ones ... )

[3roomlab]

I want to kick off this with infineon mosfets

numbers are taken from SOA chart 1ms @ 20V

AUIRF1324S-7P SOA =42A (D2PAK 7pin)
DMN6068 SOA =7A (DPAK)
AUIRFR8405 SOA = 30A (DPAK)
AUIRFSA8409-7P SOA = 4.5A (D2PAK 7pin)
AUIRFS8407 SOA = 40A (D2PAK)

I am thinking, the 8405 and 8409 specs are wrong and should be

AUIRFR8405 SOA = 3A (DPAK)
AUIRFSA8409-7P SOA = 45A (D2PAK 7pin)

any thoughts?
and feel free to share any other errors/ambiguities

[741]

Just grabbed the DS {AUIRFR/U8405 12 2017-10-04}. The corner of the 1mS curve,  Fig 8, at 20V looks like 30A.

That said, they own up to a mistake on that figure in an older copy of the DS
"10/17/2014 Corrected label on SOA curve Fig 8  on page 4."

[T3sl4co1l]

Sounds plausible at Tc=25C versus Ta=25C. Does it say?

Tim

[3roomlab]

Sounds plausible at Tc=25C versus Ta=25C. Does it say?

Tim

the AUIRFR8405 chart says Tc 25C
is there a fundamental thing I am missing?

[T3sl4co1l]

You can't heatsink a DPAK so that Tc=25C under load, but they rate them that way regardless.  Or they often do.

Whereas Ta=25C it's doing, a watt or so, and definitely not as much DC current.  The difference could easily be 3 vs. 30A.  Also matters what the layout is, if it's minimum footprint or, say, metal or ceramic substrate!

Tim