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Lets see ... datasheet errors ... (or likely ones ... )
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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:
--- Quote from: T3sl4co1l on June 12, 2019, 10:22:45 pm ---Sounds plausible at Tc=25C versus Ta=25C. Does it say?
Tim
--- End quote ---
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
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