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Electronics => Projects, Designs, and Technical Stuff => Topic started by: 3roomlab on June 12, 2019, 08:47:40 pm

Title: Lets see ... datasheet errors ... (or likely ones ... )
Post by: 3roomlab on June 12, 2019, 08:47:40 pm
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
Title: Re: Lets see ... datasheet errors ... (or likely ones ... )
Post by: 741 on June 12, 2019, 09:19:34 pm
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."
Title: Re: Lets see ... datasheet errors ... (or likely ones ... )
Post by: T3sl4co1l on June 12, 2019, 10:22:45 pm
Sounds plausible at Tc=25C versus Ta=25C. Does it say?

Tim
Title: Re: Lets see ... datasheet errors ... (or likely ones ... )
Post by: 3roomlab on June 14, 2019, 03:42:51 am
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?
Title: Re: Lets see ... datasheet errors ... (or likely ones ... )
Post by: T3sl4co1l on June 14, 2019, 08:32:27 am
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