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CSD17312Q5: Is datasheet safe operating area correct ?

paul brooking
Prodigy 20 points
Part Number: CSD17312Q5
Other Parts Discussed in Thread: CSD17573Q5B, CSD16415Q5

Tool/software:

Hi I have been looking for a device with good dafe operating area to use to control a DC rail turn on.

The CSD17312Q5 is active and datasheet on TI site shows the device safe operating area extending to 100A, 12V , 1ms , single pulse.

This seems too good to be true, and the safe area plot does look a bit unusual. 

The device listed on the site which is said to be a functionally equiv. more modern device claims 20A or less

(csd17573Q5B)

Paul

 

  • 0
    TI__Mastermind 38200 points

    Hello Paul,

    Thanks for your interest in TI FETs. The CSD17312Q5 is an older generation device and the SOA curves in the datasheet are calculated. There is some limited data but none at 1ms pulse width. TI has a similar 25V device, CSD16415Q5, from the same process generation and die size that has been fully tested for SOA as described in the technical article at the link below. The CSD16415Q5 max SOA current at 12V/1ms is about 65A. I'd feel more comfortable using this conservative number. The CSD17573Q5B is a lower cost, newer process technology FET that shrinks the die size for the same on resistance as our older FETs. As such, the smaller die size has lower SOA capability than the CSD17312Q5. Let me know if you have any questions or need additional assistance selecting a FET for your application

    https://www.ti.com/lit/pdf/SSZTCR5

    Best Regards,

    John Wallace

    TI FET Applications

  • 0 in reply to John Wallace1
    Prodigy 20 points

    Hi John,

    thanks your comments and the link answer my questions. The TI devices all look very good in this respect, I was comparing with other manufacturers devices, which must be optimised  differently and noticably worse in this respect.

    Best wishes Paul