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Original question:

ISO7710-Q1: inquire Operating condition when Pin No.1 or 3 opens

ISO7710: Pin-to-pin substitution between digital isolator

Antonio Paolini
Prodigy 10 points
Part Number: ISO7710
Other Parts Discussed in Thread: ISO721,

Dear TI Engineering team,, 

I found that ISO721 could be a drop-in replacement, but in my case it is not good because I need the default state of the output to be low.
I saw on your site that ISO7710F would be pin-to-pin compatible (and match my specs on the output) but I am left with a question.
I read on the forum that for the ISO7710-Q1 it has pins 1 and 3 connected internally. Are they also not connected  in the non-automotive version as well?
I have pin 3 NC on my PCB, and I would like to be sure I can leave it floating.

Thanks in advance for any suggestions.

P.S. in the ISO721 datasheet (SLLS629L) there is a "cross reference" section with the explanation of what pins are tied-up internally and all the info needed to make the right replacement.
I really appreciated this section; it should be put in all datasheets.

  • 0
    TI__Mastermind 49345 points

    Hi Antonio,

    Welcome to TI E2E forum and for showing interest in TI isolators!

    ISO7710F (industrial) and ISO7710F-Q1 (complete part number - ISO7710FQDWRQ1) are the same devices, the latter, being an automotive device, will go through additional automotive specific qualification and testing. Hence, just like the ISO7710F-Q1, the ISO7710F also has pins 1 and 3 internally connected.

    Please note that ISO721 is one of very old digital isolator family devices, released back in 2006. We recommend using our latest generation devices and this includes ISO7710F, ISO7710F-Q1 and ISO7810F.

    Thanks for your feedback on cross reference section from ISO721 datasheet. We now have cross reference tool added into TI website itself, please find below the link. Thanks.

    https://bomcross.ti.com/en/


    Regards,
    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    Prodigy 10 points

    Thanks for all the information! I'll adopt the ISO7710F.

    Have a nice day!