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questions about iso7141 and iso7242

Alessandro Chianese
Prodigy 30 points

Dear All,
I'd like to use the ISO7242 to isolate the UART from the RS485 transceiver (TX->INA, RTS->INB, RX->OUTC and CTS->OUTD).
In TI application notes, I found that is suggest to use ISO71XX for this application.
In the ISO71XX's datasheet is also specified in the applications section.
Are there any problem in my setup?

The last question is about the isolation rating.
In the ISO71XX's datasheet is indicated that the isolation value is: 2500Vrms but the same parameter there isn't in the ISO72XX's datasheet.
Could you tell me How much is this value, please?

Thanks a lot.
Best regards.

  • 0
    TI__Genius 14015 points

    Hi Alessandro,

    Your setup sounds correct. ISO71xx is the recommended device because it is our latest and greatest device family. They are in a much smaller package compared to the older ISO724x parts, while still having a high isolation rating. 

    The ISO71xx parts have a 2500Vrms isolation rating per UL 1577. This same parameter can be found in the ISO724x datasheet on page 17, in the regulatory information table. The rating is also 2500Vrms per UL 1577. 

    Let me know if you have any more questions!

    Thanks,
    Jason Blackman 

  • 0 in reply to Jason Blackman
    Prodigy 30 points

    Thanks a lot Jason,
    your answer was very quick and clear.

    I use the ISO7242 because there isn't the same configuration in the ISO71XX family, isn't it?

    About the isolation value, for to be compliant at my regulatory I need to have 500Vdc for one minute and 500Vac for one minute.
    Do you think that can I comply my regulatory?

    Thanks again
    Regards

  • 0 in reply to Alessandro Chianese
    TI__Genius 14015 points

    Hi Alessandro, 

    There is a 4:2 channel configuration device in the ISO71xx family, it just hasn't released yet. It is called the ISO7142, and it is planned to release in October. 

    Both the ISO71xx and the ISO72xx devices will be able to meet 500Vdc and 500Vac for 1 minute without any problems. 

    Thanks!
    Jason Blackman