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EMI performance of ISO71XXCC parts vs "Robust EMC parts"

Joshua Yam
Prodigy 100 points

I have been looking at quad digital isolators with good EMI performance/low emissions from TI. 

 

unless i have been hallucinating, 1-2 months ago, the ISO71XXCC series of digital isolators were recommended on the TI website (Featured products for Digital Isolators) having superior EMI performance.

Checking back again, this ISO71XXCC series is no longer ‘EMI featured’ and has been replaced by a new series of isolators that are featured as “Robust EMC” parts

 

E.g. the following ISO774X quad channel parts for various forward/reverse configurations.

 

With that, I was hoping if anyone could provide me some insight on:

 

1)      How would the ISO774X / Robust EMC rated parts compare with the initially featured 71XX series in terms of EMI performance?

2)      Has there been any feedback from the field/customers on the EMI performance of the 71XX series?

3)      How the 71XX series would compare to other ‘standard’ isolators in terms of EMI. Is there still a distinction in terms of EMI superiority?

Appreciate it

Thanks

  • 0
    TI__Guru 55795 points
    Hi Joshua,

    ISO71xx family does have good EMI performance whereas ISO77xx has improved even further over that. Both ISO71xx and ISO77xx family of devices show really good EMI performance.

    1. ISO77xx family of devices uses different modulation technique to transmit data across barrier and in addition uses Spread Spectrum that reduces emission further lower than ISO71xx family.

    2. We haven't really seen EMI issues on digital isolators.

    3. As stated earlier most digital isolators from TI have very good EMI performance and the newer devices tend improve slightly over older devices.

    Could you let me know if you had to go through any EMI issues in the past with either TI or non-TI isolators?

    Regards,
    Koteshwar Rao