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ISO7740: IEC/EN61000-4-5 and IEC/EN61000-4-4 requirements

Part Number: ISO7740
Other Parts Discussed in Thread: ISO7762,

Hi, 

We are currently working on a design that is using ISO7740 and ISO7762 to create a 3kV isolation barrier. The requirement spec we must meet references IEC/EN61000-4-5 (surge) and IEC/EN61000-4-4 (fast Transient) test methods. There is no specific mention in the datasheet about these standards, only a mention about the EMC robustness. "the ISO776x family of devices has been significantly enhanced to ease system-level ESD, EFT, surge, and emissions compliance."

Can you advise if these devices are suitable for the standards mentioned? Is there some test data you can share to back up the statement?

Thanks, 
Jose
We’re currently working on the project to design custom multiport serial comm card with 3kV isolation. To create the isolation barrier we selected two parts from your digital isolator series: ISO7762F and ISO7740F. The requirements spec we must meet references IEC/EN61000-4-5 (surge) and IEC/EN61000-4-4 (fast transients) test methods. There is no specific mention in the parts datasheet about these standards only a casual statement about their EMC robustness:
the ISO776x family of devices has been significantly enhanced to ease system-level ESD, EFT, surge, and emissions compliance
 
Can you please advise if these parts are suitable for the standards I mentioned? Is there some test data to back up the above statement?

  • Hi Jose,

    Thank you for posting to E2E! Tough they are not specified for IEC/EN61000-4-5, VDE certifies surge performance as Viosm = 8kVpk for reinforced ISO77xx devices, including ISO7740 and ISO7762, and they are capable of even higher performance since the certification includes margin. EFT (IEC/EN61000-4-4) is a system-level test, and we have some data available in this tech note (SLLA524). More information on surge testing and our surge specifications can be found in white papers SSZY028 and SLYY063.

    I will write to you directly and share some additional information.


    Have a great weekend,
    Manuel Chavez