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ISO7721: ISO7721 SOIC-16 DW package and ISO7821 SOIC-16 DW package

Howard Zou
Genius 12365 points
Part Number: ISO7721
Other Parts Discussed in Thread: ISO7821

Hi,

It seems that the only difference is Withstanding isolation voltage. ISO7821 is 5700 VRMS, ISO7721 is 5000 VRMS. right?

Besides, for ISO7721 itself. DWV(8) package is 8.5mm clearance and creepage, DW(16) package is 8mm clearance and creepage. But their body size width are the same, why they have different clearance and creepage?

  • 0
    TI__Genius 17100 points

    Hi Howard,

    Along with current consumption per channel and package options, yes, the primary difference between the ISO7721 and ISO7821 is the isolation rating.

    Please allow me to confirm some details regarding clearance and creepage parameters and follow up with you in 1 - 2 days.


    Thank you for your time,
    Manuel Chavez

  • 0 in reply to Manuel Chavez
    TI__Genius 12365 points

    Manuel, 

    Since VIOTM, VIOSM, VIORM are the same between ISO7721 and ISO7821 SOIC-16 DW package.

    It seems that ISO7821 SOIC-16 DW package is not very competitive compared with ISO7721 regarding higher price. I haven't met a customer who only need higher Withstanding isolation voltage to 5700VRMS.

    Can I conclude that regarding SOIC-16 DW package, I only need to promote ISO77xx?

  • 0 in reply to Howard Zou
    TI__Genius 17100 points

    Hi Howard,

    The ISO7821 in either package may be chosen by customers with specific requirements and higher isolation voltage needs. Most customers find the ISO77xx devices to fit their requirements, so this part can be largely recommended. Please do confirm customer needs on a case-by-case basis and feel free to post on E2E in the future if there are any doubts.

    The creepage and clearance differences between the ISO7721DWV and ISO7821DW come from the distance across the isolation barrier measured along the surface of the device, as shown in the image below. In this case, the difference between 8mm and 8.5mm is acceptable for customers trying to meet the same voltage ratings of both devices.




    Thank you for posting to E2E,
    Manuel Chavez