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creepage and clearance distance of ISO7220M

Expert 2750 points

Replies: 6

Views: 1070

Hello Team,

Could you tell me the reason why creepage distance of ISO7220M is shorter than clearance?

I Ithink creepage > clearance because the shortest path of creepage is found around the end of the package body.

Best Regards,

Hidetoshi Matsunami

  • You are correct. Creepage should be equal or greater than Clearance.

    I'll fix the datasheet error.

    Saleem Marwat

    System Engineer

    Isolation Products, Texas Instruments

  • In reply to Saleem Marwat:

    Hello Saleem,

    Thank you for your reply.

    What's the rating of creepage for ISO7220M after fix the datasheet error?

    Is it 4.8mm just like clearance distance?

     

    I found same datasheet error at the below devices.

    • ISO721
    • ISO7220A-Q1
    • ISO7242C-Q1
    • ISO7421A-Q1

    Are these also the datasheet error?

    Best Regards,

    Hidetoshi Matsunami

  • In reply to Hidetoshi Matsunami:

    Hello

    I'd like to ask you additional question.

    I understood about Clearance and Creepage distance after the board mounting as the following but is this correct?

    Is it possible that creepage distance of ISO7220M is shorter than clearance if my understanding is correct?

    Best Regards,

    Hidetoshi Matsunami

  • In reply to Hidetoshi Matsunami:

    Matsunami-san,

    In your example, Clearance distance will be equal to the lower Creepage distance because there is air just above the surface of the PCB.

    Clearance is either equal or less than Creepage; always.

    Saleem Marwat

    System Engineer

    Isolation Products, Texas Instruments

  • In reply to Hidetoshi Matsunami:

    Both Clearance and Creepage will be 4 mm.

    Saleem Marwat

    System Engineer

    Isolation Products, Texas Instruments

  • In reply to Saleem Marwat:

    Hello Saleem,

    I understood it.

    I appreciate your support.

    Best Regards,

    Hidetoshi Matsunami

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