• TI Thinks Resolved

ISO1500: failsafe protection

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Replies: 1

Views: 31

Part Number: ISO1500


  • The datasheet claims failsafe protection on the bus pins for “open, short, and idle” conditions.  Does the “short” condition include shorts to 24V, or only between the bus pins themselves?  The datasheet implies the latter (unfortunately).
  • If 24V bus short protection is NOT supported, do you have a recommended external protection solution?  I was thinking a Zener on each bus pin might work, but I want to confirm.



  • Hi Viktorija,

    Thank you for reaching out to us.

    We recommend to use a SIDAC and PTC for high voltage electrical over-stress as shown in the below figure.

    Please refer to this design guide for further information on SIDAC and PTC.


    Alfred Chong