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ISO224: Technical queries on ISO224B

Part Number: ISO224

Hi Team,

My customer has the below queries on ISO224B. Please help in clarifying the same.

1) As per data sheet absolute maximum voltage for primary side power is 26V. What happens when we exceed this voltage? What kind of failure happens inside IC? Will failure in primary side effect circuits in secondary side of isolation amplifier?

2) We have inadvertently given a voltage of 65V to primary side power and IC had failed. We have decided to replace the IC as well as the input side bypass capacitors. Is there any chance for this voltage to propagate to secondary side? We are using 50V rated capacitors. Should we change the secondary side bypass capacitors also?



  • Hi Jash,

    You shouldn't exceed the absolute maximum ratings of the device.  Damage will occur on the side where the absolute max spec is violated, but it shouldn't propagate across to the other side.  The isolation barrier should protect the other side from seeing any electrical overstress, although the device may not be functional anymore.  For more information on the isolation failure modes you can refer to slyy081b.