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SN65HVD10: 32V on inputs to this opamp

Justin Gong
Prodigy 10 points
Part Number: SN65HVD10

I have a question regarding input protection on the SN65HVD10D opamp. We experienced an event where the input voltage (D and DE) was 32V for an unknown, but short amount of time. This opamp was powered by a power supply with a 1A OCP setting, and during this event there was also a hard short to GND. Presumably, the 1A OCP was triggered and the power supply shut off, but not before the inputs on SN65HVD10D were powered on at 32V. Is there input protection on this opamp that's not listed in the datasheet? Are there ESD diodes on the input that would help to sink current in an overvoltage event, like the one described above? What effects would we expect to see as a result of high voltage on those inputs? Thanks and appreciate the help

  • 0
    TI__Mastermind 25705 points

    Hi,

    I'm not sure I understand what is shorted to GND. Is it a pin of SN65HVD10? Another question is how long the 32V presents on the D/DE pins. These digital pins are rated with 4kV HBM and 1kV CDM protection. Depending on the transient events, the internal ESD probably would be triggered by any voltage above 6.5V.

    Regards,

    Hao