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SN75176B: Overvoltage (+24V) applied to SN75176BDR

Tomonori Seki
Prodigy 10 points
Part Number: SN75176B

Hi Support Team.

Please teach me.

The user may have mistakenly applied overvoltage (+24V) to pins 6 and 7 of the SN75176BDR.

In that case, I would like to know if there is a possibility that overvoltage (+24V) will be applied to other parts connected to 1pin and 4pin of SN5176BDR.

  • 0
    Guru 243870 points

    That might be possible. When you exceed the absolute maximum ratings, there are no guarantees.

  • 0
    TI__Mastermind 22825 points

    Tomonori-san,

    While it is correct to say there are no guarantees when a device exceeds absolute maximum ratings, I would find that particular failure mechanism very unlikely. Given the design structure of this device, I would expect that the only way for a 24 V input to A/B to be passed along to D/R would be if there were permanent electrical overstress (EOS) to the device that created a low-impedance path between the bus pins and the logic pins. One way to look for this would be to apply +15 V to A/B and measure if the +15 V is shown on pins 1 and/or 4.

    As Clemens said, nothing is absolutely guaranteed when held in conditions outside the absolute maximum ratings. That also means that there is no guarantee of failure.

    Best,

    Danny