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Unusual Amplifier leakage

Andy Chernock
Intellectual 740 points
Other Parts Discussed in Thread: INA117

My customer wrote:

We are using the INA117 in one of our products and we have a small number of very unusual failures.

 

The differential amplifiers are used to measure individual cell voltages in Nickel-Cadmium batteries where the highest common mode voltage is less than 80V.

In a very small number of cases (out of 3000 amplifiers in service since 2001) we have observed a very high leakage on the front end. This becomes evident when the circuitry is connected to a resistive test circuit (source resistance under 200 ohms) and the amplifier with leakage disturbs the voltage set by the divider.

In two cases, we had the amplifier actually burn up.

Are these isolated cases? Are there any conditions where the amplifier is vulnerable?

=================

Thank you,

Andy Chernock

  • 0
    TI__Mastermind 25775 points
    Hello Andy,

    My intuition leads me toward ESD since the device has a very large common-mode input range (though I don't know if you're supplying it with +/-15V). If not, perhaps it is an electrical overstress (EOS) event.

    Nontheless, I recommend submitting the device(s) for a failure analysis (FA). Please let me know if you need assistance with this.