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INA186: short circuit between IN- and GND

Gustav Vierbergen
Prodigy 10 points
Part Number: INA186

Hi, 

I trust you are well.

We recently encountered an issue. One of our boards utilizing the INA186 was returned due to a short circuit measuring approximately 20 ohms between pin 8 (IN-) and pin4 (GND). There is a possibility that another board might be experiencing a similar issue, although we are currently awaiting its return for a thorough inspection.

To diagnose the problem, we removed the chip to conduct measurements, intending to discern whether the short circuit originated within the chip itself or elsewhere on the PCB. Our findings confirmed that the issue indeed lies within the chip.

Our primary focus now is to investigate the root cause of this anomaly. Understanding what leads to such occurrences is crucial for us to implement design modifications that will prevent this issue from recurring in future iterations of our boards. 

Unfortunately, due to confidentiality concerns, I am unable to share schematics on a public forum.

  • 0
    TI__Mastermind 30850 points

    Hi,

    This type of open/short usually indicates damage to the ESD block of the pins. Aside from ESD events, either over or under voltage events can be the cause.

    The absolute max common mode range is -0.3V to 42V. It is a good idea to inspect the input common mode voltage to make sure it is within this range, for all operating modes. For applications such as motor drive, this is important because of the possibility for the device to experience switched common mode.

    Regards, Guang