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INA210: INA210

Part Number: INA210

Hi TI team,

We are using a current sense IC (INA210CIDCKT) in our design. We have seen multiple failures of these parts while testing, and wanted to understand what could be a possible failure mode of these parts when the input pins can expect a negative voltage from (-0.8V to -2V for a period of less than 100nS). If I were to check impedance b/w the pins of this part, impedance across which two pins can indicate that it has failed because of negative voltage.

Also, to add we have assembled our PCBAs in batches without change in design...but the first 2 batches did not exhibit in any such failures and the recent batch almost all the ICs failed. When I check impedance of input pins and output pins w.r.t gnd, all the impedances seems to be more than 100 Kohm.

In one of the instances, we saw the output and input pins failed shorted....What could be a possible reason for the same?

Can you please help us to answer some of the above questions and how to confirm whether the IC is failing because of negative voltage at the input pins and can there be any other failure mode which we are not able to catch.

Also, attaching the waveform of one of the negative voltage which we captured. (blue line indicates the voltage on input pin)

  • Hi,

    When input voltage exceeds the absolute max ratings (above or below), a common failure mechanism is for the input ESD protection to break, and shorting to ground is yet one of the common symptoms of a catastrophic ESD failure.

    As you suspected, many factures play into whether the failure manifest itself immediately after experiencing an over-voltage event. Semiconductor process variation, PCB variation and use condition can all contribute to how soon a device fails. From manufacturing process alone, it is common to see variation even for material from the same lot. The device is therefore specified conservatively considering such variations, that’s why most will survive for voltages exceeding the specified ratings. But such use condition is not recommended, and should be avoided, due to reliability concerns.  

    At this link, you’ll find a number of analog output current sense amplifiers that can withstand common mode input voltage down to -2V and lower.

    Regards, Guang