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INA241B: INA241 NC PIN

Harry Ma
Intellectual 2040 points
Part Number: INA241B

Tool/software:

Hi Team

Customer uses INA241B as the output current sense. The schematic is shown as following, the output voltage is 48V. they found the INA241B output is abnormal after applying the 8.8KV ESD test on output GND4. they tried the "ABA" test and found the issue following the IC.

and customer doesn't not connect the NC pin to GND. is it mandatory that NC PIN connecting to GND or it can be floating? 

  • 0
    TI__Mastermind 29710 points

    Hello Harry,

    Normally if left floating it is not an issue.  If there is a voltage that is applied to it, it should be connected to GND.  

    What is the difference from GND3 and GND4?   Placing ESD on GND4 is the same as GND3?  How are they isolated.

    I would only see and issue if the ESD event was on the NC pin.  Then I would recommend connect to GND and not float.  If the ESD test is not done on the NC pin it should not be an issue to float. 

    Regards,

    Javier

  • 0 in reply to Javier Contreras4
    TI__Intellectual 2040 points

    Hi Javier

    We tried connecting the NC to GND, but ESD still will make the INA241 output abnormal, which will not indicate the input current properly.  how does NC be connected internal?

  • 0 in reply to Harry Ma
    TI__Mastermind 29710 points

    Hello Harry,

    This pin is connected internally but not used.  You should not see any issue if the pin is connected to GND.  I talked to our design and they confirmed there are ESD diodes on the pin that will not allow the voltage to go below the GND pin.

    Regards,

    Javier Contreras