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INA381: Unused pin.

Part Number: INA381
Other Parts Discussed in Thread: INA181, INA180, LMP8481, LMP8480

Hi team,

What should I do to unused ALERT pin?
OPEN? pull-up? GND?

If ALERTpin connected to GND, are there any problems?


  • Hello Kengo,

    Thanks for considering to use Texas Instruments.  According to the datasheet the preferred connection is pulled-up to supply with a 10kΩ.  However, the datasheet does mention that the comparator has an open drain output.  Therefore, shorting the ALERT pin to gnd should be fine as a mosfet typically has high impedance from gate to drain and gate to source. If the gate to the comparator's output is triggered, you would just have a short from the drain to the source, which would both be at the ground potential.

    As you are not using the comparator, I think it might be worthwhile choosing another part as that feature does add some cost.  I checked our parametric table here and saw that we have several parts with similar specs excluding the comparator that cost less.

  • Hi Patrick,

    Thank you so much for your reply.

    Do you have recommended another device with ultra-low Iq?
    I think INA180 and INA181 are better.


  • Hey Kengo,

    You might also check out the LMP8480 and LMP8481.  The Iq for those parts should be even lower.