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INA138: INA138NA power supply voltage

Part Number: INA138

I am considering using INA138 for current measurement in my application. I want to use 3V3 to supply (VS) and monitor a 6V rail as in the figure below. Can I use a supply voltage lower than the voltage I am monitoring? There is any risk of the OUT pin voltage exceed 3V3?

  • Hello user,

    There is no problem to do this, in fact the device was designed to operate this way. There is no risk of the OUT pin voltage exceeding 3V3 because of the current applied to the input. The device will clamp its output voltage based on the voltage output swing limit spec in the datasheet. However, if an external circuit connects voltage > 3V3 to the OUT pin, then the part could become damaged.

    Best regards,

    Ian Williams
    Applications Manager
    Current Sensing