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INA138: Higher accuracy current sense amplifier

Lenna Yan
Intellectual 1960 points
Part Number: INA138
Other Parts Discussed in Thread: INA215, INA293

Hi expert,

Do we have a INA138 pin to pin device that has higher accuracy? 

Total current error requirement: <50mA

Power supply: 5V Vcc 

Common mode voltage: > 20V

Sense current: 5A(max)

Sense resistor: 5 mOhm or 10 mOhm

I see the accuracy of INA215 is much better. Is this a good choice if the customer can accept a not pin to pin device?

  • 0
    TI__Mastermind 32395 points

    Hey Lenna,

    The INA13x/INA16x family is the only  current-output family in our selection so there technically is no true replacement. However, the INA293 family is pin-to-pin compatible, it just outputs the measurement as a voltage. It comes in gain variants of 20, 50, 100, 200, and 500 V/V so if you could use one of these gains I would look at this device.

    If you need an adjustable gain, current-output solution, you could look into making this circuit: http://www.ti.com/lit/an/sboa358/sboa358.pdf

    Hope this helps.

    Best,

    Peter