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INA139-Q1: INA139QPWRQ1

Fabio Sepulveda
Prodigy 10 points
Part Number: INA139-Q1
Other Parts Discussed in Thread: INA190-Q1, INA139

Tool/software:

We are finding output values below the calculation and a variaton between diferent lots of INA, is this an expected condition?

  • 0
    TI__Expert 3475 points

    Hi Fabio,

    The INA139-Q1 has a max offset of +/- 2mV and with a gain of 27, your offset is going to be +/- 54mV. Thus any value that is 94 +/- 54mV is within range.

    If you're looking for a part with better accuracy, I would suggest the INA186-Q1and INA190-Q1.
     
    Best,
    Mallika Senthil

  • 0 in reply to Mallika Senthil
    Prodigy 10 points

    Thank you Mallika

    Are there another one with better accuracity but the same package (INA139)? if not we will try increase the shunt and reduce the gain to improve it.

  • 0 in reply to Fabio Sepulveda
    TI__Expert 3475 points

    Hi Fabio,

    Unfortunately we don't have any pin-compatible devices for INA139, increase shunt and gain should help resolve the issue to an extent.

    Best,
    Mallika Senthil