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OPA2140: Current consumption for overloaded inputs

Elder Costa17
Expert 2825 points
Part Number: OPA2140
Other Parts Discussed in Thread: OPA140, OPA191

I would like to know if there is any information about current consumption (assuming unloaded outputs) when OPA2140's inputs are beyond the normal operation range, especially closer to the positive range (i.e. above (V+)-3.5V). The data sheet have information about this part not having phase inversion when inputs are overloaded, which is good. However I would also like to know if the current consumption behavior is also predictable.

Many aaeons ago I used a part (C-MOS AFAIR) whose supply current increased significantly when inputs were beyond the linear Vcm range. I just want to make sure that is not the case with the OPAx140 as my application requires a good behavior under such circumstances.

  • 0
    TI__Genius 15550 points
    Hi Elder,

    In general, for rail-to-rail output op amps with a bipolar output stage (including the OPA140), Iq will increase as the outputs are driven harder and harder into the rails. In the case of a noninverting buffer, this would also result in the input common mode approaching the positive rail.

    If this is an issue, it may be worth considering a CMOS device like the OPA191 as an alternative.