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Original question:

OPA379: What is the EMI performance in respect to the LMV831?

OPA379: LMV831

roger schenk
Prodigy 40 points
Part Number: OPA379
Other Parts Discussed in Thread: LMV831, LMV832

I am wonder if there is now EMI hardening data (OPA379)  that would rival the excellent performance of the LMV831. Such as the referenced thread discuses with the OPA379.  Is there a lower power consumption device out there that has competitive specifications to the LMV831, but consumes less electrons? We have traditionally used the LMV832, but now find we have to find a lower current consumption per channel part, and of course want the other great performance specs of the LMV831/2.

  • +1
    Guru 140200 points

    Hi Roger,

    the OPA379 offers a bandwidth of only 1/66 of the bandwidth of LMV831. I don't think that you can simply replace the LMV831 by the OPA379 in your circuits. And the 0.25mA current consumption of LMV831 is very small for a 3.3MHz OPAmp.

    You would need to tell us the bandwidth or your circuits, the gain, the output load, the noise demands, and so on, just everything to decide what OPAmp could replace the LMV831.

    And when it comes to the EMI hardening data, let me tell you that it's the standard design measures which decide how much EMI can be handled by a OPAmp circuit. There's no alternative to shielding, grounding and filtering. This internal EMI filtering only works at frequencies above 10MHz. Below 10MHz the OPAmp is entirely unprotected, unless standard design measures are used like shielding, grounding and filtering.

    Kai