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OPA172: Not a rail to rail part after all.

Jim Pitman
Intellectual 390 points
Part Number: OPA172

Even though the part is advertised a s a rail to rail output op amp, it is not. The output does not get to the positive rail.

TI, you wasted my time.

  • 0
    TI__Genius 12340 points

    Hi Jim, 

    What is the output swing requirement for your application? For all of our op amps, there will be a voltage swing to the rail specification that shows we have some headroom from the positive and negative supply rails. This also changes depending on your output current load. We can help to find an alternative op amp if the OPA172 doesn't meet your requirements. 

    Thank you!
    Best Regards,
    Ashley

  • 0 in reply to Ashley Kang
    TI__Mastermind 18987 points

    Hey Jim, 

    We also offer a training on ti.com to better understand the output swing limitations of all op amps. Here is the link to the video. 

    Here is the output swing for the OPA172: 

    The input limitation is: 

    Could you please confirm the input signal? It is likely that the nonlinear behavior is presenting at the output but might be caused by the input. See the following training: Link

    All the best,
    Caro