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OPA129: Differences from OPA128

Sarah Katz
Prodigy 25 points
Part Number: OPA129


Hello,

I've noticed that the OPA129 and OPA128 performance as spec'd on their datasheets is very similar.  Is the different package (SOIC vs TO99) the primary difference between the parts, or is the design of the die also different?

Thanks,

Sarah

  • 0
    TI__Guru* 93105 points
    Hi Sara,

    Certainly the packages are a big difference; the OPA128 in the older TO-99 metal package, and the OPA129 in more modern plastic packages. If you compare their datasheets closely there are a number of differences in their specified limits for parameters such as voltage-offset, operating current, noise , etc. It is TI's policy not to disclose information so specific such as the die used in a particular product.

    Regards, Thomas
    Precision Amplifiers Applications Engineering
  • 0 in reply to Thomas Kuehl
    Prodigy 25 points
    Thomas,

    Thank you, I did notice those differences. Some of our design engineers have specified the OPA128 in their designs, and I am trying to determine if any of the test data we have from a previous use of the OPA129 is applicable to the OPA128. I would be happy to take this discussion over to email and go into greater detail.

    Sarah
  • 0 in reply to Thomas Kuehl
    Guru 140200 points
    Hi Sarah,

    as Thomas allready mentioned, the two OPAmps come in different packages. And the OPA128 is quite a bit more precise compared to the OPA129. Me thinks that the OPA129 is a low cost version of OPA128, or can at least be treated like that, as the specifications are rather similar.

    Kai
  • 0 in reply to Sarah Katz
    TI__Guru* 93105 points
    Hi Sarah,

    If the OPA129 is employed in place of the OPA128 in your established circuits the electrical performances should be very close, with the exception of the noted electrical specification differences.

    If you need to discuss this further off-line, go ahead and make an E2E friend request so that I can contact you via your company email.

    Regards, Thomas
    Precision Amplifiers Applications Engineering
  • 0 in reply to Thomas Kuehl
    TI__Genius 11135 points
    Sarah

    We haven't heard back from you so we assume this answered your questions.

    Thanks
    Dennis