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OPA1602: Checking part from different lot

Adrian Marcelo Gonzalez
Prodigy 90 points
Part Number: OPA1602

Hi everyone,

this is a quick question regarding this OPA.

The situation is as follows: I have a considerable steady equipment production with these OPA1602, however, from the last lot of components that I have received, I clearly identified differences and test failures with this new lot order. I need to confirm if there are significantl production differences from the chips that I show in the images.

With the chip from image A, the equipment works properly, however, with the chip from image B, it DOES NOT.

Does someone from TI can give me some advise on this issue?

IMAGE A

IMAGE B

Thanks in advance for your support.

Adrian

  • 0
    TI__Expert 6250 points
    Hi Adrian,
    There should not be any significant production differences between the two lots. It is possible that if the original design was marginally stable, that small variations lot-to-lot could be causing the issue. If you'd like, we can take a look at your design to see if there are any trouble spots that could be responsible for this.
  • 0 in reply to Alexander Davis
    Prodigy 90 points
    Hi Alexander,

    first of all, thanks for your reply. The situation is as stated originally: I replaced the new "wrong" versions of OPA to the oldest ones that I still have, and the issue is gone.

    My team and I are clearly sure that the issue is due to this new lot. However, we cannot see why coult it be.

    Unfortunately for us, we have a big amount of chips with the same description, and for consequence the same lot...

    Thanks again for your new research and reply.
  • 0 in reply to Adrian Marcelo Gonzalez
    TI__Expert 6250 points
    Hi Adrian,
    What exactly is the issue you are seeing with the newer lots? What symptoms does the system exhibit?
  • 0 in reply to Alexander Davis
    TI__Expert 6250 points

    Adrian,

    Rereading my first reply above, I realized I worded a section of it poorly. The section that reads "It is possible that if the original design was marginally stable, that small variations lot-to-lot could be causing the issue" should instead read "It is possible that if your design is marginally stable, small variations lot-to-lot could be causing the issue".