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Original question:

MC33078: MC33078DR burnt issue

MC33078: datacode

Alessandro Menozzi
Prodigy 10 points
Part Number: MC33078

Tool/software:

Hello, 

I'm looking for any info can help me how to recognize the datacode on the MC33078DR chip.

We are some faulty op amps we are investiganting on.
On the same design we se different brand of IC, all the faulty op amps are TI brand and it would be helpful to find out whether these are from a specific production batch/date.

e.g. what info can we get from the following IC marking?

thanks

  • 0
    TI__Genius 11880 points

    Hi Alessandro, 

    Do you have the TI reel label? This will have the full lot traceability information. Otherwise, datecode (YM) is listed on the second line next to "TI", so it is "33" or 2023, March. 

    Could you explain more on what the issue you are seeing and how many devices are impacted?

    Regards,
    Ashley

  • 0 in reply to Ashley Kang
    Prodigy 10 points

    Hi Ashley,

    Thanks for your reply.

    Do you have chance to share with me the full transcode table for the datecode? how it happears in case of October 2023?

    We are experiencing very high failure rate from the field, on different designs, some of them in production since more than 10 years.

    This issue has been never experienced before with other brands of IC (ST, ONsemi) 

    We estimate the faulty rate is more than 1% after a few months from the delivery to customers; I don't have the reel label (we are now in contact with our PCBA supplier) but it looks all the defective IC are from the same production datecode "33"

    at the moment we remove TI from the approved IC list

  • 0 in reply to Alessandro Menozzi
    TI__Genius 11880 points

    Hi Alessandro,

    For October 2023, it would be "3A". The last three months of the year is denoted by "A", "B", "C" respectively. 

    Have you submitted a customer return request for further investigation or analysis? We have a return portal and our quality team can support further: https://www.ti.com/support-quality/additional-information/customer-returns.html 

    In the meantime, if you share any schematic or application information (bias conditions, input/output stage, etc), we can help to review them in this thread and see if there is any possible reason for the failures. 

    Please let me know if you have any questions.
    Thank you!

    Regards,
    Ashley

  • 0 in reply to Ashley Kang
    Prodigy 10 points

    Hi Ashley,

    thanks for feedback.

    We've already retunred a few faulty IC to you through our supplier of PCBA, we are waitign for your analysis result and report.

    The fact is that these IC are used on different PCBA, some are in production since many years with IC from your competitors and we've never experienced this type of issue before we started using TI.

    In the meantime we found also bad IC from 2023 May (datecode "35").

    We note these ICs does no longer have the traditional TI logo, it was on the ICs till a few years ago.

    Are these from different production plant? please share with us the history change of this part numnber

    e.g. here an IC from 2022, May - TI logo was present

  • 0 in reply to Alessandro Menozzi
    TI__Genius 11880 points

    Hi Alessandro, 

    Could you go into more detail on what is the failure mode? Or if you have the CPR or QEM number that was given from the quality team when the return request was submitted I can look into it as well. 

    The marking change is normal - TI issued a PCN in 2022 explaining the symbolization change. There was no change in production flow or manufacturing site. Please see a copy of this PCN that is on Mouser's website: https://www.mouser.com/PCN/Texas_Instruments_PCN20211123004_2022022410013610.pdf 

    Regards,
    Ashley