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TM4C1294NCZAD: Trouble on a specific s/n

Part Number: TM4C1294NCZAD

We have been using the TM4C1294NCZADI device for a couple of years, but in the last production of 200 cards we found a problem: we are trying to understand if it is something related to the production batch that is identified with the serial number 95AO7UW

  • Hello Antonio,

    I have not heard of any serial number related issues, but if you would like us to look into possible production lot data I would need an image of a device to get the date code markings.

    Also it is critical to understand what issues you are facing. Whenever reviewing production batch data, we would need to analyze the specific device feature(s) that are seeing an impact to be able to provide any meaningful feedback. 

    Best Regards,

    Ralph Jacobi

  • In the meantime, thank you for your reply and your interest.

    Here the trouble as described by enineering staff: "The problem seems that the software is not loaded correctly and so it doesn't "start".Replacing the component with another micro-processors from different batches, solves the problem. With an harwdare "Reset", the chip still does not works. With a software "Reset" by the emulator (connected to the board) it works. Putting pin PE0/AIN3/U1RTS in position H3 to 3v3 with pull-up it works good."

  • Hello Antonio,

    Thank you - I submitted a query out regarding the lot information now, but I got two further questions from the team:

    1. Where were these units sourced from (i.e. which distributor, from TI, etc.)?
    2. Can you send a serial number for a working device as well so we can compare the working vs failing lots?

    Best Regards,

    Ralph Jacobi

  • Hello Ralph, many thanks again for the support.


    At the moment I have several s / n of working lots that I can report: 8AAFI2V - 76AQJ6W - 9BC4EIW - 22ATSPW - 22ATSQW.

    The problem of provenance is a bit complex ..... The moment, as we all know, is difficult: in order not to stop production, you go to look for material in any place that you consider reliable! We made purchases from distributors (ARROW, AVNET, DIGIKEY, MOUSER), but also from brokers, generally with good results: in this specific case, the malfunctioning device does not come from distribution ...

    Best regards

    Antonio Origgi

  • Hello Antonio,

    Thanks for the added details here. I looked into the lot number you provided which could be either 95A07UW or 95AO7UW and after reviewing with our quality team, we cannot find any lot information for that.

    Given the issue displayed, the source of the material, and the absence of any historic lot information, we believe that the batch of units with that lot code are not genuine TI parts.

    Regarding the codes you have provided - I have validated that 76AQJ6W / 22ATSPW / 22ATSQW are valid lot numbers.

    For 9BC4EIW, that did not pull a result but when I checked 9BC4E1W, that did - so maybe verify the I vs 1 possibility on that lot.

    Meanwhile I could not validate 8AAFI2V as a legitimate lot number - is that the correct number? I vs 1 or V vs W could be differences. If it is correct then we cannot validate it.

    Best Regards,

    Ralph Jacobi

  • could not validate 8AAFI2V

    Hello Ralph,

    you're right: I've personally checked this item and, really, the p/n is 8AAF1ZW.....

    units with that lot code are not genuine TI parts

    So apparently we weren't lucky for this purchase ...... What a pity! However, it seems that we can use all the pieces, with that "trick" I wrote about above; as I write this, we are testing about 20 cards: we will see what the success rate will be.

    Many thanks for your help.
    I hope I can disturb you again, if we need to: actually, I really hope not ...... !!!

    Best regards,

    Antonio Origgi

  • Hello Antonio,

    I didn't think of 2 vs Z... I checked 8AAF1ZW and can confirm that is a valid lot number as well!

    Best Regards,

    Ralph Jacobi

  • Hello Antonio,

    Here is some additional information for you (and any other community members) regarding potentially counterfeit devices:

    Procedure:
    All inquiries related to counterfeit material verification should be sent to ti-counterfeit@list.ti.com.

    Required information
    1. Completed Counterfeit Request Form (Attached at bottom of post)
    2. High-quality pictures of the bottom & top of the device(s) and of the bar code label
    3. Copies/pictures of shipping documents, i.e. packing slip showing the origin of the devices to TI or an authorized TI distributor.

    Once the required information is provided to ti-counterfeit@list.ti.com, TI will review the request for verification.
    Important Note: The total attachment size limit for the group address (ti-counterfeit@list.ti.com) is 1MB. If needed, please sent multiple emails when exceeding this size limit.

    Counterfeit Validation Form.pdf

    Best Regards,

    Ralph Jacobi