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THVD2450: Mixed lot trace code in marking

Peter Chur
Prodigy 70 points
Part Number: THVD2450


Tool/software:

Hi ti support,

We have purchased this device from ti store which sales order no is T02878867.But we noticed that this batch of material contains mixed lot codes randomly distributed.As shown in the attached image, there are at least four different lot codes in this tape: AHC5, ADJC, ADJF, AHC1.

Could you help to check if this is a normal phenomenon?

If possible, we would also like to understand why this batch is so unique? As we have not encountered such a situation before.

Thank you

BR

Peter

  • +1
    TI__Guru* 76771 points

    So each assembly site at TI basically has their own rules for how they do their lot trace codes (the third line of the markings)

    Peter Chur said:
    Could you help to check if this is a normal phenomenon?

    Based on the second line, it looks like some of the devices in the reel are from a different month. The first number is 2024. 3 is for March and 4 is for April. It looks like you got units that were made at the end of March and the beginning of April which were packaged together in the reel which is why you're seeing more variation in the lot trace codes. 

    I've had another customer ask this a few weeks ago and I was able to confirm while this is a little uncommon, it does happen and is normal. 

    -Bobby

  • 0 in reply to BOBBY
    Prodigy 70 points

    Hi Bobby,

    Thank you for your explanation. It turns out that the LTC rules at the CDA assembly site are quite uncommon.However,I still have a minor question:the date code 2216 on label is actually not located at the end of March and the beginning of April.

    Thank you.

    BR

    Peter

  • 0 in reply to Peter Chur
    TI__Guru* 76771 points

    Hi Peter,

    I did make a slight mistake on my original post, The first number is the year which should be 2022. (Not 2024)

    The date code on the reel 22 = 2022 and the 16 = 16th week of the year which would be mid April (18th to 24th).

    I spoke with a project manager and was able to confirm that the date code on the reel may not match the date code on the top marking of the device. The top marking is when the device was created (think of it like you can physically pick it up and put it on a board if you wanted). But after it's created it usually will sit until it goes through the final test (we do continuity checks and verify some specs that are called out on the datasheet, not all but ones we think are crucial). Sit time is usually a week but can be longer. I think TI has now implemented (don't quote me on this) a rule where if parts are sitting for more than 60 days, they will throw them out so theoretically it could sit for a little over 2 months. The date code 2216 is the date the devices finished going through test and have officially been put in the reel. So this date code MUST be the same month or later than the date that is on the top marking. 

    -Bobby

  • 0 in reply to BOBBY
    Prodigy 70 points

    Noted with thanks Bobby

  • 0 in reply to BOBBY
    Prodigy 70 points

    Hi Bobby,

    Final confirm with Bobby that have you noticed the high number of LTC in this reel and their disorganized distribution?By the way,Could you help to verify if the specific LTC (AHC5,ADJC,ADJF,AHC1) all originate from the STC(7812924ZCE)?

    Thank you.

    BR

    Peter

  • 0 in reply to Peter Chur
    TI__Guru* 76771 points
    Peter Chur said:
    Final confirm with Bobby that have you noticed the high number of LTC in this reel and their disorganized distribution?

    Yes, at the test site there are multiple batches that are typically lined up. The units being loaded from the tester don't need to have them come from the same batch. This is usually more common when production for a device begins (when we release to market). 

    Peter Chur said:
    Could you help to verify if the specific LTC (AHC5,ADJC,ADJF,AHC1) all originate from the STC(7812924ZCE)?

    I've talked with our project manager but it seems like this kind of look up is very difficult (they had to attempt this a few years ago).

    Is there any specific reason you're looking to verify this? If these units came from the TI store, they should be legitimate. 

    -Bobby

  • 0 in reply to BOBBY
    Prodigy 70 points

    ok noted with thanks