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Part marking

James Colpitts
Prodigy 70 points
Part Number: DS26C31T

U13 in image below, shows a National Semiconductor DS26C31TM with part marking "65CCYDUE0". 

Date code on received paperwork is 1619.  I understand in the part marking, "65" is wafer fab and assembly plant as shown but how to decode the date code?  Please provide some documentation as this problem  occurs frequently.  Also have a device with marking "55AYK8UE0" that needs decoding.

  • 0
    TI__Guru 62920 points
    Hi James,

    Can you point me to where the topside marking decoder you copied above came from? I wonder if it may be out of date. I pulled the symbolization documentation I have for this part and it says that the first two digits following the National logo represent a year/month date code. That would mean that 65CCYDUE0 would decode to May 2016 and 55AYK8UE0 would decode to May 2015.

    Regards,
    Max
  • 0 in reply to Miguel Robertson
    Prodigy 70 points

    Not sure how to attach a file here.  When I use the paper clip, it inserts an image.  Can you supply the documentation you refer to?

  • 0 in reply to James Colpitts
    TI__Guru 62920 points
    Unfortunately I cannot; it is from an internal database that lists manufacturing info, supplier info, etc., and is considered confidential.

    For attaching a file, the paperclip icon should be the way to go. It should insert a default icon when you attach a file that turns into a clickable link once posted. If that doesn't work, though, I could send you a note via email to your myTI account's email address if you're OK with that.

    Max
  • 0 in reply to Miguel Robertson
    Prodigy 70 points

    devicemarkingconventions.pdfI've tried attaching the file on part marking conventions.  But can you tell me the format of the marking that you are referring to?

  • 0 in reply to James Colpitts
    Prodigy 70 points

      Need part marking format for part marked as:  National logo 65CCYDUE0

  • 0 in reply to James Colpitts
    TI__Guru 62920 points
    Hi James,

    The attachment was successful. I'm trying to understand if the topside naming convention defined in this document may have changed for this sometime after TI acquired National Semi (e.g., to align with TI conventions). I'm working with our component quality team on this now, and I will need to get back to you next week. Sorry it is taking some time.

    Max
  • 0 in reply to Miguel Robertson
    Prodigy 10 points
    I have a similar issue. Per the paperwork date code is 1619, part marking is 55AYK8UEO. It seems the old National Semi format was "UZYYWWTT" were WW is the calendar year and YY is the calendar week, and the new TI marking format is "YMLLLLS" were Y is year and W is week. Per my notes the change on marking was on 2012. 55AYK8UEO is 9 digits long but UZYYWWTT is 8 digits long and YMLLLLS is just 7 digits long. So confusing.
  • 0 in reply to Jose Santiago2
    TI__Guru 62920 points
    Hi Jose, James,

    Sorry it's taken me a while to confirm this, but Jose you are correct. The topside marking change occurred in 2012 after TI's acquisition of National Semiconductor. The older top-side marking decoder document originally published by National is no longer accurate.

    James, the parts you mentioned were in fact assembled in May 2016 and May 2015 as I had suggested.

    Please let me know if there is anything else I can do to help.

    Regards,
    Max