This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

OPA4137: How to define date code from actual marking on PN: OPA4137U

Part Number: OPA4137

PN: OPA4137UA

We recently purchased this part from TI store but I would like to find out how to determine date code from marking on the actual part.

There was no date code indicated from packing slip or instruction from the data sheet how to interpret what marking is.

On the front of actual part, part marked as below

2CAF3CK

OPA4137U

On the back of actual part, part marked as below 

N22

F15

Marking on the front of actual part were same for all 20 pieces

On the other hand marking on the back on this part were different.

I am assuming marking on the back might be something related to date code information which i am not sure about.

Please advise which side of marking defines date code and how to interpret it, 

  • Hi Daniel,

    In your case, the date code is the 2CAF3CK. This device and package follows the industry standard YMLLLLS standard where Y is the last digit of the year produced (2012) and M is the month (1=January, 2=Feb, ....9=Sept, A=Oct,B=Nov,C=Dec).

    More topside marking info can be found here: www.ti.com/.../topsidemarkingformats.tsp

    Hope that helps,
    Paul
  • Thank you for your prompt response.
    But i am having trouble defining date code from the marking.

    As you have mentioned from the above, marking that defines date code would be "2CAF3CK"

    I understand "2" is Y the last digit of the year produced (2012).
    But i am not able to interpret remaining marking "CAF3CK"
    C = Dec
    A = Oct
    F = ?
    3 = ?
    C = Dec
    K = ?

    Please advise
  • The standard format here is YMLLLLS where Y=Year, M=month, LLLL=lot code, and S=production site.

    Only the first two numbers/letters determine the date.

    -Paul