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DS26C31MQML: Reading date code

YOICHI SAKAGUCHI
Prodigy 50 points
Part Number: DS26C31MQML

Hello,

Could someone explain the meaning of "D" and "9A" on the 1517D 9A marked on this DS26C31MQML?

thank you
Andrew

  • 0
    TI__Guru 62930 points
    Andrew, the D represents multiple lots with same year/week of seal. So, there would be 1517A, B, C, D, ...
    The 9A represents the date code for the base wafer diffusion. ie, wafer lot.

    If this answers your question, please click "Verify it as the answer"
    Regards,
    Wade
  • 0 in reply to Wade Vonbergen
    Prodigy 50 points
    I see. thank you for your help.
    COuld you please explain how to calculate the datecode for 9A?
    Is it month (9 = september)?

    thank you
    Andrew
  • 0 in reply to YOICHI SAKAGUCHI
    TI__Expert 5570 points

    Good morning!

    For wafer fabriacation date code it is last digit of year (0-9) and quarter (A/B/C/D) so 9A is, for example, 1Q2009.  Each QML Class Q and CLass V lot is accompanied by a Processing Conformance Report which will list the decoded information.  See "Texas Instruments QML Lot Documents" at www.ti.com/lit/SBOA140

    Richard Biddle