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Bottom side part marking question - Can you tell me what these markings mean?

Hello, I'm new here so if I'm posting this in the wrong forum, please tell me where to go!  :-)

I'm using AM26LV31IDR and have noticed the parts have different numbers on the bottom side.

Can anyone tell me what these numbers mean?

  • That appears to be the Lot Trace Code information:
    (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device
  • NJ,

    It identifies the Mold die, mold chase and cavity number used on the Mold Press machine.

    Cavity Codification
    Sample: 07D06
    07= # ID Mold Die
    D = Mold Chase
    06 = Cavity position

    In other words the numbers aren't useful unless mold press wasn't right. Then we would know where to look.