SNOAA35D April 2023 – December 2023 LM2901 , LM2901B , LM2901B-Q1 , LM2903 , LM2903-Q1 , LM2903B , LM2903B-Q1 , LM339 , LM339-N , LM393 , LM393-N , LM393B , LM397 , TL331 , TL331-Q1 , TL331B
The Single TL331 and Dual LMx39/2903 use a different fab location than the quad LMx39/2901. This requires looking at the 21L label fields.
For the single and dual, if the Chip Country of Origin (21L) CCO: field says USA, then this is the classic die.
For the single and dual, if the Chip Country of Origin (21L) CCO: field says CHN, then this is the new die.
Please ignore the (2P) REV: x field (crossed out above) to determine which die is used. This field is the revision of the particular die used and does not represent which core die design is used. This has caused some confusion in the past.