W39L040 Datasheet, PDF (24/27 Pages) Winbond – 512 K X 8 CMOS FLASH MEMORY

11. HOW TO READ THE TOP MARKING
Example: The top marking of 32-pin TSOP W39L040T-70
W39L040
W39L040T-70
2138977A-A12
149OBSA
1^st line: Winbond logo
2^nd line: the part number: W39L040T-70
3^rd line: the lot number
4^th line: the tracking code: 149 O B SA
149: Packages made in '01, week 49
O: Assembly house ID: A means ASE, O means OSE, ... etc.
B: IC revision; A means version A, B means version B, ... etc.
SA: Process code
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