W39V040C Datasheet, PDF (34/36 Pages) Winbond – 512K × 8 CMOS FLASH MEMORY WITH LPC INTERFACE

15. HOW TO READ THE TOP MARKING
Example: The top marking of 32-pin STSOP W39V040CQZ
W39V040C
W39V040CQZ
2138977A-A12
345OBFA
1^st line: Winbond logo
2^nd line: the part number: W39V040CQZ (Z: Lead free part)
3^rd line: the lot number
4^th line: the tracking code: 345 O B FA
149: Packages made in ’03, week 45
O: Assembly house ID: A means ASE, O means OSE, ...etc.
B: ic revision; A means version A, B means version B, ...etc.
FA: Process code
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