Welcome @vitalii_88, to the community!
The marking information is indeed internal, but the date code at STMicroelectronics is typically encoded as YWW, which for the ST1L05 can be found in characters 2...4 in the first line:
- Y is the last digit of the year of manufacture
- WW is the calendar week
The ST1L05 came into being in 2008, making a corresponding digit for Y possible.
Hope that helps?
Regards
/Peter
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