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vitalii_88
Visitor II
May 14, 2026
Solved

ST1L05CPU33R chip marking ?

  • May 14, 2026
  • 1 reply
  • 132 views
 
good morning!
Where can I get information about the datacode of such a chip ST1L05CPU33R?
There is no information about the marking in the technical documentation.
Best answer by Peter BENSCH

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

1 reply

Peter BENSCH
Peter BENSCHBest answer
ST Technical Moderator
May 15, 2026

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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