i need help GP 828 case SMB what is this ????

[pieniek1971]

zener  transil  parametr Is there a catalog of ST smd elements to download somewhere?

 

[Tesla DeLorean]

That's not the part number, sounds like the production plant/date code.

Provide all the marking info, or provide a clear, large, and in-focus picture of the device.

The marking codes are in various data sheets, for the diodes typically a two or three letter code.

This is not exhaustive, but a start..   https://github.com/cturvey/RandomNinjaChef/blob/main/stdiode.txt