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Component identification ST GP121
Greetings. Please help me identify this component. Thank you

Another variation?

Greetings. Please help me identify this component. Thank you

Another variation?

First one is SMAJ28CA-TR TVS diode. The marking is CH. The GP121 is the location and date code.

https://www.st.com/resource/en/datasheet/smaj12a.pdf
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