Conterfeit Devices

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How can I identify a genuine PI component?

We have issues with switcher failure in a PCB using the TNY264GN and the part appears physically different to a known good device on a similar PCB.

All the TinySwitch parts that I have, appear to have printed markings, but those on the faulty device look laser etched.

첨부 파일Size
Removed from faulty PCB110.31 KB