Typically, one only notices the failure of a TVS when it either has a short circuit due to overload. If, which rarely happens, it no longer has a TVS function, the protective function would no longer be given, but this can only be sensibly checked after removing the TVS and measuring it with a current-limited power supply unit.
No, there is no P2P replacement from STMicroelectronics available. The only similar device is the ITA25B1R, which can only protect four TVS data lines. It does not make much sense to build three such components into the layout, as the necessary wires would impair the protective function too much (do you need them for production or repair?).
But if you don't need too many replacement types, you might still find leftover quantities at the various handlers on the internet, e.g. the one mentioned by Tesla?
Good luck!
Regards
/Peter
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