Clamping performance for a 12.8 V rail
The 1.5SMC15A/TR7: The 1500 W rating is the peak pulse power the device can absorb in a single surge event at 25 °C; derate for elevated ambient temperature per the datasheet curve.
Housed in the DO-214AB (SMC) package, this is a surface-mount Zener TVS diode with a single unidirectional channel. The SMC footprint is larger than the SMA/SMB siblings, which helps with thermal dissipation during the pulse — the junction-to-ambient thermal resistance is lower because the pad area can be bigger. Store the reels in a dry environment — the DO-214AB body is not moisture-sensitive per JEDEC levels, but the paper carrier tape can absorb humidity over long storage.