What the 1500W rating means on a repair bench
The 1.5SMC22CA-M3/9AT: That 1.5 kW rating tells you the die absorbs a 49 A surge without shorting — the scorch mark on the board tells you whether the clamping voltage held or the part gave up. When it fires, the clamping voltage peaks at 30.6 V — that is the voltage the downstream silicon actually sees during the event.
Package and board-fit for the DO-214AB footprint
The supplier device package is listed as DO-214AB (SMCJ) — a standard JEDEC outline that reflow solders with a typical 260 °C peak profile. The junction temperature rating means the part survives repeated clamping events at high ambient without derating the peak power — useful for outdoor or engine-bay environments.