What the 1500W rating means for your protection design
The 1.5SMC10AHM6G: For a 24V automotive battery line, the 8.55V reverse standoff voltage means it stays transparent during normal operation, then breaks down at a minimum of 9.5V to shunt the surge to ground. The clamping voltage is held to 14.5V maximum at the peak current of 108A, which keeps downstream 12V-rated ICs within their absolute maximum ratings during a load-dump transient.
Automotive qualification and temperature envelope
The DO-214AB (SMC) package is a standard surface-mount footprint for 1500W TVS diodes — the large copper pad on the cathode side carries the surge current into the PCB plane.