What the 1500W rating means on a 9V rail
The SMCJ9.0A-13: That power rating is the energy the die can absorb in a single surge event — on a 9V DC rail, the clamping voltage of 15.4V (max) means a downstream IC rated for 16V or higher survives a nearby lightning strike or inductive kickback without secondary protection.
Package and board-fit: DO-214AB (SMC)
Housed in the DO-214AB (SMC) surface-mount package with a supplier device package designation of SMC. The footprint is standard for this power class — the same pad layout used by other 1500W TVS diodes, so a board already laid out for a competitor's SMC package accepts this part without a spin.
This covers the full industrial temperature band plus margin — a 24/7 outdoor telecom power supply or an engine-bay ECU sees ambient well below 85°C, and the 150°C ceiling gives headroom for self-heating during repetitive surge events.