For a 12V automotive system, the 8.5V reverse standoff voltage means the diode stays out of the way during normal operation, while the 9.5V minimum breakdown voltage ensures it triggers before the downstream circuitry sees damaging voltage. The maximum clamping voltage of 14.4V at Ipp tells you the worst-case voltage the protected load will see during a surge — important for selecting downstream capacitors and ICs with sufficient voltage margin.
It is surface-mount, so reflow soldering is the typical assembly method. The package is rated for the full 3000W peak pulse, but the PCB copper area and thermal vias under the device directly affect how much average power it can dissipate — a solid ground-plane connection under the SMC pad is recommended for repetitive surge events.
This is a standard catalog part from STMicroelectronics, available through independent distribution.