1500 W peak pulse, AEC-Q101 qualified
The 1.5SMC22AHE3_A/H: It clamps at 30.6 V maximum with a 49 A peak pulse current, protecting downstream electronics from transients up to that energy level. The 18.8 V reverse standoff voltage defines the DC operating rail it protects — a 12 V or 15 V bus with margin.
Automotive-grade clamping for 12 V / 15 V rails
AEC-Q101 qualification means this part passed the automotive stress tests: high-temperature reverse bias, temperature cycling, and ESD robustness per the JEDEC standard for discrete semiconductors. Breakdown occurs at 20.9 V minimum, so the device stays off below that threshold and only conducts during a transient event — no leakage on the nominal rail. The DO-214AB (SMC) surface-mount package handles the 1500 W pulse without exceeding the junction limit when the PCB copper area follows the recommended footprint.