Clamping voltage and breakdown margin
The 1.5SMC22CAHM3/I: Breakdown occurs between 20.9 V minimum and the clamping ceiling of 30.6 V at full Ipp — that 9.7 V window means the protected rail sees no more than 30.6 V during a 1500 W surge. For a 24 V automotive bus that dips to 18 V during cranking, the 18.8 V standoff holds off the bus without leakage, and the 20.9 V breakdown triggers before the downstream regulator's abs-max.
Sourced to order against BOM quantities; availability and current pricing confirmed at RFQ. The DO-214AB footprint is shared across the 1.5SMC family, so a BOM position for this bidirectional 22 V part can be cross-referenced against other 1.5SMC variants at quote time.