Active AEC-Q101 TVS for 24V rails
The 1.5SMC24CAHM3_A/I: That qualification is the line item an OEM auditor checks first; this part carries it, so it is eligible for PPAP submission on an under-hood 24V supply clamp without a waiver.
Peak pulse rating and the clamping decision
Rated for 1500 W peak pulse power (1.5 kW) with a 10/1000 µs waveform, this TVS clamps at 33.2 V max when conducting 45.2 A. The reverse standoff voltage is 20.5 V, meaning the part is fully non-conducting below that level and begins to avalanche at 22.8 V minimum breakdown. For a 24 V nominal automotive bus that sees transients up to 33 V, the 20.5 V standoff leaves enough margin that the diode does not leak during normal operation but still catches the surge before the downstream IC's abs-max rating.
Bidirectional channel and temperature envelope
A single bidirectional channel protects against positive and negative transients equally — one component for both polarities, saving board space versus two unidirectional diodes back-to-back.
Surface-mount package and board integration
The SMC body is larger than the SMA/SMB siblings, which keeps the junction-to-ambient thermal resistance low enough to sustain repetitive pulse trains without exceeding the 150°C limit. The supplier device package is identical to the case code (DO-214AB), so the PCB land pattern is unambiguous.