The 1.5SMCJ24AS_R1_00001 clamps transients at a maximum 38.9 V when the peak pulse current of 38.6 A flows through the device (10/1000 µs waveform) — this means the downstream circuitry sees a hard ceiling of 38.9 V during a surge event, well below the breakdown threshold of 26.7 V minimum that initiates clamping. The 24 V reverse standoff is the dc working voltage the line normally operates at without the device conducting.
Junction thermal margin and general-purpose use
Rated to 150 °C junction temperature, with a wide -55 °C cold start — this temperature band covers outdoor and industrial enclosure environments where the TVS sees extended dissipation during repeated clamping events. The peak pulse rating of 1.5 kW is sized for IEC 61000-4-5 surge immunity testing at the 24 V line level; confirm the clamping energy at your specific surge current before committing to the BOM line.