1500W peak pulse in a DO-214AB — the surge rating that defines the fit
The 1.5SMC170AHM3/I: That 1500W rating means it can clamp a 6.4A peak pulse current at 234V without exceeding the junction temperature limit — the energy is absorbed in the silicon die, not dissipated in an external snubber. The reverse standoff voltage is 145V, with a minimum breakdown of 162V. For a 145V nominal DC rail — common in automotive 24V systems after a boost stage or in telecom rectifier outputs — this part sits below the rail voltage during normal operation and only conducts when a transient pushes the line above 162V.
Package and board-fit — DO-214AB footprint, reflow profile
The DO-214AB (SMC) package is a surface-mount form factor with a cathode band for polarity identification. The supplier device package is the same DO-214AB (SMC) — no sub-variant. The mounting type is surface mount, compatible with standard reflow soldering profiles. The package footprint is shared across the 1.5SMC series, so a single PCB land pattern serves the full voltage range from 5V to 188V. Power line protection is marked as No — this is a TVS for DC rail clamping, not for AC mains. The unidirectional configuration means it protects one polarity; for bipolar rails, two parts or a bidirectional variant would be needed.