Protection window: standoff, breakdown, and clamping
The 1.5SMC9.1A_R1_00001 clamps at 13.4 V maximum under a 112 A peak pulse (10/1000 µs waveform), while the reverse standoff sits at 7.78 V typical — the protection band runs from the 8.65 V minimum breakdown up to that 13.4 V ceiling, so the downstream circuit sees a clamped event rather than the raw transient. 1.5 kW peak pulse dissipation in this package is the 10/1000 µs figure — that waveform matters because the diode's thermal time constant is longer than the spike; a faster 8/20 µs surge handles proportionally less energy at the same peak current.
Thermal margin and temperature grade
Junction temperature is rated to 150 °C, with the lower bound at -55 °C — that gives a 200 °C swing, which covers most industrial enclosures and automotive under-hood profiles without derating the clamping voltage below the 13.4 V ceiling. The SMC package thermal resistance is governed by the pad geometry on the board; Panjit specifies the package but not a θJC on the face sheet, so the board-level thermal design follows the standard DO-214AB land pattern recommendations.
Package and sourcing posture
DO-214AB (SMC) is a standard 2-pin surface-mount footprint — compatible with the common 1.5SMC landing pattern, so second-source equivalents in the same package are generally pin-compatible if the clamping specs match the application window.