The 1.5SMCJ20A-AU_R1_000A1: This is a unidirectional Zener-based TVS diode — the 1.5 kW peak pulse power rating at 10/1000 µs is the primary selection figure.
Clamping performance and standoff voltage
The 20 V reverse standoff sets the normal operating rail ceiling — the TVS stays high-impedance above this until the transient pushes it into breakdown. Minimum breakdown is 22.2 V, so the clamping window between 22.2 V and 32.4 V gives the protected load headroom above the 20 V rail.
AEC-Q101 qualification and automotive temperature grade
The series is marked Automotive, AEC-Q101 — this qualification covers discrete semiconductors for automotive environments, including temperature cycling, humidity bias, and mechanical stress per the AEC-Q101 stress test standard. Junction temperature rating is -55°C to 150°C, which covers the under-hood ambient band plus self-heating margin. No power-line protection flag — this part protects signal or low-power rails, not the main supply bus.
SMC package and surface-mount assembly
Surface-mount termination suits reflow assembly. The single unidirectional channel means one polarity is protected; bidirectional protection requires a second device or a bidirectional TVS variant.
Active status and sourcing posture
The part carries Active lifecycle status under Panjit International Inc., a specialist in TVS and Zener diodes for automotive and industrial applications.