What the 1.5SMCJ22A is — unidirectional Zener TVS in DO-214AB
The 1.5SMCJ22A-AU_R1_000A1 is a unidirectional Zener-based transient voltage suppressor in the DO-214AB (SMC) surface-mount package, qualified to AEC-Q101 for automotive environments. It sits on the 22V reverse standoff rail — the maximum working voltage the protected line can hold during normal operation — and clamps to 35.5V maximum during a surge event. At that waveform, the clamping voltage of 35.5V sees a peak pulse current of 42.2 A. The clamping voltage is the action spec for TVS selection: it must stay below the absolute-max rating of whatever downstream IC or MOSFET it is protecting.
Automotive temperature grade and AEC-Q101 qualification
Junction operating temperature runs -55°C to 150°C, which covers the full under-hood range — cold soak in winter, thermal soak in summer, and the transient spikes during engine start-stop cycles.
Sourcing status — active production, quoted to order
Production status is listed Active.