What the standoff and clamping ratings mean for the protected circuit
The 1.5SMCJ18CA-AU_R1_000A1: The 18V reverse standoff (typ) is the working voltage — above it the TVS begins to avalanche and conduct the surge to ground. The 20V minimum breakdown is where avalanche starts; the 29.2V clamping ceiling at the peak pulse current is what the downstream load actually sees during a transient event. The DO-214AB (SMC) package is the standard SMC outline — fits any 214AB land pattern. The cathode band marks the anode side on the unidirectional pinout; the bidirectional variant clamps symmetrically on both polarities.
AEC-Q101 qualification and the automotive thermal envelope
AEC-Q101 means this part passed the automotive discrete semiconductor qualification sequence — temperature cycling, humidity bias, high-temperature reverse bias, and surge lifetime testing at the component level. For an ECU input or power-rail protection slot, this is the qualifying gate. Derate peak pulse power above 25°C per the standard TVS derating curve.
Sourcing — active production status
Listed as Active with no stated obsolescence notice. Available through independent distribution channels against an RFQ — confirm quantity, date code, and full lot traceability at quote time.