DO-214AB package and board-fit
The 1.5SMC18AH: The 15.3V standoff means a 12V or 15V rail sees no leakage under normal operation; the 25.5V clamp protects downstream devices rated for 30V or higher.
AEC-Q101 grade and temperature envelope
AEC-Q101 qualified — this is the automotive discrete semiconductor stress test standard. The -55°C to 150°C junction temperature range covers underhood and engine-bay thermal profiles with margin; the 150°C TJ max is the absolute limit, not a continuous operating recommendation.
Sourcing and compliance posture
The 1.5SMC18AH is listed for Telecom applications but the AEC-Q101 grade extends its fit to automotive ECUs, battery management, and ADAS power rails. No power line protection (the TVS clamps transients, not continuous overvoltage). Standard compliance documentation (RoHS, REACH) is provided by the manufacturer.