Standoff, clamping, and peak pulse ratings
The 1.5SMCJ75A-AQ: The reverse standoff of 75 V defines the working rail this diode protects — in a 12 V automotive system the TVS sits idle below standoff and activates only when a load-dump or transients event drives the line above 75 V. That combination — 75 V standoff with a 1500 W peak pulse rating — is the standard transient-suppression class for automotive ECU input protection, where ISO 7637-2 load-dump pulses require a clamping device that survives the event energy without letting the downstream IC see more than its absolute-maximum rating.
Automotive temperature grade and junction limits
The DO-214AB (SMC) package is the standard automotive TVS footprint; it mounts directly to the PCB surface and conducts heat through the cathode tab to the board copper — the landing pad geometry sets the effective thermal resistance, not the package itself.
Automotive qualification and compliance
Listed under Automotive applications, which in Diotec's nomenclature designates AEC-Q101-qualification intent — the stress-testing sequence that covers temperature cycling, humidity, and surge exposure consistent with the automotive Electronics Council discrete-semiconductor qualification floor. The part is packaged in strip format for automated SMT assembly, and power-line protection is listed as no — this diode protects individual signal or power nodes at the board level, not a shared bus rail.