The 1.5SMC7.5AHM3/H is a unidirectional Zener-type TVS diode in the 1.5SMC family, AEC-Q101 qualified for automotive environments — meaning it has passed the temperature cycling, humidity bias, and surge stress screens that distinguish automotive-grade parts from commercial equivalents. Rated 1500 W peak pulse (10/1000 µs waveform), the 11.3 V clamping voltage ceiling is the let-through voltage the protected circuit sees when a surge fires — this is the clamping ceiling, not the clamping action voltage, so the downstream MOSFET gate or bus input must be rated above 11.3 V. The reverse standoff of 6.4 V sets the working DC voltage the diode blocks continuously; the minimum breakdown of 7.13 V means it does not clamp below that threshold in normal operation.
Peak pulse current, temperature, and package — the ratings that drive BOM fit
Junction operating temperature of -65 °C to +150 °C covers the automotive under-hood band — an ECU mounted near the engine bay in a summer idling condition typically sees 125 °C local ambient; the 150 °C TJ rating provides margin before thermal derating activates. DO-214AB (SMC) surface-mount package with Tape & Reel packaging — the cathode band marks the unidirectional polarity direction; the device is not a power-line protector (power line protection is listed No), so it is correctly deployed as a secondary clamp on a signal or low-current rail, not across the main power bus.