7V rail clamp in a DO-214AC footprint
Its reverse standoff voltage is 7 V, with a minimum breakdown of 7.78 V and a maximum clamping voltage of 13.3 V at the peak pulse current of 37.8 A. This is a general-purpose protection part suited for DC power buses, signal lines, and I/O ports where a unidirectional clamp is needed.
Clamp voltage and breakdown margin
The gap between the 7 V standoff and the 7.78 V minimum breakdown gives a guard band of 0.78 V — enough to avoid false triggering on normal rail ripple. The 13.3 V clamp is the ceiling the protected circuitry sees during a surge; for a 7 V rail, this leaves a ~6 V margin above the operating voltage, which is typical for a 500 W device in this voltage class. No power line protection, so it's intended for secondary-side or low-voltage DC rails rather than mains AC.
Microchip lists the SMAJ7.0E3/TR13 as Active. Sourced per RFQ; current lead time and price confirmed at quote time against your BOM quantity.