15V rail clamp – breakdown and clamping specs
Its reverse standoff voltage is 15V, meaning the device does not conduct at normal operating voltage up to that level. The minimum breakdown voltage is 16.7V, so the avalanche triggers cleanly above the rail. That 24.4V ceiling is what the downstream circuitry sees.
600W peak pulse – energy handling for real transients
Rated at 600W peak pulse power, this part can absorb a substantial energy spike from inductive kickback, lightning-induced surges, or ESD events. The DO-214AA SMB package keeps the thermal mass moderate.
Microchip lists the SMBJ15AE3/TR13 as Active.