600 W bidirectional TVS for 7.5 V rail protection
The SMBJ7.5CA-13: The 7.5 V reverse standoff voltage (working voltage) means the device does not conduct at the normal rail voltage; it starts to break down at 8.33 V minimum, protecting downstream components from overvoltage events up to the clamping limit.
DO-214AA SMB footprint and temperature range
The single bidirectional channel protects one signal or power line; no power line protection feature is claimed, so it is intended for data lines, low-voltage DC buses, or I/O ports rather than AC mains.