1500W peak pulse in a DO-201AD axial body
The 1N6373 is a single-channel unidirectional Zener TVS from onsemi's Mosorb™ series, rated for 1500W peak pulse power at 10/1000 µs waveform. The 5V reverse standoff voltage and 9.4V clamp at Ipp make it a direct fit for protecting 5V DC rails in telecom, industrial, and automotive auxiliary circuits. The DO-201AD axial package (9.5 mm body length) is a through-hole form factor that survives wave solder and high-vibration environments without the solder-joint fatigue risk of an SMD package.
Breakdown and clamp voltages for 5V rail protection
Minimum breakdown voltage is 6V, with a typical standoff of 5V and maximum clamp at 9.4V. The 4.4V margin between standoff and clamp means the protected rail sees less than 10V during a transient — well within the absolute max of most 5V logic and linear regulators. No power line protection feature, so it is a straight shunt device; the TVS absorbs the surge, not a series element.
onsemi lists the 1N6373 as Obsolete. For BOM lines that still call out this exact order code, the only supply path is the open market — sourced per RFQ against the buyer's quantity. The -65°C to 175°C junction range exceeds the typical industrial temperature envelope, so any replacement must match that thermal headroom if the application runs hot.