1500W Zener TVS – DO-201AD axial, 5V standoff
The 1N6373RL4 is a Zener-type transient voltage suppressor from onsemi's 1N6373 series, designed for general-purpose circuit protection. It delivers 1500W peak pulse power per the 10/1000µs waveform, clamping at 9.4V max from a 5V reverse standoff. The DO-201AD axial package suits through-hole mounting on boards where leaded parts are preferred for thermal mass or retrofit compatibility. Operating temperature spans -65°C to 175°C junction, covering most industrial and automotive under-hood environments. The single unidirectional channel protects one rail or signal line.
Clamping voltage and surge current – the protection envelope
At the 10/1000µs test waveform, the 1N6373RL4 handles 160A peak pulse current. The 9.4V clamping ceiling means the protected circuitry sees no more than that during a transient. For a 5V rail, that leaves a 4.4V margin above the nominal supply – enough to keep downstream ICs below their absolute-max ratings in most cases. Power line protection is not listed as supported, so this part is best applied on signal or low-power supply lines rather than mains or high-current bus protection.
onsemi lists the 1N6373RL4 as Obsolete. No direct successor is recorded in the available documentation. For new designs, evaluate onsemi's current TVS portfolio in the axial footprint or consider a pin-compatible Zener TVS from another manufacturer. For existing BOM lines, independent inventory is the primary sourcing channel – request a quote for current availability and pricing. Cut Tape options may also be available from distributors holding remaining stock.