Transient protection for 15V rails
The 1N6277ARL4 is a unidirectional Zener TVS diode from the onsemi Mosorb™ series, rated for 1500W peak pulse power at 10/1000 µs waveform. It clamps transients at 25.2V maximum when the surge current reaches Ipp, protecting downstream circuitry on a 15.3V nominal rail. The DO-201AD axial package supports through-hole mounting, suited for high-reliability power supplies, industrial controls, and telecom line cards where surge immunity is specified. Operating junction temperature spans -65°C to 175°C, covering military and automotive under-hood thermal extremes without derating concerns.
Clamping voltage and breakdown margin
Minimum breakdown voltage is 17.1V, providing a 1.8V guard band above the 15.3V standoff. The 25.2V clamp at peak pulse current ensures the protected bus sees no more than 25.2V during a surge event. No power line protection feature is integrated — this device is a standalone TVS, not a combination protector.
Obsolete status and sourcing path
onsemi has marked the 1N6277ARL4 as Obsolete. No official successor is listed in the available records. Buyers should confirm BOM fit and source remaining inventory through authorized channels or verified stock. For new designs, evaluate current onsemi TVS families with equivalent 1500W rating and DO-201AD footprint.