Its 27 V minimum breakdown voltage and 41.4 V maximum clamping voltage define the protection window: the rail rides at 24 V, the diode starts conducting at 27 V, and the load sees no more than 41.4 V during a surge. Rated for 500 W peak pulse power under the 10/1000 µs waveform and 69 A under the 8/20 µs waveform, this part handles the energy from a typical IEC 61000-4-5 surge on a 24 V industrial or telecom line.
The 175°C junction temperature rating allows the 1N6465 to operate in high-temperature environments without derating surge capability.
Microchip lists the 1N6465 as Active.