The 1N6291AHE3_A/D is a unidirectional Zener-based TVS (TransZorb®) rated 1500 W peak pulse at a 10/1000 µs waveforms — the 58.1 V reverse standoff sits well below the 64.6 V minimum breakdown, so the device idles harmlessly below the clamping threshold and turns on hard when a transient exceeds the breakdown knee. At 16.3 A peak pulse current the clamping ceiling holds at 92 V maximum, which means it absorbs a 1.5 kW transient without letting the downstream circuit see more than 92 V — the gap between standoff and clamping is deliberate design margin, not a spec artifact.
DO-201AA axial — through-hole mount with thermal leads
The DO-201AA (DO-27) package mounts in a standard 5.08 mm lead spacing through-hole footprint — the axial leads conduct heat away from the junction into the PCB copper, which is why the junction temperature rating runs to 175 °C. Tape & Box packaging is the standard reel substitute for high-volume axial production runs — the device ships with leads cropped to the supplier device package designation of 1.5KE.
AEC-Q101 qualified for automotive under-hood deployment
The series designation Automotive, AEC-Q101, TransZorb® means the part passed the automotive electronics council stress test sequence for discrete semiconductors — temperature cycling, humidity bias,ESD, and mechanical shock per AEC-Q101. The -55 °C to 175 °C junction operating range covers the under-hood hot soak band without derating.