The STMicroelectronics 1.5KE82ARL is a unidirectional Zener transient voltage suppressor from the 1.5KE TRANSIL™ series, rated for 1500W peak pulse power over a 10/1000µs waveform. It clamps transients at a maximum of 146V with a minimum breakdown voltage of 77.9V and a reverse standoff of 70.1V, meaning it stays out of circuit under normal 70V DC rails and only conducts when a surge exceeds that threshold. The DO-201AA axial-lead through-hole package suits point-to-point wiring on terminal strips, power-entry boards, or telecom line cards where a soldered-in transient clamp is preferred over surface-mount.
Lifecycle reality — obsolete, sourced through independent channels
STMicroelectronics lists the 1.5KE82ARL as obsolete.
The 1500W peak pulse rating (10/1000µs) is the headline number — it determines how much transient energy the part can absorb before failing. The 69A peak pulse current at the 8/20µs waveform is the more aggressive surge spec used in IEC 61000-4-5 testing; a design targeting that standard should verify margin against the clamp voltage of 146V at that current. The 1350pF capacitance at 1MHz matters when the suppressor sits on a data line — it loads the signal and can round edges on high-speed interfaces.