1500 W peak pulse — what it means on a 30.8 V rail
The 1.5KE36A-E3/54: The 30.8 V reverse standoff voltage means it sits across a 30.8 V DC rail without conducting in normal operation; breakdown starts at 34.2 V minimum, giving a 3.4 V guard band before the avalanche region. The single unidirectional channel protects one polarity — reverse the part or use two back-to-back for bipolar rails. No power-line protection rating means it is intended for signal or low-energy DC bus clamping, not AC mains.
Through-hole DO-201AA — rework-friendly package
Axial-lead DO-201AA (DO-27) package, through-hole mount. The leads are thick enough to hand-solder or wave-solder without thermal damage to the die. Orientation is unambiguous — the cathode band marks the polarity, and the body is large enough to read under a bench magnifier.