1500W surge rating and what it means for your protection threshold
The 1.5KE43A-T is a 1500W (1.5kW) peak pulse power Zener TVS diode from Diodes Incorporated, designed to clamp transient overvoltage events on a 36.8V nominal rail. The clamping voltage is held to 59.3V at the rated 25.3A peak pulse current (10/1000µs waveform), which means a 48V bus or a 36V supply line sees the transient clipped before it reaches downstream silicon.
DO-201 axial package and board integration
Housed in a DO-201AA / DO-27 axial leaded package (supplier device package DO-201), the 1.5KE43A-T is a through-hole component intended for manual or wave-solder assembly. The axial leads suit point-to-point wiring or PCB mounting with 0.040-inch diameter holes on a 0.300-inch lead spacing. The junction temperature range spans -55°C to 175°C, covering military-temperature applications and high-ambient environments like power supplies or motor drives where the diode sees self-heating during repetitive surge events.
Unidirectional Zener TVS — one channel, general-purpose transient suppression
This is a single-channel unidirectional Zener TVS, meaning it clamps positive transients referenced to ground and conducts in avalanche mode above the breakdown voltage. The general-purpose application tag covers use in secondary surge protection on I/O lines, relay coils, DC motor drivers, and telecom equipment where the 1500W peak pulse rating absorbs occasional transients without sacrificing the 36.8V standoff margin.