What the 1500 W rating means for your rail
The 1.5KE39A B0G is a 1500 W peak pulse power Zener TVS diode from Taiwan Semiconductor's 1.5KE series. It clamps transients on a 33.3 V nominal rail — the reverse standoff voltage — and starts conducting at 37.1 V minimum breakdown. At the full 29 A peak pulse current (10/1000 µs waveform,), the clamping voltage reaches 53.9 V maximum. That 53.9 V ceiling is what the downstream silicon sees; if your 33 V bus has a 60 V abs-max FET on it, this TVS holds the gate voltage inside the safe operating area.
Through-hole axial package — board-fit note
Housed in a DO-201AA (DO-27) axial-lead package, the 1.5KE39A B0G is a through-hole part intended for point-to-point wiring or PCB mounting with 0.040-inch diameter leads. The DO-201 footprint is standard across the 1.5KE series, so a single board layout accepts the whole voltage range. The bulk packaging suits hand-insertion or low-volume assembly; no tape-and-reel option is listed on this order code.
Sourcing and procurement
Taiwan Semiconductor Corporation lists the 1.5KE39A B0G as an active product.