The 1.5KE33A_R2_00001 is a 1500 W transient voltage suppressor from Panjit's 1.5KE series, designed to clamp fast overvoltage spikes on a 28.2 V nominal rail. The Zener-type construction means it breaks down at a minimum of 31.4 V and clamps the pulse to 45.7 V at the rated 33 A peak pulse current (10/1000 µs waveform). That 1500 W rating is the peak pulse power dissipation for an 8/20 µs or 10/1000 µs double-exponential waveform — the actual energy handling depends on the pulse duration and duty cycle. For a 10/1000 µs pulse, the device absorbs 1500 W for 1 ms; shorter pulses allow higher peak current before the junction temperature limit is reached.
28.2 V standoff — where this TVS sits in the circuit
Clamping at 45.7 V means the protected circuit must tolerate that voltage for the duration of the surge. If the downstream silicon (DC-DC converter input, linear regulator) has an absolute maximum below 45.7 V, a secondary clamp or a lower-voltage TVS in series may be needed. The unidirectional channel (single diode) clamps only positive transients above breakdown. For AC lines or bidirectional protection, two devices back-to-back or a bidirectional TVS are required — the 1.5KE series includes bidirectional variants under different order codes.
DO-201AE axial package — board integration
The DO-201AE (also known as R-6) axial-lead package is a through-hole form factor rated for the full 1500 W pulse. The large body and thick leads handle the thermal pulse without cracking the epoxy — the junction temperature range spans -65°C to 175°C, covering military and industrial extremes. Through-hole mounting means the leads are bent and soldered into plated through-holes on the PCB. The axial lead spacing is standard for this package class; verify the hole diameter and pad size against the manufacturer's recommended footprint before layout.
Obsolete — sourcing through independent channels
Panjit lists the 1.5KE33A_R2_00001 as obsolete. For new designs, consider a current-production TVS from the same 1.5KE family with the same standoff voltage (28.2 V) and package (DO-201AE). The 1.5KE series includes many active variants; verify the exact breakdown and clamping specifications against the BOM requirement.