1.5kW TransZorb® — the clamping number that matters
The 1.5KE220-E3/54: The 1.5KE220-/54 is a 1500 W peak-pulse TVS diode from Vishay's TransZorb® series, built to clamp transients on a 175 V DC rail.
Obsolete — sourcing through surplus channels
Vishay lists this part as Obsolete. If your BOM still calls for the 1.5KE220-/54, the DO-201AA axial footprint is common across the 1.5KE family, so a pin-compatible functional equivalent from the same series may substitute with a parametric check.
DO-201AA axial — board-fit and thermal note
Through-hole DO-201AA (DO-27) axial package — the leads are tin-plated copper and the body is molded epoxy. The junction operates from -55°C to 175°C, so the part handles the self-heating from a 1500 W pulse without derating at room ambient. For repetitive surges, the lead length and PCB copper area under the body set the thermal impedance; keep the leads as short as the assembly process allows to minimize inductance between the TVS and the protected rail.