1500 W peak pulse in a DO-201AA axial package
The 1.5KE540A-E3/73: With a 459 V reverse standoff voltage and a clamping ceiling of 740 V at 2.03 A peak pulse current, this part protects high-voltage DC rails and AC line-side circuits in industrial power supplies and telecom rectifiers. The 513 V minimum breakdown voltage gives a guard band above the 459 V working voltage, so the diode stays transparent under normal line conditions and only conducts when a transient pushes the rail past the avalanche threshold.
Through-hole axial package for high-reliability insertion
Housed in a DO-201AA (DO-27) axial-lead package, the 1.5KE540A-/73 mounts through-hole on a PCB or terminal block. The axial body and 0.042-inch diameter leads handle the thermal cycling of repeated surge events — the lead-to-body joint is the mechanical weak point in a wave-solder process, so a pre-bend radius of at least one lead diameter keeps the glass seal intact. The Tape & Box (TB) packaging option suits hand-insertion or semi-automated assembly lines where the axial leads need to be formed and cut to length before insertion. No power line protection feature is claimed, so this is a pure transient suppressor — not a crowbar or a filter.
Active lifecycle and sourcing posture
The 1.5KE540A-/73 carries an Active product status from Vishay, meaning the die and assembly lines are still running.