What the 1500 W rating means for your protection design
The 1.5KE47C-E3/73: At the clamping voltage of 67.8 V, the device handles a peak pulse current of 22.1 A before the junction exceeds its thermal limit. The 38.1 V reverse standoff voltage means the diode draws negligible leakage below that rail level; it starts conducting in avalanche at a minimum of 42.3 V. For a 36 V nominal bus with transients up to 60 V, this part clamps the spike before downstream regulators see damaging overvoltage.
Obsolete — sourcing path for existing BOM lines
Vishay has marked the 1.5KE47C-/73 as obsolete, meaning the manufacturer no longer produces it. The TransZorb series has a wide parametric family; a pin-compatible replacement with the same DO-201AA footprint and 1500 W rating would need matching standoff and breakdown voltages. Cross-referencing is best done against the BOM's actual rail voltage and clamping requirement.
Package and thermal integration
Housed in the DO-201AA (DO-27) axial leaded package, it mounts through-hole — the leads are soldered into plated holes on the PCB. The junction temperature range spans -55°C to 175°C, so it suits both outdoor telecom cabinets and industrial enclosures where ambient heat is a factor. The 1.5KE package code is shared across the series, so the lead form and body dimensions follow the standard DO-201 outline.