Obsolete part — sourcing the last real stock
The 1.5KE9.1C-E3/73: Vishay has marked the 1.5KE9.1C-/73 as Obsolete. This means the manufacturer no longer produces it and there is no last-time-buy window open. Any available units are from surplus or distributor inventory that was pulled before the EOL date.
Package and mounting — DO-201AA axial lead
The DO-201AA (DO-27) axial-lead package is a through-hole format. The leads are inserted into plated through-holes on the PCB and soldered — the copper pad area and trace width to the pads must be sized for the 109 A peak pulse current to keep the voltage drop and inductive loop low. The 1.5KE series uses the same package footprint across the voltage range. For rework, a standard soldering iron with a chisel tip or a selective solder nozzle handles the axial leads; no hot-air profile is needed.