1500 W bidirectional transient suppressor — Last Buy window
The 1.5KE9.1CA-E3/51: The device is marked as Last Buy by Vishay, meaning the manufacturer has initiated end-of-life — orders are placed against available inventory through independent distribution channels.
The 13.4 V maximum clamping voltage is the peak voltage the downstream circuitry sees during a 112 A surge event — any component rated below this clamp voltage risks avalanche failure. With a 7.78 V standoff, the TVS draws negligible leakage at normal 5 V or 9 V rails, but a 12 V rail sits above the standoff and would keep the diode in continuous breakdown — this part is not suited for 12 V supply protection.
DO-201AA axial package — board integration and thermal path
Housed in a DO-201AA (DO-27) axial-lead through-hole package, the 1.5KE series body transfers heat through the lead wires into the PCB copper — adequate pad area on both sides of the board reduces thermal resistance during repetitive surge events. The operating junction temperature range spans -55°C to 175°C, covering industrial enclosures and automotive under-hood environments where ambient heat adds to self-heating during clamping.
Sourcing reality for a Last-Buy part
No official pin-compatible successor is listed on the manufacturer record. For a BOM line already qualified to this axial TVS, securing the remaining lifecycle inventory now avoids a last-minute board respin to a surface-mount alternative.