Last-time-buy — what it means for your BOM
The 1.5KE11CA-E3/51: Vishay lists the 1.5KE11CA-/51 as Last Buy — the manufacturer has announced end-of-life and is accepting final orders. No official successor order code is published for this part; the last-time-buy window is the opportunity to secure lifetime-buy inventory for sustaining production. For existing designs, this is the moment to evaluate a lifetime buy or identify a functional replacement. The TransZorb series is widely second-sourced — a parametric search for a 1500 W bidirectional TVS in a DO-201 package with a 9.4 V standoff voltage will turn up alternatives from other brands, but pin-compatible direct cross-references are not recorded here.
1500 W peak pulse — the protection envelope
The clamping voltage at that surge level is 15.6 V max, triggered when the reverse standoff voltage of 9.4 V is exceeded. The breakdown voltage range (10.5 V min) defines the threshold where the device starts conducting avalanche current. For a 9.4 V nominal rail (e.g., a 9 V supply with margin), this TVS stays transparent under normal operation and only clamps during a transient. Peak pulse current capability is 96.2 A under the same 10/1000 µs pulse — that figure tells you the surge current the diode can sink before exceeding its thermal limit.
Package and mounting — through-hole axial DO-201
Housed in a DO-201AA (DO-27) axial-lead package, this is a through-hole device intended for wave-solder or hand-solder assembly. The axial form factor is common in point-to-point wiring, terminal blocks, and legacy PCB layouts where a surface-mount TVS would not fit the copper trace width needed to handle the surge current. The 1.5KE series shares the same footprint as other DO-201 TVS diodes — if your BOM already uses a 1.5KE part, this one drops in electrically and mechanically, provided the standoff and breakdown voltages match.
Sourcing posture for the last-time-buy
Available through independent distribution against an RFQ — no stock-holding claim, no price figure. For a last-time-buy part, the order quantity and delivery schedule should be locked in as soon as possible to secure allocation before the manufacturer's final ship date.