Last-buy status and what it means for your BOM line
The 1.5KE110CA-E3/51: Vishay has placed the 1.5KE110CA-/51 on Last Buy status — the manufacturer is no longer accepting new orders beyond the final production window, and once that inventory is exhausted the part will be discontinued. For a BOM that already carries this TVS, the immediate decision is whether to secure lifetime-buy quantities now or plan a qualification run on a replacement.
1500W peak pulse — the protection envelope
The 94V reverse standoff voltage is the DC working voltage — the TVS draws negligible leakage below this level, so it sits invisibly on a 94V rail or a 94V bus. Once the transient exceeds the minimum breakdown voltage of 105V, the device starts conducting and holds the line to 152V, protecting downstream silicon rated for that voltage class.
Bidirectional — one device for both polarities
This is a single bidirectional channel, meaning it clamps equally on positive and negative transients. For AC signal lines, data pairs, or bipolar power rails, one bidirectional TVS replaces two back-to-back unidirectional devices, saving board space and reducing component count. The symmetrical breakdown characteristic also simplifies layout — there is no polarity to observe during assembly.
Temperature range and package — industrial-grade through-hole
The DO-201AA / DO-27 axial package is a through-hole form factor — it handles higher surge energy than a surface-mount equivalent because the leadframe and body dissipate heat into the PCB traces and the surrounding air. The Bulk packaging means the parts are shipped loose in a bag or tube, not on tape-and-reel, which is typical for through-hole components destined for hand-insertion or wave-solder lines.