# LL4148 LL34

**TDSEMIC** · Switching Diodes · LL-34

LL4148 LL34 from TDSEMIC, in a LL-34. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | K | passive | Cathode, identified by the cathode mark band on the LL-34 glass MiniMELF case; reverse voltage VR 75 V (peak VRM 100 V). |
| 2 | A | passive | Anode at the end opposite the cathode band; average rectified forward current IF(AV) 200 mA, VF max 1 V at IF = 10 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TDSEMIC |
| Package | LL-34 |
| Category | Diodes |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `LL4148 LL34`
- Footprint: `Diode_SMD:D_MiniMELF`
- 3D model: LL-34 (KiCad packages3D, STEP)

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [TDSEMIC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8618862698121875456) (5 pp, sha256 `0e430cb53e6d405e`, retrieved 2026-10-12, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (vision), consensus `claude-opus-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ll4148-ll34-datasheet.pdf)