# DL4743A

**LGE** · Zener Diodes · MELF

DL4743A from LGE, in a MELF. 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LGE |
| Package | MELF |
| Category | Diodes |
| Pins | 2 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Zener voltage tolerance |  | -5 |  | 5 | % | suffix A | 1 |
| Nominal zener voltage | Vz |  | 13 |  | V | DL4743 nominal | 2 |
| Test current | IZT |  | 19 |  | mA | DL4743 | 2 |
| Maximum dynamic impedance | ZZT |  | 10 |  | Ω | at IZT | 2 |
| Maximum dynamic impedance knee | ZZK |  | 700 |  | Ω | at IZK | 2 |
| Forward voltage | VF |  |  | 1.2 | V | IF=200mA | 1 |
| Power dissipation | PDiss |  |  | 1 | W | Tamb 50 | 1 |
| Junction temperature | TJ |  |  | 175 | °C |  | 1 |
| Storage temperature range | Ts | -55 |  | 175 | °C |  | 1 |
| Junction to ambient thermal resistance | RThJA |  | 170 |  | K/W | Junction ambient I=9.5mm(3/8 ), TL=constant | 1 |

## CAD (KiCad official)

- Symbol: `DL4743A`
- Footprint: `Diode_SMD:D_MELF`
- 3D model: MELF (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [LGE datasheet](docs/dl4743a-datasheet.pdf) (3 pp, sha256 `a224b6085d68189f`, retrieved 2026-10-28, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/dl4743a-datasheet.pdf)