# 1N4744

**LGE** · Zener Diodes · DO-41

1N4744 from LGE, in a DO-41. 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, marked by the cathode band; zener voltage 15 V at IZT=17 mA, with maximum power dissipation of 1.0 W. |
| 2 | A | passive | Anode terminal of the zener diode; forward voltage max 1.2 V at IF=200 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LGE |
| Package | DO-41 |
| 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 |
|---|---|---|---|---|---|---|---|
| Nominal zener voltage tolerance | VZ tol | -10 |  | 10 | % | Standard zener voltage tolerance; suffix A is ±5% | 1 |
| Zener dynamic impedance | ZZT |  |  | 14 | Ω | @IZT | 2 |
| Zener knee dynamic impedance | ZZK |  |  | 700 | Ω | @IZK | 2 |
| Forward voltage | VF |  |  | 1.2 | V | IF=200mA | 1 |
| Nominal zener voltage | VZ |  | 15 |  | V | @IZT | 2 |
| Test current | IZT |  | 17 |  | mA |  | 2 |
| Power dissipation | PDiss |  |  | 1 | W | @ Tamb 50 | 1 |
| Junction temperature | TJ |  |  | 200 | °C |  | 1 |
| Storage temperature range | Ts | -55 |  | 200 | °C |  | 1 |
| Thermal resistance junction to ambient | RThJA |  |  | 100 | K/W | l=9.5mm(3/8"), TL=constant | 1 |

## CAD (KiCad official)

- Symbol: `1N4744`
- Footprint: `Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal`
- 3D model: DO-41 (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [LGE datasheet](docs/1n4744-datasheet.pdf) (3 pp, sha256 `de140b189f28902d`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-sonnet-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/1n4744-datasheet.pdf)