# 1N4001

**MDD Microdiode Semiconductor** · Diodes - General Purpose · DO-41

1N4001 from MDD Microdiode Semiconductor, 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 lead, the end marked with the polarity band on the body; 1.0 (25.4) mm minimum lead length, 0.025-0.021 in (0.65-0.55 mm) diameter. |
| 2 | A | passive | Anode lead, the end opposite the polarity band; 1.0 (25.4) mm minimum lead length, 0.025-0.021 in (0.65-0.55 mm) diameter. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MDD Microdiode Semiconductor |
| Package | DO-41 |
| Category | Diodes |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `1N4001`
- 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:** [MDD Microdiode Semiconductor datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588887224012722176) (2 pp, sha256 `ffae0d0920118799`, retrieved 2026-10-12, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+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/1n4001-datasheet.pdf)