# MM1W39

**Shandong Jingdao Microelectronics** · Zener Diodes · SOD-123

MM1W39 from Shandong Jingdao Microelectronics, in a SOD-123. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | K | passive | Cathode terminal of the zener diode. Marked as pin 1 on the SOD-123 package (typically the banded end). |
| 2 | A | passive | Anode terminal of the zener diode. Marked as pin 2 on the SOD-123 package. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shandong Jingdao Microelectronics |
| Package | SOD-123 |
| Category | Diodes |
| Pins | 2 |

## Ordering variants

Same part, different packaging or reel option.

- `MM1W39`

## CAD (KiCad official)

- Symbol: `MM1W39`
- Footprint: `Diode_SMD:D_SOD-123`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `mm1w39-etched.step` / `mm1w39-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mm1w39.step` / `mm1w39.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shandong Jingdao Microelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588911852134391808) (3 pp, sha256 `013135782e49243c`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/mm1w39-datasheet.pdf)