# MMSZ10

**DOWO** · Zener Diodes · SOD-123

MMSZ10 from DOWO, in a SOD-123. 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 end marked by the color band; the zener voltage is 10V nominal (9.50V to 10.50V) at the test current, with 500mW maximum power dissipation. |
| 2 | A | passive | Anode, the end opposite the color band; forward voltage is 0.9V at IF=10mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | DOWO |
| Package | SOD-123 |
| 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 (VZ1), minimum | VZ1 | 9.5 |  |  | V |  | 2 |
| Zener voltage (VZ1), nominal | VZ1 |  | 10 |  | V |  | 2 |
| Zener voltage (VZ1), maximum | VZ1 |  |  | 10.5 | V |  | 2 |
| Zener voltage (VZ2), minimum | VZ2 | 9.3 |  |  | V |  | 2 |
| Zener voltage (VZ2), maximum | VZ2 |  |  | 10.6 | V |  | 2 |
| Zener impedance | ZZT |  | 20 |  | Ω | @IZ=IZT | 2 |
| Zener impedance | ZZK |  | 150 |  | Ω | @IZK | 2 |
| Reverse current | IR |  | 0.2 |  | uA | @VR=7.0 V | 2 |
| Power dissipation | Pd |  |  | 500 | mW |  | 1 |
| Forward voltage | Vf |  | 0.9 |  | V | @IF=10mA | 1 |
| Thermal resistance from junction to ambient | RθJA |  | 357 |  | ℃/W |  | 1 |
| Junction temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage temperature range | TsTG | -65 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `MMSZ10`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `mmsz10-etched.step` / `mmsz10-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmsz10.step` / `mmsz10.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [DOWO datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590917957755084800) (3 pp, sha256 `9e10c71fe8aa41a1`, retrieved 2026-10-17, 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/mmsz10-datasheet.pdf)