# MM3Z27-MS

**MSKSEMI** · Zener Diodes · SOD-323

MM3Z27-MS from MSKSEMI, in a SOD-323. 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 | Cathode | passive | Cathode of the zener diode; for MM3Z27-MS the zener voltage is 25.1V min to 28.9V max at IZT = 2 mA. |
| 2 | Anode | passive | Anode of the zener diode; the device has a total power dissipation of 200 mW max. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | SOD-323 |
| 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 Test Current | IZT |  | 2 |  | mA |  | 3 |
| Dynamic Impedance | ZZT |  |  | 70 | Ω | at IZT | 3 |
| Reverse Current | IR |  |  | 0.1 | μA | at VR = 21 V | 3 |
| Reverse Voltage for IR test | VR |  | 21 |  | V |  | 3 |
| Power Dissipation | Ptot |  |  | 200 | mW | Ta = 25°C | 2 |
| Forward Voltage | VF |  |  | 0.9 | V | IF = 10 mA | 2 |
| Thermal Resistance Junction to Ambient | RθJA |  | 417 |  | °C/W | P.C.B. mounted with 2.0" X 2.0" copper pads | 2 |
| Operating and Storage Temperature Range | Tj, Tstg | -55 |  | 150 | °C |  | 2 |
| Zener Voltage Tolerance |  | -5 |  | 5 | % | Tolerance approximately ±5% | 2 |

## CAD (KiCad official)

- Symbol: `MM3Z27-MS`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `mm3z27-ms-etched.step` / `mm3z27-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mm3z27-ms.step` / `mm3z27-ms.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603385855574749184) (5 pp, sha256 `ad4064742873770b`, 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/mm3z27-ms-datasheet.pdf)