# MM3Z16

**ST Semtech** · Zener Diodes · SOD-323

MM3Z16 from ST Semtech, 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 terminal of the Zener diode, identified as pin 1 in the PINNING table for the SOD-323 package; the datasheet gives no pin-specific electrical limit beyond the device ratings (Ptot 300 mW, Tj 150 °C). |
| 2 | Anode | passive | Anode terminal of the Zener diode, identified as pin 2 in the PINNING table for the SOD-323 package; the datasheet gives no pin-specific electrical limit beyond the device ratings (Ptot 300 mW, Tj 150 °C). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ST Semtech |
| 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 |
|---|---|---|---|---|---|---|---|
| Dynamic impedance at IZT | ZZT |  |  | 40 | Ω | IZT = 5 mA | 2 |
| Reverse leakage current | IR |  |  | 0.1 | µA | VR = 12 V | 2 |
| Forward voltage | VF |  |  | 0.9 | V | IF = 10 mA, Ta = 25 °C | 1 |
| Thermal resistance junction to ambient air | RθJA |  |  | 417 | °C/W | Ta = 25 °C | 1 |
| Total power dissipation | Ptot |  |  | 300 | mW | Ta = 25 °C | 1 |
| Junction temperature | Tj |  |  | 150 | °C |  | 1 |
| Storage temperature range | Tstg | -55 |  | 150 | °C |  | 1 |
| Zener voltage tolerance (approximate) |  | -5 |  | 5 | % | Printed as 'Tolerance approximately ± 5%' in features; general for the series, not a part-numbering decode | 1 |

## CAD (KiCad official)

- Symbol: `MM3Z16`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `mm3z16-etched.step` / `mm3z16-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mm3z16.step` / `mm3z16.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ST Semtech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586185399626567680) (4 pp, sha256 `8fc2587390375e70`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/mm3z16-datasheet.pdf)