# MM3Z18VC

**onsemi** · Zener Diodes · SOD-323FL

MM3Z18VC from onsemi, in a SOD-323FL. 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 | ANODE | passive | Anode terminal of the Zener diode, per the connection diagram; the datasheet gives no further electrical limits for this pin. |
| 2 | CATHODE | passive | Cathode terminal of the Zener diode, identified by the band on the package (Band Denotes Cathode); the datasheet gives no further electrical limits for this pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOD-323FL |
| 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 | VZ | 17.1 | 18 | 18.9 | V | @ IZT = 5 mA, pulse 10 ms | 2 |
| Zener voltage tolerance (C series) | VZ | -5 |  | 5 | % | Standard tolerance on nominal zener voltage | 2 |
| Zener impedance | ZZT |  |  | 42 | Ω | @ IZT = 5 mA | 2 |
| Zener impedance (knee) | ZZK |  |  | 212 | Ω | @ IZK = 1 mA | 2 |
| Reverse current | IR |  |  | 0.045 | µA | @ VR = 12.6 V | 2 |
| Forward voltage | VF |  |  | 1 | V | IF = 10 mA | 1 |
| Power dissipation | PD |  |  | 200 | mW | TA = 25°C | 1 |
| Maximum junction temperature | TJ |  |  | 150 | °C |  | 1 |
| Storage temperature range | TSTG | -65 |  | 150 | °C |  | 1 |
| Thermal resistance, junction to ambient | RJA |  | 595 |  | °C/W | Device mounted on PCB with minimum land pad | 1 |

## CAD (KiCad official)

- Symbol: `MM3Z18VC`
- Footprint: `Diode_SMD:D_SOD-323F`
- 3D model: SOD-323FL (KiCad packages3D, STEP)
- 3D model files: `mm3z18vc-etched.step` / `mm3z18vc-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mm3z18vc.step` / `mm3z18vc.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589981866301558784) (6 pp, sha256 `117bb783d3db4c57`, retrieved 2026-10-15, 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/mm3z18vc-datasheet.pdf)