# MM1Z3V9B

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

MM1Z3V9B from Shandong Jingdao Microelectronics, 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 | Cathode | passive | Zener cathode terminal per the PINNING table; the device is rated for 500 mW maximum total power dissipation and Tj/Tstg of -55 to +150 °C. |
| 2 | Anode | passive | Zener anode terminal per the PINNING table; the datasheet gives a forward voltage of 0.9 V at IF = 10 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shandong Jingdao Microelectronics |
| 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 (VZT) for MM1Z3V9B | VZT | 3.82 | 3.9 | 3.98 | V | at IZT; VZT tested with pulses (20 ms) | 2 |
| Zener voltage tolerance |  | -2 |  | 2 | % |  | 1 |
| Dynamic impedance (ZZT) | ZZT |  |  | 130 | Ω | at IZT | 2 |
| Power dissipation | Ptot |  |  | 500 | mW |  | 1 |
| Operating and storage temperature range | Tj, Tstg | -55 |  | 150 | °C |  | 1 |
| Test current (IZT) | IZT |  | 5 |  | mA |  | 2 |
| Forward voltage | VF |  | 0.9 |  | V | IF = 10 mA | 1 |
| Thermal resistance, junction to ambient | RθJA |  | 340 |  | °C/W | PCB mounted with 2.0" x 2.0" (5 x 5 cm) copper pads | 1 |

## CAD (KiCad official)

- Symbol: `MM1Z3V9B`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `mm1z3v9b-etched.step` / `mm1z3v9b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mm1z3v9b.step` / `mm1z3v9b.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/8588903916235210752) (3 pp, sha256 `b0fd93ec2c97a609`, retrieved 2026-10-17, 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/mm1z3v9b-datasheet.pdf)