# MM3Z3V3B

**onsemi** · Zener Diodes · SOD-323F

MM3Z3V3B from onsemi, in a SOD-323F. 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 | Band-side terminal of the Zener diode (the datasheet states the band denotes cathode); for MM3Z3V3B the nominal Zener voltage is 3.3 V with 3.23 V min and 3.37 V max at IZT = 5 mA. |
| 2 | A | passive | Non-band terminal of the Zener diode, opposite the cathode; for MM3Z3V3B the maximum reverse current is 4.5 µA at VR = 1 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOD-323F |
| 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 | 3.23 | 3.3 | 3.37 | V | @ IZT = 5 mA; pulse test 10 ms (Note 1) | 3 |
| Zener voltage tolerance (B series) |  | -2 |  | 2 | % | Standard tolerance on nominal zener voltage (B suffix) | 3 |
| Zener impedance | ZZT |  |  | 89 | Ω | @ IZT = 5 mA | 3 |
| Zener knee impedance | ZZK |  |  | 564 | Ω | @ IZK = 1 mA | 3 |
| Reverse leakage current | IR |  |  | 4.5 | μA | @ VR = 1 V | 3 |
| Forward voltage | VF |  |  | 1 | V | IF = 10 mA | 2 |
| Power dissipation | PD |  |  | 200 | mW |  | 2 |
| Storage temperature range | TSTG | -65 |  | 150 | °C |  | 2 |
| Maximum junction temperature | TJ |  |  | 150 | °C |  | 2 |
| Thermal resistance, junction to ambient | RθJA |  |  | 595 | °C/W | Device mounted on FR-4 PCB minimum land pad | 2 |

## CAD (KiCad official)

- Symbol: `MM3Z3V3B`
- Footprint: `Diode_SMD:D_SOD-323F`
- 3D model: SOD-323F (KiCad packages3D, STEP)
- 3D model files: `mm3z3v3b-etched.step` / `mm3z3v3b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mm3z3v3b.step` / `mm3z3v3b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/mm3z3v3b-d.pdf) (8 pp, sha256 `ccf699fde8c84be0`, retrieved 2026-10-21, tier: manufacturer)
- **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/mm3z3v3b-datasheet.pdf)