# MMBZ20VALT1G

**onsemi** · ESD And Surge Protection (TVS/ESD) · SOT-23

MMBZ20VALT1G from onsemi, in a SOT-23. 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 1 | passive | Cathode of the first Zener junction in the dual common-anode device; for a unidirectional configuration it is tied to pin 3 (ANODE) per the datasheet's circuit note (pins 1 and 3 or 2 and 3). |
| 2 | CATHODE 2 | passive | Cathode of the second Zener junction in the dual common-anode device; for a unidirectional configuration it is tied to pin 3 (ANODE) per the datasheet's circuit note (pins 2 and 3 or 1 and 3). |
| 3 | ANODE | passive | Common anode shared by both Zener junctions, which the datasheet says allows either two separate unidirectional configurations or a single bidirectional configuration. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOT-23 |
| Category | Circuit Protection |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `MMBZ20VALT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmbz20valt1g-etched.step` / `mmbz20valt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbz20valt1g.step` / `mmbz20valt1g.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/8586188999115751424) (9 pp, sha256 `4e26688519a3202b`, retrieved 2026-10-09, 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/mmbz20valt1g-datasheet.pdf)