# ESD9X3.3ST5G

**onsemi** · ESD And Surge Protection (TVS/ESD) · SOD-923

ESD9X3.3ST5G from onsemi, in a SOD-923. 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 uni-directional TVS diode; the datasheet gives the device ESD ratings (16 kV Human Body Model, ±30 kV IEC 61000-4-2 contact) and a working peak reverse voltage of 3.3 V for this part but no separate limit specific to this pin. |
| 2 | ANODE | passive | Anode terminal of the uni-directional TVS diode, connected to the reference node opposite the cathode; the datasheet gives no separate electrical limit specific to this pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOD-923 |
| Category | Circuit Protection |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `ESD9X3.3ST5G`
- Footprint: `Diode_SMD:D_SOD-923`
- 3D model: SOD-923 (KiCad packages3D, STEP)
- 3D model files: `esd9x3-3st5g-etched.step` / `esd9x3-3st5g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `esd9x3-3st5g.step` / `esd9x3-3st5g.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/8588881717482967040) (6 pp, sha256 `b0d798e9a8af528a`, retrieved 2026-10-12, 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/esd9x3-3st5g-datasheet.pdf)