# ESD9X12ST5G

**onsemi** · ESD Protection Devices · SOD-923

ESD9X12ST5G 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 unidirectional TVS diode; for the ESD9X12ST5G the working peak reverse voltage VRWM is 12 V, with minimum breakdown VBR of 13.5 V at IT = 1.0 mA. |
| 2 | ANODE | passive | Anode terminal of the unidirectional TVS diode; the device is rated for maximum reverse peak pulse current IPP of 5.9 A with a clamping voltage VC of 23.7 V at maximum IPP. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOD-923 |
| Category | TVS/Fuse/Board Level Protection |
| 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 |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage | VBR | 13.5 |  |  | V | @ IT 1.0 mA (Note 2) | 2 |
| Maximum Reverse Leakage Current | IR |  |  | 1 | A | @ VRWM | 2 |
| Clamping Voltage | VC |  |  | 23.7 | V | @ Max IPP 5.9 A (Note 3) | 2 |
| Maximum Reverse Peak Pulse Current | IPP |  |  | 5.9 | A | (Note 3) | 2 |
| Max. Capacitance | C |  |  | 30 | pF | @ VR = 0 and f = 1 MHz | 2 |
| Forward Voltage | VF |  |  | 1.1 | V | @ IF = 10 mA | 2 |
| Peak Power Dissipation | Ppk |  | 140 |  | W | 8 x 20 s | 2 |
| Working Peak Reverse Voltage | VRWM |  |  | 12 | V |  | 2 |
| Total Power Dissipation on FR-5 Board (Note 1) @ TA = 25°C | PD |  |  | 150 | mW | FR-5 = 1.0 x 0.75 x 0.62 in. (Note 1) | 1 |
| Junction and Storage Temperature Range | TJ, Tstg | -55 |  | 150 | °C |  | 1 |
| Lead Solder Temperature - Maximum | TL |  |  | 260 | °C | 10 Second Duration | 1 |
| ESD Voltage Per Human Body Model |  |  |  | 16 | kV |  | 1 |
| ESD Voltage Per Machine Model |  |  |  | 400 | V |  | 1 |
| IEC 61000-4-2 (ESD) Contact |  | -30 |  | 30 | kV |  | 1 |
| IEC 61000-4-2 (ESD) Air |  | -30 |  | 30 | kV |  | 1 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | LEAD FINISH: 100% Matte Sn (Tin) MOUNTING POSITION: Any | 1 |

## CAD (KiCad official)

- Symbol: `ESD9X12ST5G`
- Footprint: `Diode_SMD:D_SOD-923`
- 3D model: SOD-923 (KiCad packages3D, STEP)
- 3D model files: `esd9x12st5g-etched.step` / `esd9x12st5g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `esd9x12st5g.step` / `esd9x12st5g.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/esd9x12st5-d.pdf) (5 pp, sha256 `a6ca23c32233bcdb`, retrieved 2026-11-06, 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/esd9x12st5g-datasheet.pdf)