# ESD9R3.3ST5G

**onsemi** · TVS · SOD-923

ESD9R3.3ST5G 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 of the ESD protection diode, identified by the polarity band on the package (Style 1), and the diode clamps ESD events to a safe level for the IC. |
| 2 | ANODE | passive | Anode of the ESD protection diode (Style 1), which connects to the signal or ground side of the line being protected. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOD-923 |
| Category | Circuit 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 |
|---|---|---|---|---|---|---|---|
| Working Peak Reverse Voltage | VRWM |  |  | 3.3 | V |  | 2 |
| Maximum Reverse Leakage Current | IR |  |  | 1 | nA | @ 1 V, TA = 0°C to 50°C (Note 4) | 2 |
| Breakdown Voltage | VBR | 4.8 |  |  | V | @ IT = 1.0 mA (Note 2) | 2 |
| Clamping Voltage | VC |  |  | 7.8 | V | @ IPP = 1 A (Note 5) | 2 |
| Max. Capacitance | C |  | 0.5 | 0.9 | pF | @ VR = 0 and f = 1.0 MHz | 2 |
| IEC 61000-4-2 (ESD) Contact |  | -10 |  | 10 | kV |  | 1 |
| IEC 61000-4-2 (ESD) Air |  | -15 |  | 15 | kV |  | 1 |
| HBM (ESD) |  | -16 |  | 16 | kV |  | 1 |
| Total Power Dissipation on FR-5 Board | PD |  |  | 150 | mW | FR-5 board (Note 1) @ TA = 25°C | 1 |
| Storage Temperature Range | Tstg | -55 |  | 150 | °C |  | 1 |
| Junction Temperature Range | TJ | -55 |  | 125 | °C |  | 1 |
| Lead Solder Temperature - Maximum | TL |  |  | 260 | °C | 10 second duration | 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: `ESD9R3.3ST5G`
- Footprint: `Diode_SMD:D_SOD-923`
- 3D model: SOD-923 (KiCad packages3D, STEP)
- 3D model files: `esd9r3-3st5g-etched.step` / `esd9r3-3st5g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `esd9r3-3st5g.step` / `esd9r3-3st5g.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/esd9r3.3st5-d.pdf) (5 pp, sha256 `2894dd3dfd31f6a1`, 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/esd9r3-3st5g-datasheet.pdf)