# ESD18VD3

**Yangzhou Yangjie Elec Tech** · ESD And Surge Protection (TVS/ESD) · SOD-323

ESD18VD3 from Yangzhou Yangjie Elec Tech, in a SOD-323. 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 | K | passive | Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | SOD-323 |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse maximum working voltage | VRWM |  |  | 18 | V |  | 2 |
| Reverse leakage current | IR |  |  | 0.5 | μA | VRWM = 18V | 2 |
| Reverse breakdown voltage | VBR | 19 |  |  | V | IBR = 1mA | 2 |
| Clamping voltage (TLP) | VCL |  | 26 |  | V | IPP = 16A, tp = 100ns | 2 |
| Clamping voltage | VCL |  | 23 | 27 | V | IPP = 1A, tp = 8/20μs | 2 |
| Clamping voltage | VCL |  | 32 | 38 | V | IPP = 8A, tp = 8/20μs | 2 |
| Junction capacitance | CJ |  | 39 | 55 | pF | VR = 0V, f = 1MHz | 2 |
| Dynamic resistance | RDYN |  | 0.35 |  | Ω |  | 2 |
| Peak pulse power | Ppk |  |  | 300 | W | tp = 8/20μs | 2 |
| Peak pulse current | IPP |  |  | 8 | A | tp = 8/20μs | 2 |
| ESD air discharge | VESD | -30 |  | 30 | KV | IEC61000-4-2 air discharge | 2 |
| ESD contact discharge | VESD | -30 |  | 30 | KV | IEC61000-4-2 contact discharge | 2 |
| Junction temperature | TJ | -55 |  | 125 | °C |  | 2 |
| Storage temperature | TSTG | -55 |  | 150 | °C |  | 2 |

## 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: Matte Tin ● Case Material: “Green” Molding Compound | 1 |

## CAD (KiCad official)

- Symbol: `ESD18VD3`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `esd18vd3-etched.step` / `esd18vd3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `esd18vd3.step` / `esd18vd3.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](docs/esd18vd3-datasheet.pdf) (5 pp, sha256 `dccbee09ca8cdf05`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/esd18vd3-datasheet.pdf)