# LY323DC18

**Liown** · ESD And Surge Protection (TVS/ESD) · SOD-323

LY323DC18 from Liown, 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 | 1 | passive | Terminal 1 of an unpolarised bidirectional ESD/TVS diode; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised bidirectional ESD/TVS diode; either orientation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Liown |
| 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 Working Voltage | VRWM |  |  | 18 | V |  | 2 |
| Reverse Breakdown Voltage | VBR | 19.8 |  |  | V | @IT=1mA | 2 |
| Reverse Leakage Current | IR |  |  | 0.2 | µA | @VRWM | 2 |
| Clamping Voltage | VC |  |  | 25 | V | @1A, 8/20µs | 2 |
| Clamping Voltage | VC |  |  | 38 | V | @IPP, 8/20µs | 2 |
| Peak Pulse Current | IPP |  |  | 13 | A | 8/20µs | 2 |
| Junction Capacitance | CJ |  |  | 60 | pF | @VR=0V, f=1MHz | 2 |
| Peak Pulse Power | PPP |  |  | 300 | W | 8/20µs, TA=25℃ | 2 |
| ESD per IEC 61000-4-2 (Air) | VESD | -30 |  | 30 | kV | TA=25℃ | 2 |
| ESD per IEC 61000-4-2 (Contact) | VESD | -30 |  | 30 | kV | TA=25℃ | 2 |
| Ambient Temperature Range | TA | -55 |  | 125 | ℃ |  | 2 |
| Storage Temperature Range | TSTG | -55 |  | 150 | ℃ |  | 2 |

## CAD (KiCad official)

- Symbol: `LY323DC18`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `ly323dc18-etched.step` / `ly323dc18-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ly323dc18.step` / `ly323dc18.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Liown datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590233210912612352) (5 pp, sha256 `9084788ab7776879`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `two-terminal 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/ly323dc18-datasheet.pdf)