# SMC24-323

**Leiditech** · ESD And Surge Protection (TVS/ESD) · SOT-323

SMC24-323 from Leiditech, in a SOT-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 | I/O1 | passive | Protected line 1 (diode anode side in the pin configuration drawing), 24V working voltage, clamps to common pin 3 with ±30kV IEC 61000-4-2 ESD protection. |
| 2 | I/O2 | passive | Protected line 2 (diode anode side in the pin configuration drawing), 24V working voltage, clamps to common pin 3 with ±30kV IEC 61000-4-2 ESD protection. |
| 3 | COMMON | passive | Common pin shared by both TVS diode paths from pins 1 and 2, the datasheet does not label it as GND. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Leiditech |
| Package | SOT-323 |
| Category | Circuit Protection |
| Pins | 3 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Clamping voltage (max 48 V at 3 A column) | Vc |  | 39 | 48 | V | VC @1A header; '(@A)' column = 3 | 2 |
| Leakage current (max) | IR |  |  | 10 |  |  | 2 |
| ESD immunity, air discharge (IEC 61000-4-2) | VESD | -30 |  | 30 | kV | Air discharge, IEC 61000-4-2 | 1 |
| ESD immunity, contact discharge (IEC 61000-4-2) | VESD | -30 |  | 30 | kV | Contact discharge, IEC 61000-4-2 | 1 |
| Peak pulse power | Ppp |  |  | 200 | W | 8/20µs | 1 |
| Operating temperature range | TJ | -55 |  | 125 | ℃ |  | 1 |
| Storage temperature range | TSTJ | -55 |  | 150 | ℃ |  | 1 |
| Breakdown voltage | VBR |  | 26.5 |  | V | IT = 1 mA | 2 |
| Reverse working voltage | VRWM |  | 24 |  | V |  | 2 |
| Capacitance | C |  | 18 |  | Pf |  | 2 |

## CAD (KiCad official)

- Symbol: `SMC24-323`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `smc24-323-etched.step` / `smc24-323-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smc24-323.step` / `smc24-323.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Leiditech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588904732727652352) (3 pp, sha256 `143b2517fb835e17`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/smc24-323-datasheet.pdf)