# CH412K

**TECH PUBLIC** · ESD And Surge Protection (TVS/ESD) · SOT-363

CH412K from TECH PUBLIC, in a SOT-363. 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 | IO | passive | Protected data line I/O (0.3pF typical I/O to I/O, 0.6pF typical I/O to GND, ±25kV air / ±20kV contact ESD per IEC61000-4-2). |
| 2 | GND | power_in | Ground reference for the TVS array; I/O-GND clamping voltage is 16V max at IPP=4.5A (8/20µs). |
| 3 | IO | passive | Protected data line I/O (0.3pF typical I/O to I/O, 0.6pF typical I/O to GND, ±25kV air / ±20kV contact ESD per IEC61000-4-2). |
| 4 | IO | passive | Protected data line I/O (0.3pF typical I/O to I/O, 0.6pF typical I/O to GND, ±25kV air / ±20kV contact ESD per IEC61000-4-2). |
| 5 | VCC | power_in | Power line protection pin with 5V max reverse working voltage and 17V max clamping voltage (Vcc-GND) at IPP=10A (8/20µs). |
| 6 | IO | passive | Protected data line I/O (0.3pF typical I/O to I/O, 0.6pF typical I/O to GND, ±25kV air / ±20kV contact ESD per IEC61000-4-2). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TECH PUBLIC |
| Package | SOT-363 |
| Category | Circuit Protection |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `CH412K`
- Footprint: `Package_TO_SOT_SMD:SOT-363_SC-70-6`
- 3D model: SOT-363 (KiCad packages3D, STEP)
- 3D model files: `ch412k-etched.step` / `ch412k-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ch412k.step` / `ch412k.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TECH PUBLIC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603387077694812160) (4 pp, sha256 `1b738f4522650e2d`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (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/ch412k-datasheet.pdf)