# CJ3406

**Changjing** · MOSFETs · SOT-23

CJ3406 from Changjing, in a SOT-23. 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 | GATE | input | Gate of the N-channel MOSFET; the datasheet gives VGS(th) of 1 to 3 V at VDS = VGS and ID = 250 µA and a absolute gate-source voltage rating of ±20 V. |
| 2 | SOURCE | passive | Source of the N-channel MOSFET; the device is rated for a drain-source voltage VDS of 30 V and a continuous drain current ID of 3.6 A. |
| 3 | DRAIN | passive | Drain of the N-channel MOSFET; the device is rated for a pulsed drain current IDM of 15 A and a power dissipation PD of 0.35 W. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| 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 |
|---|---|---|---|---|---|---|---|
| Drain-Source Voltage | VDS |  |  | 30 | V |  | 1 |
| Gate-Source Voltage | VGS | -20 |  | 20 | V |  | 1 |
| Continuous Drain Current | ID |  |  | 3.6 | A |  | 1 |
| Drain Current-Pulsed | IDM |  |  | 15 | A | Repetitive rating: pulse width limited by maximum junction temperature (note 1) | 1 |
| Power Dissipation | PD |  |  | 0.35 | W |  | 1 |
| Junction Temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance from Junction to Ambient | RθJA |  |  | 357 | ℃/W |  | 1 |
| Drain-source breakdown voltage | V(BR)DSS | 30 |  |  | V | VGS = 0V, ID = 250µA | 2 |
| Zero gate voltage drain current | IDSS |  |  | 1 | µA | VDS = 24V, VGS = 0V | 2 |
| Gate-body leakage current | IGSS | -100 |  | 100 | nA | VGS = ±20V, VDS = 0V | 2 |
| Gate threshold voltage | VGS(th) | 1 |  | 3 | V | VDS = VGS, ID = 250µA | 2 |
| Drain-source on-resistance | RDS(on) |  |  | 65 | mΩ | VGS = 10V, ID = 3.6A | 2 |
| Drain-source on-resistance | RDS(on) |  |  | 105 | mΩ | VGS = 4.5V, ID = 2.8A | 2 |
| Forward transconductance | gFS | 3 |  |  | S | VDS = 5V, ID = 3.6A | 2 |
| Diode forward voltage | VSD |  |  | 1 | V | IS = 1A | 2 |

## CAD (KiCad official)

- Symbol: `CJ3406`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `cj3406-etched.step` / `cj3406-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cj3406.step` / `cj3406.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586181336118284288) (5 pp, sha256 `46a7c1e04ebfdeab`, retrieved 2026-10-18, tier: lcsc)
- **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/cj3406-datasheet.pdf)