# CJ3400

**Changjing** · MOSFETs · SOT-23

CJ3400 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, rated for a gate-source voltage VGS of ±12 V maximum. |
| 2 | SOURCE | passive | Source of the N-channel MOSFET; the datasheet gives no separate pin-level limit, and the 30 V drain-source voltage rating (VDS) applies between drain and source. |
| 3 | DRAIN | passive | Drain of the N-channel MOSFET, rated for a drain-source voltage VDS of 30 V and a continuous drain current ID of 5.8 A. |

## 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 | -12 |  | 12 | V |  | 1 |
| Continuous Drain Current | ID |  |  | 5.8 | A |  | 1 |
| Drain Current-Pulsed | IDM |  |  | 30 | A |  | 1 |
| Power Dissipation | PD |  |  | 350 | mW |  | 1 |
| Junction Temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance from Junction to Ambient | RθJA |  |  | 357 | ℃/W | Surface mounted on FR4 board, t < 5 sec (note 2) | 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-source leakage current | IGSS | -100 |  | 100 | nA | VGS =±12V, VDS = 0V | 2 |
| Drain-source on-resistance | RDS(on) |  |  | 35 | mΩ | VGS =10V, ID =5.8A | 2 |
| Drain-source on-resistance | RDS(on) |  |  | 40 | mΩ | VGS =4.5V, ID =5A | 2 |
| Drain-source on-resistance | RDS(on) |  |  | 52 | mΩ | VGS =2.5V,ID=4A | 2 |
| Forward transconductance | gFS | 8 |  |  | S | VDS =5V, ID =5A | 2 |
| Gate threshold voltage | VGS(th) | 0.7 |  | 1.4 | V | VDS =VGS, ID =250µA | 2 |
| Diode forward voltage | VSD |  |  | 1 | V | IS=1A,VGS=0V | 2 |
| Input capacitance | Ciss |  | 1050 |  | pF |  | 2 |
| Output capacitance | Coss |  | 99 |  | pF |  | 2 |
| Reverse transfer capacitance | Crss |  | 77 |  | pF | VDS =15V,VGS =0V,f =1MHz | 2 |
| Gate resistance | Rg |  | 3.6 |  | Ω | VDS =0V,VGS =0V,f =1MHz | 2 |
| Turn-on delay time | td(on) |  | 5 |  | ns | VGS=10V,VDS=15V, RL=2.7Ω,RGEN=3Ω | 2 |
| Turn-on rise time | tr |  | 7 |  | ns | VGS=10V,VDS=15V, RL=2.7Ω,RGEN=3Ω | 2 |
| Turn-off delay time | td(off) |  | 40 |  | ns | VGS=10V,VDS=15V, RL=2.7Ω,RGEN=3Ω | 2 |
| Turn-off fall time | tf |  | 6 |  | ns | VGS=10V,VDS=15V, RL=2.7Ω,RGEN=3Ω | 2 |

## CAD (KiCad official)

- Symbol: `CJ3400`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `cj3400-etched.step` / `cj3400-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cj3400.step` / `cj3400.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/8586171665587429376) (3 pp, sha256 `f9216dcf9e46204c`, retrieved 2026-10-09, 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/cj3400-datasheet.pdf)