# CJ3139KW

**Changjing** · MOSFETs · SOT-323

CJ3139KW from Changjing, 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 | GATE | input | Gate terminal of the P-channel MOSFET, with gate-source voltage rated at ±12 V (VGS). |
| 2 | SOURCE | passive | Source terminal of the P-channel MOSFET, in a device rated for drain-source voltage VDSS of -20 V. |
| 3 | DRAIN | passive | Drain terminal of the P-channel MOSFET, rated for continuous drain current ID of -0.66 A and pulsed current IDM of -2.64 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-323 |
| 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 | VDSS | -20 |  |  | V |  | 1 |
| Gate-Source voltage | VGS | -12 |  | 12 | V |  | 1 |
| Drain Current-Continuous | ID | -0.66 |  |  | A |  | 1 |
| Drain Current-Pulsed | IDM | -2.64 |  |  | A | Repetitive rating, pulse width limited by maximum junction temperature (note 1) | 1 |
| Power Dissipation | PD |  |  | 200 | mW | note 2: no heat sink at Ta=25℃ | 1 |
| Thermal Resistance from Junction to Ambient | RθJA |  |  | 625 | ℃/W |  | 1 |
| Junction Temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Drain-Source Breakdown Voltage | V(BR)DSS | -20 |  |  | V | VGS = 0V, ID =-250µA | 2 |
| Gate-Threshold Voltage | VGS(th) | -0.35 | -0.45 | -1.1 | V | VDS =VGS, ID =-250µA | 2 |
| Gate-Body Leakage Current | IGSS | -20 |  | 20 | µA | VDS =0V, VGS =±10V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -1 | µA | VDS =-20V, VGS =0V | 2 |
| Drain-Source On-State Resistance | RDS(on) |  | 430 | 520 | mΩ | VGS =-4.5V, ID =-1A | 2 |
| Drain-Source On-State Resistance | RDS(on) |  | 624 | 700 | mΩ | VGS =-2.5V, ID =-800mA | 2 |
| Drain-Source On-State Resistance | RDS(on) |  |  | 950 | mΩ | VGS =-1.8V, ID =-500mA | 2 |
| Drain-Source Diode Forward Voltage | VSD |  |  | -1.2 | V | IS=-0.5A, VGS = 0V | 2 |

## CAD (KiCad official)

- Symbol: `CJ3139KW`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `cj3139kw-etched.step` / `cj3139kw-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cj3139kw.step` / `cj3139kw.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/8588918261535031296) (5 pp, sha256 `dbc2b042ba15d7d0`, 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/cj3139kw-datasheet.pdf)