# CJE3139K

**Changjing** · MOSFETs · SOT-523

CJE3139K from Changjing, in a SOT-523. 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 CJE3139K P-channel MOSFET, with a gate-source voltage rating of ±12 V as listed in the maximum ratings. |
| 2 | SOURCE | passive | Source terminal of the P-channel MOSFET, serving as the reference for VGS; the datasheet gives no separate source-pin rating. |
| 3 | DRAIN | passive | Drain terminal of the P-channel MOSFET, rated for a drain-source voltage of -20 V and a continuous drain current of -0.66 A (note 1, surface-mounted on FR4 at minimum recommended pad size). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-523 |
| 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 | -20 |  |  | V |  | 1 |
| Gate-Source Voltage | VGS | -12 |  | 12 | V |  | 1 |
| Continuous Drain Current (note 1) | ID | -0.66 |  |  | A |  | 1 |
| Pulsed Drain Current | IDM | -1.2 |  |  | A | tp=10μs | 1 |
| Power Dissipation (note 1) | PD |  |  | 150 | mW | note 1: surface mounted on FR4, minimum recommended pad size | 1 |
| Thermal Resistance from Junction to Ambient (note 1) | RθJA |  |  | 833 | ℃/W | note 1: surface mounted on FR4, minimum recommended pad size | 1 |
| Junction Temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Lead Temperature for Soldering Purposes | TL |  |  | 260 | ℃ | 1/8" from case for 10 s | 1 |
| Drain-source breakdown voltage | V(BR)DSS | -20 |  |  | V | VGS = 0V, ID = -250µA | 2 |
| Zero gate voltage drain current | IDSS |  |  | -1 | µA | VDS = -20V, VGS = 0V | 2 |
| Gate-body leakage current | IGSS | -20 |  | 20 | µA | VGS = ±10V, VDS = 0V | 2 |
| Gate threshold voltage (note 2) | VGS(th) | -0.35 |  | -1.1 | V | VDS = VGS, ID = -250µA | 2 |
| Drain-source on-resistance (note 2) | RDS(on) |  |  | 520 | mΩ | VGS = -4.5V, ID = -1A | 2 |
| Drain-source on-resistance (note 2) | RDS(on) |  |  | 700 | mΩ | VGS = -2.5V, ID = -0.8A | 2 |
| Drain-source on-resistance (note 2) | RDS(on) |  | 950 |  | mΩ | VGS = -1.8V, ID = -0.5A | 2 |
| Forward transconductance (note 2) | gFS |  | 1.2 |  | S | VDS = -10V, ID = -0.54A | 2 |
| Diode forward voltage | VSD |  |  | -1.2 | V | IS = -0.5A, VGS = 0V | 2 |
| Input capacitance | Ciss |  | 113 | 170 | pF | VDS = -16V, VGS = 0V, f = 1MHz | 2 |
| Output capacitance | Coss |  | 15 | 25 | pF | VDS = -16V, VGS = 0V, f = 1MHz | 2 |
| Reverse transfer capacitance | Crss |  | 9 | 15 | pF | VDS = -16V, VGS = 0V, f = 1MHz | 2 |
| Turn-on delay time (note 3) | td(on) |  | 9 |  | ns | VGS = -4.5V, VDS = -10V, ID = -200mA, RGEN = 10Ω | 2 |
| Turn-on rise time (note 3) | tr |  | 5.8 |  | ns | VGS = -4.5V, VDS = -10V, ID = -200mA, RGEN = 10Ω | 2 |
| Turn-off delay time (note 3) | td(off) |  | 32.7 |  | ns | VGS = -4.5V, VDS = -10V, ID = -200mA, RGEN = 10Ω | 2 |
| Turn-off fall time (note 3) | tf |  | 20.3 |  | ns | VGS = -4.5V, VDS = -10V, ID = -200mA, RGEN = 10Ω | 2 |

## CAD (KiCad official)

- Symbol: `CJE3139K`
- Footprint: `Package_TO_SOT_SMD:SOT-523`
- 3D model: SOT-523, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.8 mm nominal SOT-523 height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `cje3139k-etched.step` / `cje3139k-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cje3139k.step` / `cje3139k.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/8586202724824596480) (5 pp, sha256 `2c1d1d8755b4b4a8`, 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/cje3139k-datasheet.pdf)