# CJ8820

**Changjing** · MOSFETs · SOT-23

CJ8820 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 terminal of the MOSFET; the datasheet gives a gate-source voltage rating of ±12 V (VGS). |
| 2 | SOURCE | passive | Source terminal of the MOSFET; the datasheet gives no source-specific limit beyond the device ratings (VDS 20 V, ID 7 A continuous). |
| 3 | DRAIN | passive | Drain terminal of the MOSFET; the device is rated for a drain-source voltage of 20 V and a continuous drain current of 7 A at Ta=25℃. |

## 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 |  |  | 20 | V |  | 1 |
| Gate-Source Voltage | VGS | -12 |  | 12 | V |  | 1 |
| Continuous Drain Current | ID |  |  | 7 | A |  | 1 |
| Pulsed Drain Current | IDM |  |  | 25 | A | Repetitive rating; pulse width limited by junction temperature | 1 |
| Junction Temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Lead Temperature for Soldering Purposes | TL |  |  | 260 | ℃ | 1/8 in from case for 10 s | 1 |
| Thermal Resistance from Junction to Ambient | RθJA |  |  | 417 | ℃/W |  | 1 |
| Drain-source breakdown voltage | V(BR)DSS | 20 |  |  | V | VGS = 0V, ID = 250µA | 2 |
| Zero gate voltage drain current | IDSS |  |  | 1 | µA | VDS = 16V, VGS = 0V | 2 |
| Gate-body leakage current | IGSS | -10 |  | 10 | µA | VGS = ±10V, VDS = 0V | 2 |
| Gate threshold voltage | VGS(th) | 0.5 |  | 1.1 | V | VDS = VGS, ID = 250µA | 2 |
| Drain-source on-resistance | RDS(on) |  |  | 21 | mΩ | VGS = 10V, ID = 7A | 2 |
| Drain-source on-resistance | RDS(on) |  |  | 24 | mΩ | VGS = 4.5V, ID = 6.6A | 2 |
| Drain-source on-resistance | RDS(on) |  |  | 28 | mΩ | VGS = 3.8V, ID = 6A | 2 |
| Drain-source on-resistance | RDS(on) |  |  | 32 | mΩ | VGS = 2.5V, ID = 5.5A | 2 |
| Drain-source on-resistance | RDS(on) |  |  | 50 | mΩ | VGS = 1.8V, ID = 2A | 2 |
| Forward transconductance | gFS | 9 |  |  | S | VDS = 5V, ID = 7A | 2 |
| Diode forward voltage | VSD |  |  | 1 | V | IS = 1A, VGS = 0V | 2 |

## CAD (KiCad official)

- Symbol: `CJ8820`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `cj8820-etched.step` / `cj8820-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cj8820.step` / `cj8820.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/8586178591746887680) (5 pp, sha256 `774202ca9daa9db5`, retrieved 2026-10-17, 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/cj8820-datasheet.pdf)