# 2SC3650

**Changjing** · Bipolar Transistors - BJT · SOT-89-3L

2SC3650 from Changjing, in a SOT-89-3L. 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 | BASE | input | Base terminal of the NPN transistor, with emitter-base breakdown voltage V(BR)EBO of 15 V minimum and absolute maximum emitter-base voltage VEBO of 15 V. |
| 2 | COLLECTOR | passive | Collector terminal of the NPN transistor, rated for VCBO of 30 V, VCEO of 25 V and collector current IC of 1.2 A. |
| 3 | EMITTER | passive | Emitter terminal of the NPN transistor, referenced in the datasheet's emitter-base rating VEBO of 15 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-89-3L |
| Category | Triode/MOS Tube/Transistor |
| 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 |
|---|---|---|---|---|---|---|---|
| Collector-base breakdown voltage | V(BR)CBO | 30 |  |  | V | IC=10µA,IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | 25 |  |  | V | IC=1mA,IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | 15 |  |  | V | IE=10µA,IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | 0.1 | µA | VCB=20V,IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | 0.1 | µA | VEB=10V,IC=0 | 1 |
| DC current gain | hFE(1) | 800 |  | 3200 |  | VCE=5V, IC=500mA | 1 |
| DC current gain | hFE(2) | 600 |  |  |  | VCE=5V, IC=10mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.5 | V | IC=500mA,IB=10mA | 1 |
| Base-emitter saturation voltage | VBE(sat) |  |  | 1.2 | V | IC=500mA,IB=10mA | 1 |
| Transition frequency | fT | 150 |  |  | MHz | VCE=10V,IC=50mA | 1 |
| Collector output capacitance | Cob |  |  | 17 | pF | VCB=10V, IE=0, f=1MHz | 1 |
| Collector-Base Voltage | VCBO |  |  | 30 | V |  | 1 |
| Collector-Emitter Voltage | VCEO |  |  | 25 | V |  | 1 |
| Emitter-Base Voltage | VEBO |  |  | 15 | V |  | 1 |
| Collector Current | IC |  |  | 1.2 | A |  | 1 |
| Collector Power Dissipation | PC |  |  | 500 | mW |  | 1 |
| Thermal Resistance From Junction To Ambient | RθJA |  |  | 250 | ℃/W |  | 1 |
| Operation Junction and Storage Temperature Range | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `2SC3650`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files: `2sc3650-etched.step` / `2sc3650-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sc3650.step` / `2sc3650.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/2sc3650-datasheet.pdf) (4 pp, sha256 `1b69e0a6f9c1e11b`, retrieved 2026-10-28, 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/2sc3650-datasheet.pdf)