# 2SC4115

**Changjing** · Bipolar (BJT) · SOT-89-3L

2SC4115 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, driven with IB = 0.1 A in the datasheet's VCE(sat) test condition (IC = 2 A), and the emitter-base breakdown is rated at 6 V (VEBO). |
| 2 | COLLECTOR | passive | Collector terminal, rated for VCBO 40 V, VCEO 20 V, continuous IC 3 A, and collector power dissipation PC 500 mW. |
| 3 | EMITTER | passive | Emitter terminal, the reference for the 6 V emitter-base breakdown rating (V(BR)EBO) and the 5 V VEB test condition for ICBO/IEBO. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-89-3L |
| 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 |
|---|---|---|---|---|---|---|---|
| Collector-base breakdown voltage | V(BR)CBO | 40 |  |  | V | IC= 50μA, IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | 20 |  |  | V | IC=1mA, IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | 6 |  |  | V | IE=50μA, IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | 0.1 | μA | VCB=30V, IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | 0.1 | μA | VEB=5V, IC=0 | 1 |
| DC current gain | hFE | 120 |  | 560 |  | VCE=2V, IC=0.1A | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.5 | V | IC=2A, IB=0.1A; pulse test | 1 |
| Transition frequency | fT | 200 | 290 |  | MHz | VCE=2V, IC=0.5A, F=100MHz | 1 |
| Collector-Base Voltage | VCBO |  |  | 40 | V |  | 1 |
| Collector-Emitter Voltage | VCEO |  |  | 20 | V |  | 1 |
| Emitter-Base Voltage | VEBO |  |  | 6 | V |  | 1 |
| Collector Current -Continuous | IC |  |  | 3 | A |  | 1 |
| Collector Power Dissipation | PC |  |  | 500 | mW |  | 1 |
| Junction Temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `2SC4115`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files: `2sc4115-etched.step` / `2sc4115-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sc4115.step` / `2sc4115.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/8586174110599172096) (1 pp, sha256 `030e99506536a274`, retrieved 2026-10-19, 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/2sc4115-datasheet.pdf)