# C1815

**Changjing** · Bipolar (BJT) · SOT-23

C1815 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 | BASE | passive | Base terminal of the NPN transistor; the datasheet gives no pin-specific limit, and the device-level maximum ratings are VCBO 60 V, VCEO 50 V, VEBO 5 V, IC 150 mA continuous and PC 200 mW. |
| 2 | EMITTER | passive | Emitter terminal of the NPN transistor; the datasheet gives no pin-specific limit, and the emitter-base reverse limit is VEBO 5 V. |
| 3 | COLLECTOR | passive | Collector terminal of the NPN transistor; the datasheet gives no pin-specific limit, and the collector ratings are VCBO 60 V, VCEO 50 V and IC 150 mA continuous. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `C1815`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `c1815-etched.step` / `c1815-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `c1815.step` / `c1815.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/8586172868577677312) (2 pp, sha256 `a5d431e7552a94fa`, 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/c1815-datasheet.pdf)