# 2SD1782

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

2SD1782 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 2SD1782 NPN transistor; the datasheet rates emitter-base voltage VEBO at 5 V. |
| 2 | EMITTER | passive | Emitter terminal of the 2SD1782 NPN transistor; the datasheet rates emitter-base voltage VEBO at 5 V. |
| 3 | COLLECTOR | passive | Collector terminal of the 2SD1782 NPN transistor; the datasheet rates collector-base voltage VCBO at 80 V and continuous collector current IC at 500 mA. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `2SD1782`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `2sd1782-etched.step` / `2sd1782-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sd1782.step` / `2sd1782.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/8588947794967072768) (3 pp, sha256 `f114528e618ee6f5`, 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/2sd1782-datasheet.pdf)