# MJD41C

**Changjing** · Bipolar (BJT) · TO-252-2L

MJD41C from Changjing, in a TO-252-2L. 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, which has built-in base-emitter resistors (monolithic construction); VEBO is rated 5 V. |
| 2 | COLLECTOR | passive | Collector terminal rated for VCBO 100 V, VCEO 100 V, continuous collector current IC 6 A and pulsed collector current ICP 10 A. |
| 3 | EMITTER | passive | Emitter terminal; the datasheet rates the emitter-base voltage VEBO at 5 V and the device power dissipation PC at 1.25 W. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-252-2L |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `MJD41C`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252-2L (KiCad packages3D, STEP)
- 3D model files: `mjd41c-etched.step` / `mjd41c-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mjd41c.step` / `mjd41c.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/8588944375698608128) (5 pp, sha256 `f4b1069db3404f8a`, 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/mjd41c-datasheet.pdf)