# MJD3055

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

MJD3055 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 | NPN transistor base terminal; the datasheet gives no separate base-current rating, and the emitter-base voltage limit VEBO is 5 V. |
| 2 | COLLECTOR | passive | NPN transistor collector terminal; maximum ratings are VCBO 70 V, VCEO 60 V, continuous IC 10 A, and PC 1.25 W at Ta=25℃. |
| 3 | EMITTER | passive | NPN transistor emitter terminal; the datasheet lists the emitter-base voltage rating VEBO as 5 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-252-2L |
| 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 | 70 |  |  | V | Ic=1mA,IE=0 | 2 |
| Collector-emitter breakdown voltage | V(BR)CEO | 60 |  |  | V | Ic=200 mA,IB=0 | 2 |
| Emitter-base breakdown voltage | V(BR)EBO | 5 |  |  | V | IE=1mA,IC=0 | 2 |
| Collector cut-off current | ICBO |  |  | 0.02 | mA | VCB=70V,IE=0 | 2 |
| Collector cut-off current | ICEO |  |  | 50 | µA | VCB=30V,IB=0 | 2 |
| Emitter cut-off current | IEBO |  |  | 0.5 | mA | VEB=5V,IC=0 | 2 |
| DC current gain | hFE(1) | 20 |  | 100 |  | VCE=4V,IC=4A | 2 |
| DC current gain | hFE(2) | 5 |  |  |  | VCE=4V,IC=10A | 2 |
| Collector-emitter saturation voltage | VCE(sat)(1) |  |  | 1.1 | V | IC=4A, IB=0.4A | 2 |
| Collector-emitter saturation voltage | VCE(sat)(2) |  |  | 8 | V | IC=10A, IB=3.3A | 2 |
| Base-emitter voltage | VBE |  |  | 1.8 | V | VCE=4V, IC=4A | 2 |
| Transition frequency | fT | 2 |  |  | MHz | VCE=10V,IC=0.5A,f=500KHZ | 2 |
| Collector-Base Voltage | VCBO |  |  | 70 | V | Ta=25℃ | 1 |
| Collector-Emitter Voltage | VCEO |  |  | 60 | V | Ta=25℃ | 1 |
| Emitter-Base Voltage | VEBO |  |  | 5 | V | Ta=25℃ | 1 |
| Collector Current - Continuous | IC |  |  | 10 | A | Ta=25℃ | 1 |
| Collector Power Dissipation | PC |  |  | 1.25 | W | Ta=25℃ | 1 |
| Operating Junction and Storage Temperature Range | TJ,Tstg | -55 |  | 150 | ℃ | Ta=25℃ | 1 |

## CAD (KiCad official)

- Symbol: `MJD3055`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252-2L (KiCad packages3D, STEP)
- 3D model files: `mjd3055-etched.step` / `mjd3055-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mjd3055.step` / `mjd3055.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/8588947718966689792) (5 pp, sha256 `f370998934b8645c`, retrieved 2026-10-18, 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/mjd3055-datasheet.pdf)