# 2SC554

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

2SC554 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 | passive | Base terminal of the NPN transistor, with emitter-base breakdown V(BR)EBO of 6 V minimum and VEBO rated at 6 V. |
| 2 | COLLECTOR | passive | Collector terminal, rated for VCBO and VCEO of 100 V, collector current IC of 2 A, and collector power dissipation PC of 500 mW. |
| 3 | EMITTER | passive | Emitter terminal, the reference for base and collector, with emitter-base rating VEBO of 6 V. |

## 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 | 100 |  |  | V | IC=0.1mA, IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | 100 |  |  | V | IC=1mA, IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | 6 |  |  | V | IE=0.1mA, IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | 1 | µA | VCB=100V, IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | 1 | µA | VEB=4V, IC=0 | 1 |
| DC current gain | hFE | 82 |  | 270 |  | VCE=3V, IC=100mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.2 | V | IC=500mA, IB=25mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.3 | V | IC=1A, IB=50mA | 1 |
| Transition frequency | fT | 30 |  |  | MHz | VCE=5V, IC=100mA | 1 |
| Collector output capacitance | Cob |  | 16 |  | pF | VCB=10V, IE=0, f=1MHz | 1 |
| Collector-Base Voltage | VCBO |  |  | 100 | V | Ta=25℃ unless otherwise noted | 1 |
| Collector-Emitter Voltage | VCEO |  |  | 100 | V | Ta=25℃ unless otherwise noted | 1 |
| Emitter-Base Voltage | VEBO |  |  | 6 | V | Ta=25℃ unless otherwise noted | 1 |
| Collector Current | IC |  |  | 2 | A | Ta=25℃ unless otherwise noted | 1 |
| Collector Power Dissipation | PC |  |  | 500 | mW | Ta=25℃ unless otherwise noted | 1 |
| Operation Junction and Storage Temperature Range | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance From Junction To Ambient | RθJA |  |  | 250 | ℃/W | Ta=25℃ unless otherwise noted | 1 |

## CAD (KiCad official)

- Symbol: `2SC554`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files: `2sc554-etched.step` / `2sc554-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sc554.step` / `2sc554.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/8602938749668519936) (4 pp, sha256 `e93797551eb90486`, 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/2sc554-datasheet.pdf)