# 2SC2873U

**CBI** · Bipolar (BJT) · SOT-89

2SC2873U from CBI, in a SOT-89. 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 | B | input | Base; emitter-base breakdown voltage V(BR)EBO is 5 V min and absolute maximum VEBO is 5 V. |
| 2 | C | passive | Collector (also the tab); VCEO is 50 V, VCBO is 50 V, and collector current IC is 2 A maximum. |
| 3 | E | passive | Emitter; main current return terminal of the NPN transistor, with total power dissipation PC of 500 mW. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| Package | SOT-89 |
| 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 | 50 |  |  | V | IC=100µA,IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | 50 |  |  | V | IC=1mA,IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | 5 |  |  | V | IE=100µA,IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | 0.1 | µA | VCB=50V,IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | 0.1 | µA | VEB=5V,IC=0 | 1 |
| DC current gain | hFE(1) | 70 |  | 240 |  | VCE=2V, IC=0.5A | 1 |
| DC current gain | hFE(2) | 20 |  |  |  | VCE=2V, IC=2A | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.5 | V | IC=1A,IB=50mA | 1 |
| Base-emitter saturation voltage | VBE(sat) |  |  | 1.2 | V | IC=1A,IB=50mA | 1 |
| Transition frequency | fT | 120 |  |  | MHz | VCE=2V,IC=0.5A | 1 |
| Collector output capacitance | Cob |  |  | 30 | pF | VCB=10V, IE=0, f=1MHz | 1 |
| Collector-Base Voltage | VCBO |  |  | 50 | V | Ta=25℃ | 1 |
| Collector-Emitter Voltage | VCEO |  |  | 50 | V | Ta=25℃ | 1 |
| Emitter-Base Voltage | VEBO |  |  | 5 | V | Ta=25℃ | 1 |
| Collector Current | IC |  |  | 2 | A | Ta=25℃ | 1 |
| Collector Power Dissipation | PC |  |  | 500 | mW | Ta=25℃ | 1 |
| Junction Temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance From Junction To Ambient | RθJA |  |  | 250 | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `2SC2873U`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `2sc2873u-etched.step` / `2sc2873u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sc2873u.step` / `2sc2873u.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [CBI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590907834383085568) (3 pp, sha256 `cbefd354fccb3e90`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/2sc2873u-datasheet.pdf)