# 2SB1188

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

2SB1188 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 | input | Base terminal of the PNP transistor; the datasheet gives no pin-specific limit, so it is bounded by the absolute maximum emitter-base voltage VEBO of -5 V. |
| 2 | COLLECTOR | passive | Collector terminal, rated for VCBO -40 V, VCEO -32 V, continuous collector current IC -2 A and collector power dissipation PC 500 mW. |
| 3 | EMITTER | passive | Emitter terminal, rated for emitter-base voltage VEBO -5 V, with the device operating up to a junction temperature TJ of 150 ℃. |

## 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-emitter saturation voltage | VCE(sat) |  |  | -0.8 | V | IC=-2A, IB=-0.2A; pulse measurement | 1 |
| DC current gain | hFE | 82 |  | 390 |  | VCE=-3V, IC=-0.5A; pulse measurement | 1 |
| Collector-base breakdown voltage | V(BR)CBO | -40 |  |  | V | IC=-50μA, IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | -32 |  |  | V | IC=-1mA, IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | -5 |  |  | V | IE=-50μA, IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | -1 | μA | VCB=-20V, IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | -1 | μA | VEB=-4V, IC=0 | 1 |
| Transition frequency | fT | 100 |  |  | MHz | VCE=-5V, IC=-0.5A, f=30MHz | 1 |
| Output capacitance | Cob |  |  | 50 | pF | VCB=-10V, IE=0, f=1MHz | 1 |
| Collector-base voltage | VCBO | -40 |  |  | V | Ta=25℃ | 1 |
| Collector-emitter voltage | VCEO | -32 |  |  | V | Ta=25℃ | 1 |
| Emitter-base voltage | VEBO | -5 |  |  | V | Ta=25℃ | 1 |
| Collector current (continuous) | 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 |

## CAD (KiCad official)

- Symbol: `2SB1188`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files: `2sb1188-etched.step` / `2sb1188-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sb1188.step` / `2sb1188.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/8586174173551210496) (2 pp, sha256 `4ad68746daa31e6e`, 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/2sb1188-datasheet.pdf)