# 2SB1188-R

**ALJ** · Bipolar (BJT) · SOT-89

2SB1188-R from ALJ, 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 | Base | passive | Base terminal of the PNP transistor; emitter-base breakdown voltage V(BR)EBO is -5 V minimum at IE = -50µA, and VEBO is rated -5 V. |
| 2 | Collector | passive | Collector terminal; rated for a collector-base voltage VCBO of -40 V, a collector-emitter voltage VCEO of -32 V, and a collector current IC of -2 A, with 500 mW collector power dissipation. |
| 3 | Emitter | passive | Emitter terminal; the emitter-base voltage rating VEBO is -5 V and the emitter cut-off current IEBO is limited to -1 µA at VEB = -4 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ALJ |
| 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 | -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 |
| DC current gain | hFE(2) | 180 |  | 390 |  | VCE = -3V, IC = -500mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.8 | V | IC = -2A, IB = -0.2A | 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 |  | 1 |
| Collector-emitter voltage | VCEO |  |  | -32 | V |  | 1 |
| Emitter-base voltage | VEBO |  |  | -5 | V |  | 1 |
| Collector current | IC |  |  | -2 | A |  | 1 |
| Collector power dissipation | PC |  |  | 500 | mW |  | 1 |
| Junction temperature | Tj |  |  | 150 | °C |  | 1 |
| Storage temperature | Tstg | -55 |  | 150 | °C |  | 1 |
| Thermal resistance, junction to ambient | RθJA |  |  | 250 | °C/W |  | 1 |

## CAD (KiCad official)

- Symbol: `2SB1188-R`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `2sb1188-r-etched.step` / `2sb1188-r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sb1188-r.step` / `2sb1188-r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ALJ datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603369166246060032) (2 pp, sha256 `d323a4ae52529b07`, retrieved 2026-10-19, 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-r-datasheet.pdf)