# 2SB1198

**Changjing** · Bipolar (BJT) · SOT-23

2SB1198 from Changjing, in a SOT-23. 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 emitter-base breakdown voltage V(BR)EBO of -5 V (IE=-50μA, IC=0). |
| 2 | EMITTER | passive | Emitter terminal of the PNP transistor; absolute maximum emitter-base voltage VEBO is -5 V and continuous collector current IC is -500 mA. |
| 3 | COLLECTOR | passive | Collector terminal of the PNP transistor; absolute maximum ratings are VCBO -80 V, VCEO -80 V, IC -500 mA continuous, and collector power dissipation PC 200 mW. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-23 |
| 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 | -80 |  |  | V | IC=-50μA, IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | -80 |  |  | V | IC=-2mA, IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | -5 |  |  | V | IE=-50μA, IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | -0.5 | μA | VCB=-50V, IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | -0.5 | μA | VEB=-4V, IC=0 | 1 |
| DC current gain | hFE(1) | 120 |  | 390 |  | VCE=-3V, IC=-100mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.5 | V | IC=-500mA, IB=-50mA | 1 |
| Transition frequency | fT | 180 |  |  | MHz | VCE=-10V, IC=-50mA, f=100MHz | 1 |
| Collector output capacitance | Cob |  |  | 11 | pF | VCB=-10V, IE=0, f=1MHz | 1 |
| Collector-base voltage | VCBO |  |  | -80 | V |  | 1 |
| Collector-emitter voltage | VCEO |  |  | -80 | V |  | 1 |
| Emitter-base voltage | VEBO |  |  | -5 | V |  | 1 |
| Collector current, continuous | IC |  |  | -500 | mA |  | 1 |
| Collector power dissipation | PC |  |  | 200 | mW |  | 1 |
| Operation junction and storage temperature range | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `2SB1198`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `2sb1198-etched.step` / `2sb1198-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sb1198.step` / `2sb1198.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/8588947369895739392) (4 pp, sha256 `03d00aa344da3b5b`, retrieved 2026-10-16, 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/2sb1198-datasheet.pdf)