# 2SB1260

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

2SB1260 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 emitter-base breakdown voltage is -5 V minimum (VEBO -5 V maximum rating). |
| 2 | COLLECTOR | passive | Collector terminal; rated for VCBO -80 V, VCEO -80 V, collector current IC -1 A and collector power dissipation PC 500 mW. |
| 3 | EMITTER | passive | Emitter terminal of the PNP transistor; the emitter-base breakdown voltage is -5 V minimum (VEBO -5 V maximum rating). |

## 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 | -80 |  |  | V | IC=-50µA,IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | -80 |  |  | 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=-60V,IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | -1 | µA | VEB=-4V,IC=0 | 1 |
| DC current gain | hFE | 82 |  | 390 |  | VCE=-3V, IC=-0.1A | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.4 | V | IC=-500mA,IB=-50mA | 1 |
| Collector output capacitance | Cob |  |  | 25 | pF | VCB=-10V,IE=0, f=1MHz | 1 |
| Transition frequency | fT | 100 |  |  | MHz | VCE=-5V,IC=-50mA, f=30MHz | 1 |
| Collector-Base Voltage | VCBO |  |  | -80 | V |  | 1 |
| Collector-Emitter Voltage | VCEO |  |  | -80 | V |  | 1 |
| Emitter-Base Voltage | VEBO |  |  | -5 | V |  | 1 |
| Collector Current | IC |  |  | -1 | A |  | 1 |
| Collector Power Dissipation | PC |  |  | 500 | mW |  | 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: `2SB1260`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files: `2sb1260-etched.step` / `2sb1260-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sb1260.step` / `2sb1260.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/8586174627010269184) (1 pp, sha256 `f6c6ec0f88827828`, retrieved 2026-10-17, 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/2sb1260-datasheet.pdf)