# 2SB776

**Changjing** · Bipolar Transistors - BJT · TO-126

2SB776 from Changjing, in a TO-126. 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 | EMITTER | passive | Emitter of the PNP transistor; the datasheet gives no emitter-specific limit, and the emitter-base voltage VEBO is -5 V with collector current IC -3 A continuous. |
| 2 | COLLECTOR | passive | Collector of the PNP transistor; the maximum ratings give VCBO -50 V, VCEO -50 V and collector current IC -3 A continuous. |
| 3 | BASE | passive | Base of the PNP transistor; the datasheet gives no base-specific limit, and saturation is tested at IC -2 A with IB -200 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-126 |
| Category | Triode/MOS Tube/Transistor |
| 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 Voltage | VCBO |  |  | -50 | V |  | 1 |
| Collector-Emitter Voltage | VCEO |  |  | -50 | V |  | 1 |
| Emitter-Base Voltage | VEBO |  |  | -5 | V |  | 1 |
| Collector Current Continuous | IC |  |  | -3 | A |  | 1 |
| Collector Power Dissipation | PC |  |  | 1 | W |  | 1 |
| Operation Junction and Storage Temperature Range | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |
| Collector-base breakdown voltage | V(BR)CBO | -50 |  |  | V | IC=-100µA,IE=0 | 2 |
| Collector-emitter breakdown voltage | V(BR)CEO | -50 |  |  | V | IC=-5mA,IB=0 | 2 |
| Emitter-base breakdown voltage | V(BR)EBO | -5 |  |  | V | IE=-100µA,IC=0 | 2 |
| Collector cut-off current | ICBO |  |  | -1 | µA | VCB=-50V,IE=0 | 2 |
| Emitter cut-off current | IEBO |  |  | -1 | µA | VEB=-3V,IC=0 | 2 |
| DC current gain hFE(1) | hFE(1) | 100 |  |  |  | VCE=-2V,IC=-20mA | 2 |
| DC current gain hFE(2) | hFE(2) | 100 |  | 400 |  | VCE=-2V,IC=-1A | 2 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.5 | V | IC=-2A,IB=-200mA | 2 |
| Base-emitter saturation voltage | VBE(sat) |  |  | -2 | V | IC=-2A,IB=-200mA | 2 |
| Transition frequency | fT | 80 |  |  | MHz | VCE=-5V,IC=-100mA | 2 |
| Collector output capacitance | Cob |  |  | 45 | pF | VCB=-10V,IE=0,f=1MHz | 2 |

## CAD (KiCad official)

- Symbol: `2SB776`
- Footprint: `Package_TO_SOT_THT:TO-126-3_Vertical`
- 3D model: TO-126 (KiCad packages3D, STEP)
- 3D model files: `2sb776-etched.step` / `2sb776-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sb776.step` / `2sb776.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/2sb776-datasheet.pdf) (3 pp, sha256 `87c01f0d45602954`, retrieved 2026-10-27, 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/2sb776-datasheet.pdf)