# B772Y-2AF

**FOSAN** · Bipolar (BJT) · SOT-89-3L

B772Y-2AF from FOSAN, 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 | B | input | Base of the PNP transistor; VEBO max -6 V and BVEBO min -6 V (IE=-100µA). |
| 2 | C | passive | Collector of the PNP transistor (also connected to the exposed tab); VCBO -40 V, VCEO -30 V, IC max -3000 mA. |
| 3 | E | passive | Emitter of the PNP transistor; power dissipation 500 mW at Ta=25℃, junction temperature -55 to +150℃. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | FOSAN |
| 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 | BVCBO | -40 |  |  | V | IC= -100µA, IE=0 | 2 |
| Collector-Emitter Breakdown Voltage | BVCEO | -30 |  |  | V | IC= -10mA, IB=0 | 2 |
| Emitter-Base Breakdown Voltage | BVEBO | -6 |  |  | V | IE= -100µA, IC=0 | 2 |
| Collector-Base Leakage Current | ICBO |  |  | -1 | µA | VCB= -40V, IE=0 | 2 |
| Collector-Emitter Leakage Current | ICEO |  |  | -10 | µA | VCE= -30V, IB=0 | 2 |
| Emitter-Base Leakage Current | IEBO |  |  | -1 | µA | VEB= -6V, IC=0 | 2 |
| DC Current Gain | HFE | 60 |  | 400 |  | VCE= -2V, IC= -1000mA | 2 |
| DC Current Gain, Y grade (device marking) | HFE | 160 |  | 320 |  | Y grade per device marking table | 1 |
| Collector-Emitter Saturation Voltage | VCE(sat) |  |  | -0.5 | V | IC= -2A, IB= -0.2A | 2 |
| Base-Emitter Saturation Voltage | VBE(sat) |  |  | -1.5 | V | IC= -2A, IB= -0.2A | 2 |
| Collector-Base Voltage | VCBO | -40 |  |  | V |  | 1 |
| Collector-Emitter Voltage | VCEO | -30 |  |  | V |  | 1 |
| Emitter-Base Voltage | VEBO | -6 |  |  | V |  | 1 |
| Collector Current | IC | -3000 |  |  | mA |  | 1 |
| Power dissipation | PC |  |  | 500 | mW | Ta=25℃ | 1 |
| Junction and Storage Temperature | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance Junction-Ambient | RΘJA |  |  | 250 | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `B772Y-2AF`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files: `b772y-2af-etched.step` / `b772y-2af-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `b772y-2af.step` / `b772y-2af.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [FOSAN datasheet](docs/b772y-2af-datasheet.pdf) (4 pp, sha256 `5667d1bb23727ff4`, retrieved 2026-10-21, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/b772y-2af-datasheet.pdf)