# BC846AQ

**Yangzhou Yangjie Elec Tech** · Bipolar (BJT) · SOT-23

BC846AQ from Yangzhou Yangjie Elec Tech, 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 | B | input | Base of the NPN transistor; drives the device, with VEBO limited to 6 V and VBE(sat) max 1.1 V at IC=100mA, IB=5mA. |
| 2 | E | passive | Emitter of the NPN transistor; emitter-base breakdown V(BR)EBO min 6 V at IE=10μA. |
| 3 | C | passive | Collector of the NPN transistor; BC846AQ VCBO 80 V, VCEO 65 V, continuous IC 0.1 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| 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 Voltage | VCBO |  |  | 80 | V | BC846AQ | 1 |
| Collector-Emitter Voltage | VCEO |  |  | 65 | V | BC846AQ | 1 |
| Emitter-Base Voltage | VEBO |  |  | 6 | V |  | 1 |
| Collector Current -Continuous | IC |  |  | 0.1 | A |  | 1 |
| Total Device Dissipation | PD |  |  | 300 | mW | Device mounted on FR-4 PCB 1.0 x 1.0 x 0.06 inch | 1 |
| Thermal Resistance Junction to Ambient | RthJA |  |  | 417 | K/W | Device mounted on FR-4 PCB 1.0 x 1.0 x 0.06 inch | 1 |
| Junction Temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Collector-base breakdown voltage | V(BR)CBO | 80 |  |  | V | IC=10μA,IE=0 | 2 |
| Collector-emitter breakdown voltage | V(BR)CEO | 65 |  |  | V | IC=10mA,IB=0 | 2 |
| Emitter-base breakdown voltage | V(BR)EBO | 6 |  |  | V | IE=10μA,IC=0 | 2 |
| Collector cut-off current | ICBO |  |  | 100 | nA | VCB=70V, IE=0 | 2 |
| Emitter cut-off current | IEBO |  |  | 100 | nA | VEB=5V, IC=0 | 2 |
| DC current gain | hFE | 110 |  | 220 |  | VCE=5.0V, IC=2mA | 2 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.5 | V | IC=100mA, IB=5mA | 2 |
| Base-emitter saturation voltage | VBE(sat) |  |  | 1.1 | V | IC=100mA, IB=5mA | 2 |
| Transition frequency | fT | 150 |  |  | MHz | VCE=5Vdc, IC=10mA, f=30MHz | 2 |
| Collector output capacitance | Cob |  |  | 4.5 | pF | VCB=10V, f=1MHz | 2 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing |  | black | 4. Body color: Black | 5 |
| contacts |  | tin | ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |

## CAD (KiCad official)

- Symbol: `BC846AQ`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bc846aq-etched.step` / `bc846aq-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bc846aq.step` / `bc846aq.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603581498943684608) (6 pp, sha256 `fceb9f09af12ffee`, retrieved 2026-10-18, tier: lcsc)
- **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/bc846aq-datasheet.pdf)