# FCR520B

**GUOXIN JIAPIN SEMICONDUCTOR** · Bipolar (BJT) · SOT-23

FCR520B from GUOXIN JIAPIN SEMICONDUCTOR, 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 planar NPN transistor; the datasheet gives the base-emitter reverse limit VEBO 2.5 V and the base-collector breakdown VCBO 20 V (absolute maximum ratings at TA=25°C). |
| 2 | E | passive | Emitter of the planar NPN transistor; the datasheet gives the absolute maximum IC of 70 mA and PC of 200 mW at TA=25°C for the device. |
| 3 | C | passive | Collector of the planar NPN transistor; the datasheet gives the collector-emitter breakdown VCEO of 12 V and the absolute maximum junction temperature Tj of 150 °C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | GUOXIN JIAPIN SEMICONDUCTOR |
| 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 (limiting conditions) | VCBO |  |  | 20 | V | TA=25℃ | 1 |
| Collector-emitter breakdown voltage (limiting conditions) | VCEO |  |  | 12 | V | TA=25℃ | 1 |
| Emitter-base breakdown voltage (limiting conditions) | VEBO |  |  | 2.5 | V | TA=25℃ | 1 |
| Collector current | IC |  |  | 70 | mA | TA=25℃ | 1 |
| Power dissipation | PC |  |  | 200 | mW | TA=25℃ | 1 |
| Junction temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage temperature | Tstg | -65 |  | 150 | ℃ |  | 1 |
| DC current gain | HFE | 90 | 150 | 250 |  | VCE=6V,IC=20mA | 2 |
| Gain-bandwidth product | fT |  | 8 |  | GHz | VCE=6V,IC=20mA,f=1GHz | 2 |
| Output feedback capacitance | Cre |  | 0.65 |  | pF | VCB=10V,IE=0mA,f=1MHz | 2 |
| Power gain | /S21e/2 |  | 12 |  | dB | VCE=6V,IC=20mA,f=0.9GHz | 2 |
| Noise figure | NF |  | 1.6 |  | dB | VCE=6V,IC=5mA,f=0.9GHz | 2 |
| Collector-base leakage current | ICBO |  | 0.1 |  | µA | VCB=10V | 2 |
| Emitter-base leakage current | IEBO |  | 0.1 |  | µA | VEB=1V | 2 |
| Collector-base breakdown voltage (electrical characteristics) | VCBO |  | 20 |  | V | IC=1.0µA | 2 |

## CAD (KiCad official)

- Symbol: `FCR520B`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `fcr520b-etched.step` / `fcr520b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fcr520b.step` / `fcr520b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [GUOXIN JIAPIN SEMICONDUCTOR datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590230300262768640) (5 pp, sha256 `bfefc2ce4b344f98`, retrieved 2026-10-18, 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-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/fcr520b-datasheet.pdf)