# BCV27T

**CBI** · Bipolar (BJT) · SOT-523

BCV27T from CBI, in a SOT-523. 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 of the NPN Darlington transistor; emitter-base voltage is limited to 10 V (VEBO) and emitter-base breakdown is 10 V min at IE=10µA. |
| 2 | EMITTER | passive | Emitter of the NPN Darlington transistor; collector current is rated to 500 mA maximum. |
| 3 | COLLECTOR | passive | Collector of the NPN Darlington transistor; rated 40 V collector-base (VCBO), 30 V collector-emitter (VCEO), 500 mA continuous and 300 mW dissipation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| Package | SOT-523 |
| 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 |  |  | 40 | V |  | 1 |
| Collector-Emitter Voltage | VCEO |  |  | 30 | V |  | 1 |
| Emitter-Base Voltage | VEBO |  |  | 10 | V |  | 1 |
| Collector Current | IC |  |  | 500 | mA |  | 1 |
| Collector Power Dissipation | PC |  |  | 300 | mW |  | 1 |
| Operation Junction and Storage Temperature Range | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |
| Collector-base breakdown voltage | V(BR)CBO | 40 |  |  | V | IC=100µA, IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | 30 |  |  | V | IC=10mA, IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | 10 |  |  | V | IE=10µA, IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | 0.1 | µA | VCB=30V, IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | 0.1 | µA | VEB=10V, IC=0 | 1 |
| DC current gain hFE(1) | hFE(1) | 4000 |  |  |  | VCE=1V, IC=1mA | 1 |
| DC current gain hFE(2) | hFE(2) | 10000 |  |  |  | VCE=5V, IC=10mA | 1 |
| DC current gain hFE(3) | hFE(3) | 20000 |  |  |  | VCE=5V, IC=100mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 1 | V | IC=100mA, IB=0.1mA | 1 |
| Base-emitter saturation voltage | VBE(sat) |  |  | 1.5 | V | IC=100mA, IB=0.1mA | 1 |
| Collector output capacitance | Cob |  |  | 3.5 | pF | VCB=10V, IE=0, f=1MHz | 1 |
| Transition frequency | fT |  | 170 |  | MHz | VCE=5V,IC=50mA, f=100MHz | 1 |
| Thermal Resistance From Junction To Ambient | RΘJA |  | 416 |  | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `BCV27T`
- Footprint: `Package_TO_SOT_SMD:SOT-523`
- 3D model: SOT-523, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.8 mm nominal SOT-523 height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `bcv27t-etched.step` / `bcv27t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bcv27t.step` / `bcv27t.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [CBI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590921052887601152) (3 pp, sha256 `951524dc38cb40cd`, retrieved 2026-10-17, 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/bcv27t-datasheet.pdf)