# BC3401

**CBI** · MOSFETs · SOT-23

BC3401 from CBI, 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 | GATE | input | Gate terminal of the P-channel MOSFET; the datasheet rates gate-source voltage at ±12 V (VGS). |
| 2 | SOURCE | passive | Source terminal of the P-channel MOSFET; the datasheet rates the maximum body-diode continuous current at -2.2 A (IS). |
| 3 | DRAIN | passive | Drain terminal of the P-channel MOSFET; the datasheet rates drain-source voltage at -30 V (VDS) and continuous drain current at -4.2 A at TA=25°C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| 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 |
|---|---|---|---|---|---|---|---|
| Drain-Source Voltage | VDS |  |  | -30 | V |  | 1 |
| Gate-Source Voltage | VGS | -12 |  | 12 | V |  | 1 |
| Continuous Drain Current | ID |  |  | -4.2 | A | TA=25°C | 1 |
| Continuous Drain Current | ID |  |  | -3.5 | A | TA=70°C | 1 |
| Pulsed Drain Current | IDM |  |  | -30 | A | Note B: repetitive, pulse width limited by junction temperature | 1 |
| Power Dissipation | PD |  |  | 1.4 | W | TA=25°C | 1 |
| Power Dissipation | PD |  |  | 1 | W | TA=70°C | 1 |
| Junction and Storage Temperature Range | TJ, TSTG | -55 |  | 150 | °C |  | 1 |
| Maximum Junction-to-Ambient | RθJA |  | 65 | 90 | °C/W | t ≤ 10s | 1 |
| Maximum Junction-to-Ambient | RθJA |  | 85 | 125 | °C/W | Steady-State | 1 |
| Maximum Junction-to-Lead | RθJL |  | 43 | 60 | °C/W | Steady-State | 1 |
| Drain-Source Breakdown Voltage | BVDSS | -30 |  |  | V | ID=-250µA, VGS=0V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -1 | µA | VDS=-24V, VGS=0V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -5 | µA | VDS=-24V, VGS=0V, TJ=55°C | 2 |
| Gate-Body Leakage Current | IGSS | -100 |  | 100 | nA | VDS=0V, VGS=±12V | 2 |
| Gate Threshold Voltage | VGS(th) | -0.7 | -1 | -1.3 | V | VDS=VGS, ID=-250µA | 2 |
| On State Drain Current | ID(ON) | -25 |  |  | A | VGS=-4.5V, VDS=-5V | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 42 | 50 | mΩ | VGS=-10V, ID=-4.2A | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  |  | 75 | mΩ | TJ=125°C | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 53 | 65 | mΩ | VGS=-4.5V, ID=-4A | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 80 | 120 | mΩ | VGS=-2.5V, ID=-1A | 2 |
| Diode Forward Voltage | VSD |  | -0.75 | -1 | V | IS=-1A, VGS=0V | 2 |
| Maximum Body-Diode Continuous Current | IS |  |  | -2.2 | A |  | 2 |

## CAD (KiCad official)

- Symbol: `BC3401`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bc3401-etched.step` / `bc3401-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bc3401.step` / `bc3401.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/8603120021660971008) (5 pp, sha256 `2a382a69230262f4`, retrieved 2026-10-18, 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/bc3401-datasheet.pdf)