# 2N5401U

**CBI** · Bipolar (BJT) · SOT-89

2N5401U from CBI, in a SOT-89. 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 PNP transistor; VEBO max -5 V, IEBO max -50 nA at VEB=-3 V. |
| 2 | Collector | passive | Collector of the PNP transistor (also the SOT-89 tab); VCBO -160 V, VCEO -150 V, IC continuous -0.5 A. |
| 3 | Emitter | passive | Emitter of the PNP transistor; total power dissipation 0.5 W, junction temperature 150 °C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| Package | SOT-89 |
| 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 | V(BR)CBO | -160 |  |  | V | IC= -100μA, IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | -150 |  |  | V | IC = -1mA, IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | -5 |  |  | V | IE = -10μA, IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | -50 | nA | VCB = -120 V, IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | -50 | nA | VEB= -3V, IC=0 | 1 |
| DC current gain hFE(1) | hFE(1) | 50 |  |  |  | VCE= -5V, IC=-1 mA | 1 |
| DC current gain hFE(2) | hFE(2) | 60 |  | 300 |  | VCE= -5V, IC= -10 mA | 1 |
| DC current gain hFE(3) | hFE(3) | 50 |  |  |  | VCE= -5V, IC=-50 mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.2 | V | IC= -10 mA, IB= -1 mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.5 | V | IC= -50 mA, IB= -5 mA | 1 |
| Base-emitter saturation voltage | VBE(sat) |  |  | -1 | V | IC= -10 mA, IB= -1 mA | 1 |
| Transition frequency | fT | 100 |  | 300 | MHz | VCE= -10V, IC= -10mA, f = 100MHz | 1 |
| Output capacitance | Cob |  |  | 6 | pF | VCB=-10V, IE= 0,f=1MHz | 1 |
| Noise figure | NF |  |  | 8 | dB | VCE= -5.0V, IC= -200μA, RS= 10Ω,f =10Hz to15.7kHz | 1 |
| Collector-emitter voltage | VCEO |  |  | -150 | V |  | 1 |
| Collector-base voltage | VCBO |  |  | -160 | V |  | 1 |
| Emitter-base voltage | VEBO |  |  | -5 | V |  | 1 |
| Collector current, continuous | IC |  |  | -0.5 | A |  | 1 |
| Collector power dissipation | PC |  |  | 0.5 | W |  | 1 |
| Junction temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal resistance, junction to ambient | RθJA |  |  | 250 | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `2N5401U`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `2n5401u-etched.step` / `2n5401u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2n5401u.step` / `2n5401u.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/8588954458659164160) (3 pp, sha256 `0128aa494cb2f02b`, retrieved 2026-10-09, 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/2n5401u-datasheet.pdf)