# KMBT3906

**KEXIN** · Bipolar (BJT) · SOT-23

KMBT3906 from KEXIN, 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 | Base | input | Base terminal of this PNP transistor; the datasheet gives the emitter-base breakdown limit VEBO as -5 V and the absolute maximum emitter-base voltage as -5 V. |
| 2 | Emitter | passive | Emitter terminal of this PNP transistor; the emitter-base breakdown voltage VEBO is -5 V minimum at IE = -100 µA with IC = 0. |
| 3 | Collector | passive | Collector terminal of this PNP transistor; rated at VCBO -40 V, VCEO -40 V, and continuous collector current IC -0.2 A, with collector dissipation PC of 0.3 W. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KEXIN |
| 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 |  |  | -40 | V |  | 1 |
| Collector-Emitter Voltage | VCEO |  |  | -40 | V |  | 1 |
| Emitter-Base Voltage | VEBO |  |  | -5 | V |  | 1 |
| Collector Current-Continuous | IC |  |  | -0.2 | A |  | 1 |
| Collector Dissipation | PC |  |  | 0.3 | W |  | 1 |
| Junction and Storage Temperature | TJ, Tstg | -55 |  | 150 |  |  | 1 |
| Collector-base breakdown voltage | VCBO | -40 |  |  | V | Ic= -100 ìA IE=0 | 1 |
| Collector-emitter breakdown voltage | VCEO | -40 |  |  | V | Ic= -1 mA IB=0 | 1 |
| Emitter-base breakdown voltage | VEBO | -5 |  |  | V | IE= -100 ìA IC=0 | 1 |
| Collector cut-off current | IcBO |  |  | -0.1 | A | VCB= -40 V , IE=0 | 1 |
| Collector cut-off current | IcEO |  |  | -50 | nA | VCE= -40 V , VBE(off)=-3V | 1 |
| Emitter cut-off current | IEBO |  |  | -0.1 | A | VEB= -5V , IC=0 | 1 |
| DC current gain | hFE | 100 |  | 300 |  | VCE= -1V, IC= -10mA | 1 |
| DC current gain | hFE | 60 |  |  |  | VCE= -1V, IC= -50mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.3 | V | IC=-50 mA, IB= -5mA | 1 |
| Base-emitter saturation voltage | VBE(sat) |  |  | -0.95 | V | IC=-50 mA, IB= -5mA | 1 |
| Transition frequency | fT | 250 |  |  | MHz | VCE= -20V, IC= -10mA, f=100MHz | 1 |

## CAD (KiCad official)

- Symbol: `KMBT3906`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `kmbt3906-etched.step` / `kmbt3906-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `kmbt3906.step` / `kmbt3906.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KEXIN datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588884505499750400) (2 pp, sha256 `aff64c096620bd0b`, retrieved 2026-10-19, 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/kmbt3906-datasheet.pdf)