# MMBT3904K

**Shikues** · Bipolar (BJT) · SOT-23

MMBT3904K from Shikues, 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 of the NPN transistor; emitter-base voltage limited to 6 V (VEBO). |
| 2 | EMITTER | passive | Emitter of the NPN transistor. |
| 3 | COLLECTOR | passive | Collector of the NPN transistor; collector-emitter voltage limited to 40 V (VCEO) and collector-base voltage to 60 V (VCBO). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shikues |
| 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 |  |  | 60 | V |  | 1 |
| Collector-Emitter Voltage | VCEO |  |  | 40 | V |  | 1 |
| Emitter-Base Voltage | VEBO |  |  | 6 | V |  | 1 |
| Collector Power Dissipation | PC |  |  | 200 | mW | TA=25℃ | 1 |
| Junction Temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal resistance junction to ambient | RθJA |  | 625 |  | ℃/W |  | 1 |
| Collector-base breakdown voltage | V(BR)CBO | 60 |  |  | V | IC=10uA, IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | 40 |  |  | V | IC=1mA, IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | 6 |  |  | V | IE=10uA, IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | 0.1 | µA | VCB=60V, IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | 0.1 | µA | 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 |
| DC current gain | hFE | 30 |  |  |  | VCE=1V, Ic=100mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.3 | V | IC=50mA, IB=5 mA | 1 |
| Base-emitter saturation voltage | VBE(sat) |  |  | 0.95 | V | IC=50mA, IB=5 mA | 1 |
| Collector output capacitance | Cob |  |  | 4 | pF | VCB=5V IE=0 f=1MHZ | 1 |
| Input capacitance | Cib |  |  | 8 | pF | VCB=0.5V IC=0 f=1MHZ | 1 |
| Transition frequency | fT | 300 |  |  | MHz | VCE=20V, IC=10mA, f=100MHZ | 1 |

## CAD (KiCad official)

- Symbol: `MMBT3904K`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmbt3904k-etched.step` / `mmbt3904k-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbt3904k.step` / `mmbt3904k.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shikues datasheet](docs/mmbt3904k-datasheet.pdf) (4 pp, sha256 `753bdafe5bff5e95`, retrieved 2026-10-26, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/mmbt3904k-datasheet.pdf)