# MMBT5401-MS

**MSKSEMI** · Bipolar (BJT) · SOT-23

MMBT5401-MS from MSKSEMI, 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 | passive | Base terminal of the PNP transistor; the emitter-base limit is VEBO -5 V and the base is driven with IB test conditions such as -1 mA for IC=-10 mA. |
| 2 | EMITTER | passive | Emitter terminal of the PNP transistor; the emitter-base rating is -5 V (VEBO) and the device collector current is limited to IC -0.6 A. |
| 3 | COLLECTOR | passive | Collector terminal of the PNP transistor; rated for VCBO -160 V, VCEO -150 V, IC -0.6 A and collector power dissipation PC 0.3 W. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| 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 breakdown voltage | V(BR)CBO | -160 |  |  | V | IC=-100µA, IE=0 | 2 |
| Collector-emitter breakdown voltage | V(BR)CEO | -150 |  |  | V | IC=-1mA, IB=0 | 2 |
| Emitter-base breakdown voltage | V(BR)EBO | -5 |  |  | V | IE=-10µA, IC=0 | 2 |
| Collector cut-off current | ICBO |  |  | -0.1 | μA | VCB=-120V, IE=0 | 2 |
| Emitter cut-off current | IEBO |  |  | -0.1 | μA | VEB=-4V, IC=0 | 2 |
| DC current gain | hFE(1) | 80 |  |  |  | VCE=-5V, IC=-1mA | 2 |
| DC current gain | hFE(2) | 100 |  | 300 |  | VCE=-5V, IC=-10mA | 2 |
| DC current gain | hFE(3) | 50 |  |  |  | VCE=-5V, IC=-50mA | 2 |
| Collector-emitter saturation voltage | VCE(sat)1 |  |  | -0.2 | V | IC=-10mA, IB=-1mA | 2 |
| Collector-emitter saturation voltage | VCE(sat)2 |  |  | -0.5 | V | IC=-50mA, IB=-5mA | 2 |
| Base-emitter saturation voltage | VBE(sat)1 |  |  | -1 | V | IC=-10mA, IB=-1mA | 2 |
| Transition frequency | fT | 100 |  |  | MHz | VCE=-5V, IC=-10mA, f=30MHz | 2 |
| Collector-base voltage | VCBO |  |  | -160 | V |  | 2 |
| Collector-emitter voltage | VCEO |  |  | -150 | V |  | 2 |
| Emitter-base voltage | VEBO |  |  | -5 | V |  | 2 |
| Collector current | IC |  |  | -0.6 | A |  | 2 |
| Collector power dissipation | PC |  |  | 0.3 | W |  | 2 |
| Junction temperature | Tj |  |  | 150 | ℃ |  | 2 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 2 |
| Thermal resistance from junction to ambient | R。JA |  |  | 416 | ℃/W |  | 2 |

## CAD (KiCad official)

- Symbol: `MMBT5401-MS`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmbt5401-ms-etched.step` / `mmbt5401-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbt5401-ms.step` / `mmbt5401-ms.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589834603876941824) (5 pp, sha256 `ba346250ea323d2c`, 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/mmbt5401-ms-datasheet.pdf)