# MMBTA14W

**ST Semtech** · Darlington Transistors · SOT-323

MMBTA14W from ST Semtech, in a SOT-323. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | B | input | Base - NPN Darlington input; VBE(on) max 2 V at IC = 100 mA, VCE = 5 V; hFE min 10000 at IC = 10 mA. |
| 2 | E | passive | Emitter - NPN Darlington emitter; VEBO max 10 V; IEBO max 100 nA at VEB = 10 V. |
| 3 | C | passive | Collector - NPN Darlington collector; VCES 30 V, IC max 500 mA, VCE(sat) max 1.5 V at IC = 100 mA / IB = 0.1 mA, Ptot max 200 mW. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ST Semtech |
| Package | SOT-323 |
| 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 |
|---|---|---|---|---|---|---|---|
| DC Current Gain (VCE = 5 V, IC = 10 mA) | hFE | 10000 |  |  |  | VCE = 5 V, IC = 10 mA | 1 |
| DC Current Gain (VCE = 5 V, IC = 100 mA) | hFE | 20000 |  |  |  | VCE = 5 V, IC = 100 mA | 1 |
| Collector Emitter Breakdown Voltage | V(BR)CES | 30 |  |  | V | IC = 100 µA | 1 |
| Collector Cutoff Current | ICBO |  |  | 100 | nA | VCB = 30 V | 1 |
| Emitter Cutoff Current | IEBO |  |  | 100 | nA | VEB = 10 V | 1 |
| Collector Emitter Saturation Voltage | VCE(sat) |  |  | 1.5 | V | IC = 100 mA, IB = 0.1 mA | 1 |
| Base Emitter On Voltage | VBE(on) |  |  | 2 | V | IC = 100 mA, VCE = 5 V | 1 |
| Current Gain Bandwidth Product | fT | 125 |  |  | MHz | VCE = 5 V, IC = 10 mA, f = 100 MHz | 1 |
| Collector Emitter Voltage | VCES |  |  | 30 | V | Ta = 25℃ | 1 |
| Collector Base Voltage | VCBO |  |  | 30 | V | Ta = 25℃ | 1 |
| Emitter Base Voltage | VEBO |  |  | 10 | V | Ta = 25℃ | 1 |
| Collector Current | IC |  |  | 500 | mA | Ta = 25℃ | 1 |
| Power Dissipation | Ptot |  |  | 200 | mW | Ta = 25℃ | 1 |
| Junction Temperature | Tj |  |  | 150 | ℃ | Ta = 25℃ | 1 |
| Storage Temperature Range | TStg | -55 |  | 150 | ℃ | Ta = 25℃ | 1 |

## CAD (KiCad official)

- Symbol: `MMBTA14W`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `mmbta14w-etched.step` / `mmbta14w-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbta14w.step` / `mmbta14w.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ST Semtech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588913733490126848) (1 pp, sha256 `3ffd180dac9050a8`, retrieved 2026-09-21, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-sonnet-4-6` (text+vision), consensus `claude-opus-4-7` (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/mmbta14w-datasheet.pdf)