# KMBTA44

**KEXIN** · Bipolar (BJT) · SOT-23

KMBTA44 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 the NPN transistor, driven to saturate the device (for example IB = 1 mA for IC = 10 mA, with VBE(sat) = 0.75 V stated at that condition). |
| 2 | Emitter | passive | Emitter terminal of the NPN transistor; the datasheet limits emitter-base voltage VEBO to 6 V and gives emitter cut-off current IEBO of 100 nA at VEB = 4 V. |
| 3 | Collector | passive | Collector terminal of the NPN transistor; the absolute maximum collector-emitter voltage VCEO is 400 V and continuous collector current IC is 200 mA. |

## 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 breakdown voltage (absolute maximum rating) | VCBO |  |  | 400 | V | Ta = 25℃ | 1 |
| Collector-emitter voltage (absolute maximum rating) | VCEO |  |  | 400 | V | Ta = 25℃ | 1 |
| Emitter-base voltage (absolute maximum rating) | VEBO |  |  | 6 | V | Ta = 25℃ | 1 |
| Collector current - continuous | IC |  |  | 200 | mA | Ta = 25℃ | 1 |
| Collector current - pulsed | ICM |  |  | 300 | mA | Ta = 25℃ | 1 |
| Collector power dissipation | PC |  |  | 350 | mW | Ta = 25℃ | 1 |
| Junction temperature | TJ |  |  | 150 | ℃ | Ta = 25℃ | 1 |
| Storage temperature range | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal resistance from junction to ambient | RθJA |  |  | 357 | ℃/W |  | 1 |
| Collector-base breakdown voltage | VCBO | 400 |  |  | V | Ic= 100 μA, IE= 0 | 1 |
| Collector-emitter breakdown voltage | VCEO | 400 |  |  | V | Ic= 1 mA, IB= 0 | 1 |
| Emitter-base breakdown voltage | VEBO | 6 |  |  | V | IE= 100μA, IC= 0 | 1 |
| Collector-base cut-off current | ICBO |  |  | 100 | nA | VCB= 400 V, IE= 0 | 1 |
| Emitter cut-off current | IEBO |  |  | 100 | nA | VEB= 4V, IC=0 | 1 |
| Collector-emitter saturation voltage | VCE(sat)1 |  |  | 0.2 | V | IC=10 mA, IB=1mA | 1 |
| Collector-emitter saturation voltage | VCE(sat)2 |  |  | 0.3 | V | IC=50 mA, IB=5mA | 1 |
| Base-emitter saturation voltage | VBE(sat) |  |  | 0.75 | V | IC=10 mA, IB=1mA | 1 |
| DC current gain | hFE(1) | 50 |  |  |  | VCE= 10V, IC= 1mA | 1 |
| DC current gain | hFE(2) | 80 |  | 300 |  | VCE= 10V, IC= 10mA | 1 |
| DC current gain | hFE(3) | 40 |  |  |  | VCE= 10V, IC= 50mA | 1 |
| Collector output capacitance | Cob |  |  | 7 | pF | VCB= 20V, IE= 0, f=1MHz | 1 |
| Transition frequency | fT | 50 |  |  | MHz | VCE=20, IC= 10mA, f=30MHz | 1 |

## CAD (KiCad official)

- Symbol: `KMBTA44`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `kmbta44-etched.step` / `kmbta44-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `kmbta44.step` / `kmbta44.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/8588904710875058176) (2 pp, sha256 `4cd8994a80feeb9a`, 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/kmbta44-datasheet.pdf)