# DTC144TCA

**Changjing** · Digital Transistors · SOT-23

DTC144TCA from Changjing, 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 | IN | input | Input pin to the built-in bias resistor network, with input resistor R1 specified at 32.9 kΩ min, 47 kΩ typ, 61.1 kΩ max. |
| 2 | GND | power_in | Ground reference pin for the NPN digital transistor, whose maximum ratings are VCEO 50 V and IC 100 mA. |
| 3 | OUT | output | Output pin of the NPN digital transistor, rated for collector-emitter voltage up to 50 V and collector current up to 100 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-23 |
| Category | Triode/MOS Tube/Transistor |
| 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 |  |  | 50 | V | Ta=25℃ (maximum ratings table) | 2 |
| Collector-emitter voltage | VCEO |  |  | 50 | V | Ta=25℃ (maximum ratings table) | 2 |
| Emitter-base voltage | VEBO |  |  | 5 | V | Ta=25℃ (maximum ratings table) | 2 |
| Collector current | IC |  |  | 100 | mA | Ta=25℃ (maximum ratings table) | 2 |
| Power dissipation (CA column, SOT-23) | PD |  |  | 200 | mW | Ta=25℃ (maximum ratings table) | 2 |
| Operation junction and storage temperature range | TJ,Tstg | -55 |  | 150 | ℃ | Ta=25℃ (maximum ratings table) | 2 |
| Collector-base breakdown voltage | V(BR)CBO | 50 |  |  | V | Ic=50µA,IE=0 | 2 |
| Collector-emitter breakdown voltage | V(BR)CEO | 50 |  |  | V | Ic=1mA,IB=0 | 2 |
| Emitter-base breakdown voltage | V(BR)EBO | 5 |  |  | V | IE=50µA,IC=0 | 2 |
| Collector cut-off current | ICBO |  |  | 0.5 | μA | VCB=50V,IE=0 | 2 |
| Emitter cut-off current | IEBO |  |  | 0.5 | μA | VEB=4V,IC=0 | 2 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.3 | V | IC=5mA,IB=0.5mA | 2 |
| DC current gain | hFE | 100 | 300 | 600 |  | VCE=5V,IC=1mA | 2 |
| Input resistor (R1) | R1 | 32.9 | 47 | 61.1 | kΩ |  | 2 |
| Transition frequency | fT | 250 |  |  | MHz | VCE=10V,IE=-5mA, f=100MHz | 2 |

## CAD (KiCad official)

- Symbol: `DTC144TCA`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `dtc144tca-etched.step` / `dtc144tca-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dtc144tca.step` / `dtc144tca.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/dtc144tca-datasheet.pdf) (15 pp, sha256 `96ec7a9dc19923cf`, retrieved 2026-11-12, 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/dtc144tca-datasheet.pdf)