# DTC143TUA

**Changjing** · Digital Transistors · SOT-323

DTC143TUA from Changjing, in a SOT-323. 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 terminal of the digital transistor, connected to the built-in input bias resistor R1, which the datasheet specifies as 4.7 kΩ typical (3.29 kΩ min, 6.11 kΩ max). |
| 2 | GND | power_in | Ground (common) terminal of the digital transistor. |
| 3 | OUT | output | Output terminal of the NPN digital transistor; the maximum ratings are VCEO 50 V and collector current IC 100 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| 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 |
|---|---|---|---|---|---|---|---|
| Collector-Base Voltage | VCBO |  |  | 50 | V |  | 2 |
| Collector-Emitter Voltage | VCEO |  |  | 50 | V |  | 2 |
| Emitter-Base Voltage | VEBO |  |  | 5 | V |  | 2 |
| Collector Current | IC |  |  | 100 | mA |  | 2 |
| Power Dissipation (UA column, SOT-323) | PD |  |  | 200 | mW |  | 2 |
| Junction Temperature | Tj |  |  | 150 | ℃ |  | 2 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 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=0.25mA | 2 |
| DC current gain | hFE | 100 |  | 600 |  | VCE=5V,IC=1mA | 2 |
| Input resistor | R1 | 3.29 | 4.7 | 6.11 | kΩ |  | 2 |
| Transition frequency | fT | 250 |  |  | MHz | VCE=10V,IE=-5mA, f=100MHz | 2 |

## CAD (KiCad official)

- Symbol: `DTC143TUA`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `dtc143tua-etched.step` / `dtc143tua-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dtc143tua.step` / `dtc143tua.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590931048328863744) (15 pp, sha256 `388270cd5f58d663`, 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/dtc143tua-datasheet.pdf)