# DTC143ECA-MS

**MSKSEMI** · Digital Transistors · SOT-23

DTC143ECA-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 | IN | input | Input terminal of the built-in bias-resistor digital transistor; the input voltage VIN is rated from -10 V to +30 V. |
| 2 | GND | power_in | Ground reference terminal for the device. |
| 3 | OUT | output | Output terminal of the NPN digital transistor; output current IO is rated at 100 mA maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| 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 |
|---|---|---|---|---|---|---|---|
| Input voltage (off) | VI(off) |  |  | 0.5 | V | VCC=5V,IO=100µA | 3 |
| Input voltage (on) | VI(on) | 3 |  |  | V | VO=0.3V,IO=20mA | 3 |
| Output voltage (on) | VO(on) |  |  | 0.3 | V | IO/II=10mA/0.5mA | 3 |
| Input current | II |  |  | 1.8 | mA | VI=5V | 3 |
| Output current (off) | IO(off) |  |  | 0.5 | μA | VCC=50V,VI=0 | 3 |
| DC current gain | GI | 20 |  |  |  | VO=5V,IO=10mA | 3 |
| Input resistance | R1 | 3.29 | 4.7 | 6.11 | kΩ |  | 3 |
| Resistance ratio | R2/R1 | 0.8 | 1 | 1.2 |  |  | 3 |
| Supply voltage | VCC |  |  | 50 | V |  | 3 |
| Input voltage | VIN | -10 |  | 30 | V |  | 3 |
| Output current | IO |  |  | 100 | mA |  | 3 |
| Power dissipation | PD |  |  | 200 | mW | Ta=25℃ | 3 |
| Junction temperature | Tj |  |  | 150 | ℃ |  | 3 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 3 |

## CAD (KiCad official)

- Symbol: `DTC143ECA-MS`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `dtc143eca-ms-etched.step` / `dtc143eca-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dtc143eca-ms.step` / `dtc143eca-ms.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](docs/dtc143eca-ms-datasheet.pdf) (9 pp, sha256 `a182ed49128cc14d`, 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/dtc143eca-ms-datasheet.pdf)