# LDTC143XLT1G

**LRC** · Digital Transistors · SOT-23

LDTC143XLT1G from LRC, 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 input of the built-in NPN transistor, which carries the integrated bias resistor network (R1 4.7 kΩ per the device marking table) so no external input resistor is needed; input voltage VIN is rated −10 V to +10 V. |
| 2 | EMITTER | passive | Emitter of the built-in NPN transistor, serving as the reference terminal for the bias network and the inverter configuration; the datasheet gives no separate electrical limit for this pin. |
| 3 | COLLECTOR | output | Collector output of the built-in transistor, rated for output current IO up to 100 mA with supply voltage VCC up to 50 V and device power dissipation of 200 mW. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LRC |
| 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 |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC |  |  | 50 | V |  | 1 |
| Input voltage | VIN | -10 |  | 10 | V |  | 1 |
| Output current | IC |  |  | 100 | mA |  | 1 |
| Power dissipation | PD |  |  | 200 | mW |  | 1 |
| Junction temperature | Tj |  |  | 150 | °C |  | 1 |
| Storage temperature | Tstg | -55 |  | 150 | °C |  | 1 |
| Input resistance | R1 | 3.29 | 4.7 | 6.11 | kΩ |  | 1 |
| Resistance ratio | R2/R1 | 1.7 | 2.1 | 2.6 | − |  | 1 |
| DC current gain | GI | 30 |  |  | − | VO=5V, IO=10mA | 1 |

## CAD (KiCad official)

- Symbol: `LDTC143XLT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ldtc143xlt1g-etched.step` / `ldtc143xlt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ldtc143xlt1g.step` / `ldtc143xlt1g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [LRC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588945049371750400) (3 pp, sha256 `8c23e301e4ca1e77`, retrieved 2026-10-17, 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/ldtc143xlt1g-datasheet.pdf)