# AD-DTC123YCA

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

AD-DTC123YCA 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 of the built-in inverter, connected through R1 (1.54 to 2.86 kΩ) to the base, with VI(off) min 0.3 V, VI(on) max 3 V and an absolute input voltage range of -5 to 12 V. |
| 2 | GND | power_in | Ground connection, tied to the emitter of the NPN transistor and to R2. |
| 3 | OUT | output | Open-collector output of the NPN transistor, rated for up to 100 mA output current and 50 V supply voltage. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-23 |
| Category | Triode/MOS Tube/Transistor |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `AD-DTC123YCA`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ad-dtc123yca-etched.step` / `ad-dtc123yca-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ad-dtc123yca.step` / `ad-dtc123yca.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/ad-dtc123yca-datasheet.pdf) (17 pp, sha256 `42387ca935e5d8fc`, retrieved 2026-11-02, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/ad-dtc123yca-datasheet.pdf)