# AD-DTA123YCA

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

AD-DTA123YCA 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 | Base input through built-in resistor R1 (2.2 kΩ typ), with input voltage range -12 V to +5 V, VI(off) min -0.3 V and VI(on) max -3 V. |
| 2 | GND | power_in | Ground (+) terminal connected to the emitter, with supply voltage Vcc rated -50 V. |
| 3 | OUT | output | Collector output with rated output current IO of -100 mA and output-off current IO(off) max -0.5 µA at VCC = -50 V. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `AD-DTA123YCA`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ad-dta123yca-etched.step` / `ad-dta123yca-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ad-dta123yca.step` / `ad-dta123yca.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/ad-dta123yca-datasheet.pdf) (17 pp, sha256 `1668fb2432f6db5a`, 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-dta123yca-datasheet.pdf)