# DDTA123YCA

**Yangzhou Yangjie Elec Tech** · Digital Transistors · SOT-23

DDTA123YCA from Yangzhou Yangjie Elec Tech, 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 through built-in series resistor R1 (typ. 2.2 kΩ) to the PNP base; input voltage rated -12 V to +5 V. |
| 2 | GND | power_in | Ground/common (GND(+)) connected to the emitter and R2; this is the positive reference for the PNP, with supply voltage VCC rated -50 V. |
| 3 | OUT | output | Output (collector) of the PNP digital transistor, rated for output current up to -500 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | SOT-23 |
| Category | Transistors |
| 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 | -12 |  | 5 | V |  | 1 |
| Output Current | IO |  |  | -500 | mA |  | 1 |
| Power Dissipation | PD |  |  | 200 | mW |  | 1 |
| Junction Temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | ℃ |  | 1 |
| DC current gain | GI | 56 |  |  |  | Vo=-5V, Io=-50mA | 2 |
| Input resistance | R1 | 1.54 | 2.2 | 2.86 | kΩ |  | 2 |
| Resistance ratio | R2/R1 | 3.6 | 4.5 | 5.5 |  |  | 2 |
| Input voltage (off) | VI(off) |  |  | -0.5 | V | VCC=-5V,Ic=-100uA | 2 |
| Input voltage (on) | VI(on) | -2 |  |  | V | VO=-0.3V,Ic=-20mA | 2 |
| Output voltage | Vo(on) |  |  | -0.3 | V | Io /Ii =-10mA/-0.5 mA | 2 |
| Input current | II |  |  | -3.8 | mA | VI=-5V | 2 |
| Output current (off) | IO(off) |  |  | -0.5 | uA | VCC=-50V, Vi=0 | 2 |
| Transition frequency | fT |  | 200 |  | MHz | VCE=-10V,IE=5mA,f=100MHz | 2 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |

## CAD (KiCad official)

- Symbol: `DDTA123YCA`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ddta123yca-etched.step` / `ddta123yca-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ddta123yca.step` / `ddta123yca.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](docs/ddta123yca-datasheet.pdf) (5 pp, sha256 `69840b77c507cc57`, retrieved 2026-10-28, 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/ddta123yca-datasheet.pdf)