# DTA124ECA

**Changjiang Electronics Tech (CJ)** · Digital Transistors · SOT-23

DTA124ECA from Changjiang Electronics Tech (CJ), 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 pin of the built-in bias-resistor inverter, with the input voltage limited to -40 V to +10 V (VIN) and VI(off) at most -0.5 V when VCC=-5 V and IO=-100 µA. |
| 2 | GND | power_in | Ground pin as labeled in the datasheet pin connection; the datasheet states no separate electrical limits for this pin. |
| 3 | OUT | output | Output pin with output current limited to -30 mA (IO) and an output voltage VO(on) of at most -0.3 V at IO/II = -10 mA/-0.5 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjiang Electronics Tech (CJ) |
| 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 |
|---|---|---|---|---|---|---|---|
| Input voltage (off) | VI(off) |  |  | -0.5 | V | VCC=-5V,IO=-100µA | 2 |
| Input voltage (on) | VI(on) | -3 |  |  | V | VO=-0.2V,IO=-5 mA | 2 |
| Output voltage | VO(on) |  |  | -0.3 | V | IO/II=-10mA/-0.5mA | 2 |
| Input current | II |  |  | -0.36 | mA | VI=-5V | 2 |
| Output current | IO(off) |  |  | -0.5 | μA | VCC=-50V,VI=0 | 2 |
| DC current gain | GI | 56 |  |  |  | VO=-5V,IO=-5mA | 2 |
| Input resistance | R1 | 15.4 | 22 | 28.6 | kΩ |  | 2 |
| Resistance ratio | R2/R1 | 0.8 | 1 | 1.2 |  |  | 2 |
| Supply voltage | VCC | -50 |  |  | V | Ta=25℃ | 2 |
| Input voltage | VIN | -40 |  | 10 | V | Ta=25℃ | 2 |
| Output current | IO | -30 |  |  | mA | Ta=25℃ | 2 |
| Peak collector current | ICM | -100 |  |  | mA | Ta=25℃ | 2 |
| Power dissipation | PD |  |  | 200 | mW | Ta=25℃, CA column | 2 |
| Operation junction and storage temperature range | TJ,Tstg | -55 |  | 150 | ℃ |  | 2 |
| Transition frequency | fT |  | 250 |  | MHz | VO=-10V,IO=-5mA,f=100MHz | 2 |

## CAD (KiCad official)

- Symbol: `DTA124ECA`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `dta124eca-etched.step` / `dta124eca-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dta124eca.step` / `dta124eca.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjiang Electronics Tech (CJ) datasheet](docs/dta124eca-datasheet.pdf) (15 pp, sha256 `f00cf23dd89e1acd`, retrieved 2026-11-13, 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/dta124eca-datasheet.pdf)