# DTA123EUAT106

**ROHM Semicon** · Digital Transistors · SOT-323

DTA123EUAT106 from ROHM Semicon, in a SOT-323. 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 | GND (+) (EMITTER) | power_in | Ground/emitter terminal, connected to R2 and the emitter of the built-in PNP transistor (positive-side reference in the inner circuit). |
| 2 | IN (BASE) | input | Input terminal (base) through built-in R1 = 2.2kΩ; VI(off) max -0.5V at VCC = -5V, VI(on) min -3.0V, input voltage rating -12 to 10V. |
| 3 | OUT (COLLECTOR) | output | Output terminal (collector) of the built-in PNP transistor; output current rated -100mA and supply voltage -50V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ROHM Semicon |
| Package | SOT-323 |
| 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 = -0.3V, IO = -20mA | 2 |
| Output voltage | VO(on) |  | -100 | -300 | mV | IO = -10mA, II = -0.5mA | 2 |
| Input current | II |  |  | -3.8 | mA | VI = -5V | 2 |
| Output current | IO(off) |  |  | -500 | nA | VCC = -50V, VI = 0V | 2 |
| DC current gain | GI | 20 |  |  | - | VO = -5V, IO = -20mA | 2 |
| Input resistance | R1 | 1.54 | 2.2 | 2.86 | kΩ |  | 2 |
| Resistance ratio | R2/R1 | 0.8 | 1 | 1.2 | - |  | 2 |
| Supply voltage | VCC |  |  | -50 | V | Ta = 25°C | 2 |
| Input voltage | VIN | -12 |  | 10 | V | Ta = 25°C | 2 |
| Output current | IO |  |  | -100 | mA | Ta = 25°C | 2 |
| Collector current | IC(MAX) |  |  | -100 | mA | Ta = 25°C, characteristics of built-in transistor | 2 |
| Power dissipation | PD |  |  | 200 | mW | DTA123EUA, each terminal mounted on a reference land | 2 |
| Junction temperature | Tj |  |  | 150 | ℃ |  | 2 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 2 |
| Transition frequency | fT |  | 250 |  | MHz | VCE = -10V, IE = 5mA, f = 100MHz | 2 |

## CAD (KiCad official)

- Symbol: `DTA123EUAT106`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `dta123euat106-etched.step` / `dta123euat106-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dta123euat106.step` / `dta123euat106.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ROHM Semicon datasheet](docs/dta123euat106-datasheet.pdf) (11 pp, sha256 `cd5db3d0bd3fc365`, retrieved 2026-10-31, tier: manufacturer)
- **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/dta123euat106-datasheet.pdf)