# DTA123EKAT146

**ROHM Semicon** · Digital Transistors · TO-236-3(SOT-23-3)

DTA123EKAT146 from ROHM Semicon, in a TO-236-3(SOT-23-3). 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 (positive reference) of the PNP digital transistor, with R2 connected between it and the input (base) node. |
| 2 | IN (BASE) | input | Input (base) terminal through built-in R1 of 2.2kΩ, with VI(off) max -0.5V, VI(on) min -3.0V and an absolute maximum input voltage of -12 to 10V. |
| 3 | OUT (COLLECTOR) | output | Output (collector) terminal, rated for output current IO of -100mA and supply voltage VCC of -50V maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ROHM Semicon |
| Package | TO-236-3(SOT-23-3) |
| 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 (ON) | VO(on) |  | -100 | -300 | mV | IO = -10mA, II = -0.5mA | 2 |
| Input current | II |  |  | -3.8 | mA | VI = -5V | 2 |
| Output current (OFF) | 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 |  | 2 |
| Input voltage | VIN | -12 |  | 10 | V |  | 2 |
| Output current | IO | -100 |  |  | mA |  | 2 |
| Collector current | IC(MAX) | -100 |  |  | mA |  | 2 |
| Power dissipation | PD |  |  | 200 | mW | DTA123EKA; each terminal mounted on a reference land | 2 |
| Junction temperature | Tj |  |  | 150 | ℃ |  | 2 |
| Range of storage temperature | Tstg | -55 |  | 150 | ℃ |  | 2 |

## CAD (KiCad official)

- Symbol: `DTA123EKAT146`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: TO-236-3(SOT-23-3) (KiCad packages3D, STEP)
- 3D model files: `dta123ekat146-etched.step` / `dta123ekat146-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dta123ekat146.step` / `dta123ekat146.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ROHM Semicon datasheet](docs/dta123ekat146-datasheet.pdf) (11 pp, sha256 `e06f0ddcc1c4f6d5`, 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/dta123ekat146-datasheet.pdf)