# DTC124EUAFRAT106

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

DTC124EUAFRAT106 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 of the built-in NPN transistor, connected to R2 as shown in the inner circuit. |
| 2 | IN (BASE) | input | Input / base of the transistor through built-in R1 = 22kΩ, with input voltage rated -10 to 40 V and VI(off) max 0.5 V, VI(on) min 3.0 V. |
| 3 | OUT (COLLECTOR) | output | Output / collector of the transistor, with supply voltage VCC max 50 V and collector current IC(MAX) 100 mA. |

## 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 = 0.2V, IO = 5mA | 2 |
| Output voltage (ON) | VO(on) |  | 100 | 300 | mV | IO = 10mA, II = 0.5mA | 2 |
| Input current | II |  |  | 360 | μA | VI = 5V | 2 |
| Output current (OFF) | IO(off) |  |  | 500 | nA | VCC = 50V, VI = 0V | 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 |  | 2 |
| Input voltage | VIN | -10 |  | 40 | V |  | 2 |
| Output current | IO |  |  | 30 | mA |  | 2 |
| Collector current | IC(MAX) |  |  | 100 | mA |  | 2 |
| Power dissipation | PD |  |  | 200 | mW | 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: `DTC124EUAFRAT106`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `dtc124euafrat106-etched.step` / `dtc124euafrat106-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dtc124euafrat106.step` / `dtc124euafrat106.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ROHM Semicon datasheet](docs/dtc124euafrat106-datasheet.pdf) (7 pp, sha256 `18d50435d0224405`, retrieved 2026-11-05, 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/dtc124euafrat106-datasheet.pdf)