# PDTA124ET-QR

**Nexperia** · Digital Transistors · SOT-23

PDTA124ET-QR from Nexperia, 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 | I | input | Input pin (base) that drives the built-in transistor through bias resistor R1, which is 22 kΩ with a 15.4 to 28.6 kΩ range. |
| 2 | GND | power_in | Ground pin (emitter) of the built-in transistor. |
| 3 | O | output | Output pin (collector) of the built-in transistor, which is rated for an output current of -100 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| 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 |
|---|---|---|---|---|---|---|---|
| collector-base voltage | VCBO |  |  | -50 | V | open emitter | 3 |
| collector-emitter voltage | VCEO |  |  | -50 | V | open base | 3 |
| emitter-base voltage | VEBO |  |  | -10 | V | open collector | 3 |
| input voltage | VI |  |  | 10 | V | positive | 3 |
| input voltage | VI |  |  | -40 | V | negative | 3 |
| output current | IO |  |  | -100 | mA |  | 3 |
| total power dissipation | Ptot |  |  | 250 | mW | Tamb ≤ 25 °C; device mounted on FR4 PCB, single-sided, 35 μm copper, tin-plated and standard footprint | 3 |
| junction temperature | Tj |  |  | 150 | °C |  | 3 |
| ambient temperature | Tamb | -65 |  | 150 | °C |  | 3 |
| storage temperature | Tstg | -65 |  | 150 | °C |  | 3 |
| thermal resistance from junction to ambient | Rth(j-a) |  |  | 500 | K/W | in free air; device mounted on FR4 PCB, single-sided, 35 μm copper, tin-plated and standard footprint | 4 |
| collector-base breakdown voltage | V(BR)CBO | -50 |  |  | V | IC = -100 µA; IE = 0 A; Tamb = 25 °C | 5 |
| collector-emitter breakdown voltage | V(BR)CEO | -50 |  |  | V | IC = -2 mA; IB = 0 A; Tamb = 25 °C | 5 |
| collector-base cut-off current | ICBO |  |  | -100 | nA | VCB = -50 V; IE = 0 A; Tamb = 25 °C | 5 |
| collector-emitter cut-off current | ICEO |  |  | -100 | nA | VCE = -30 V; IB = 0 A; Tamb = 25 °C | 5 |
| collector-emitter cut-off current | ICEO |  |  | -5 | µA | VCE = -30 V; IB = 0 A; Tj = 150 °C | 5 |
| emitter-base cut-off current | IEBO |  |  | -180 | µA | VEB = -5 V; IC = 0 A; Tamb = 25 °C | 5 |
| DC current gain | hFE | 60 |  |  |  | VCE = -5 V; IC = -5 mA; Tamb = 25 °C | 5 |
| collector-emitter saturation voltage | VCEsat |  |  | -150 | mV | IC = -10 mA; IB = -0.5 mA; Tamb = 25 °C | 5 |
| off-state input voltage | VI(off) |  | -1.1 | -0.8 | V | VCE = -5 V; IC = -100 µA; Tamb = 25 °C | 5 |
| on-state input voltage | VI(on) | -2.5 | -1.7 |  | V | VCE = -0.3 V; IC = -5 mA; Tamb = 25 °C | 5 |
| bias resistor 1 (input) | R1 | 15.4 | 22 | 28.6 | kΩ |  | 5 |
| bias resistor ratio | R2/R1 | 0.8 | 1 | 1.2 |  |  | 5 |
| collector capacitance | Cc |  |  | 3 | pF | VCB = -10 V; IE = 0 A; ie = 0 A; f = 1 MHz; Tamb = 25 °C | 5 |

## CAD (KiCad official)

- Symbol: `PDTA124ET-QR`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `pdta124et-qr-etched.step` / `pdta124et-qr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pdta124et-qr.step` / `pdta124et-qr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Nexperia datasheet](https://assets.nexperia.com/documents/data-sheet/PDTA124ET-QR.pdf) (11 pp, sha256 `f746d0dfca32756c`, retrieved 2026-11-02, tier: manufacturer)
- **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/pdta124et-qr-datasheet.pdf)