# PDTC124XU

**Nexperia** · Bipolar Transistors - BJT · SOT-323

PDTC124XU from Nexperia, 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 | I | input | Input (base) of the transistor, connected through the built-in 22 kΩ bias resistor R1; input voltage is rated from -7 V to 40 V. |
| 2 | GND | power_in | Ground (emitter) pin; the emitter is the reference for the input and output, with VEBO limited to 7 V. |
| 3 | O | output | Output (collector) pin, which is rated for a maximum output current of 100 mA and a collector-emitter voltage VCEO of 50 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOT-323 |
| Category | Triode/MOS Tube/Transistor |
| 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 |  |  | 7 | V | open collector | 3 |
| input voltage | VI | -7 |  | 40 | V |  | 3 |
| output current | IO |  |  | 100 | mA |  | 3 |
| peak collector current | ICM |  |  | 100 | mA | tp ≤ 1 ms; single pulse | 3 |
| total power dissipation | Ptot |  |  | 200 | mW | Tamb ≤ 25 °C | 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) |  |  | 625 | K/W | in free air | 3 |
| collector-base cut-off current | ICBO |  |  | 100 | nA | VCB = 50 V; IE = 0 A; Tamb = 25 °C | 4 |
| collector-emitter cut-off current | ICEO |  |  | 100 | nA | VCE = 30 V; IB = 0 A; Tamb = 25 °C | 4 |
| collector-emitter cut-off current | ICEO |  |  | 5 | µA | VCE = 30 V; IB = 0 A; Tj = 150 °C | 4 |
| emitter-base cut-off current | IEBO |  |  | 120 | µA | VEB = 5 V; IC = 0 A; Tamb = 25 °C | 4 |
| DC current gain | hFE | 80 |  |  |  | VCE = 5 V; IC = 5 mA; Tamb = 25 °C | 4 |
| collector-emitter saturation voltage | VCEsat |  |  | 150 | mV | IC = 10 mA; IB = 0.5 mA; Tamb = 25 °C | 4 |
| off-state input voltage | VI(off) |  | 0.8 | 0.5 | V | VCE = 5 V; IC = 100 µA; Tamb = 25 °C | 4 |
| on-state input voltage | VI(on) | 2 | 1.1 |  | V | VCE = 300 mV; IC = 2 mA; Tamb = 25 °C | 4 |
| bias resistor 1 (input) | R1 | 15.4 | 22 | 28.6 | kΩ |  | 4 |
| bias resistor ratio | R2/R1 | 1.7 | 2.1 | 2.6 |  | Tamb = 25 °C | 4 |
| collector capacitance | Cc |  |  | 2.5 | pF | VCB = 10 V; IE = 0 A; ie = 0 A; f = 1 MHz; Tamb = 25 °C | 4 |
| bias resistor 2 (nominal, from title) | R2 |  | 47 |  | kΩ |  | 1 |

## CAD (KiCad official)

- Symbol: `PDTC124XU`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `pdtc124xu-etched.step` / `pdtc124xu-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pdtc124xu.step` / `pdtc124xu.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/PDTC124XU.pdf) (9 pp, sha256 `ff366769439105a1`, retrieved 2026-10-30, 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/pdtc124xu-datasheet.pdf)