# PDTB123ET

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

PDTB123ET 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 connected to the transistor base through the bias resistor R1 (2.2 kΩ); input voltage limits are -12 V to 10 V per the absolute maximum ratings. |
| 2 | GND | power_in | Ground pin connected to the transistor emitter. |
| 3 | O | output | Output pin connected to the transistor collector, rated for an output current of -500 mA (absolute maximum). |

## 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 | 2 |
| collector-emitter voltage | VCEO |  |  | -50 | V | open base | 2 |
| emitter-base voltage | VEBO |  |  | -10 | V | open collector | 2 |
| input voltage | VI | -12 |  | 10 | V |  | 2 |
| output current | IO |  |  | -500 | mA |  | 2 |
| total power dissipation | Ptot |  |  | 250 | mW | Tamb ≤ 25 °C | 2 |
| junction temperature | Tj |  |  | 150 | °C |  | 2 |
| ambient temperature | Tamb | -65 |  | 150 | °C |  | 2 |
| storage temperature | Tstg | -65 |  | 150 | °C |  | 2 |
| thermal resistance from junction to ambient | Rth(j-a) |  |  | 500 | K/W | in free air | 3 |
| collector-base cut-off current | ICBO |  |  | -100 | nA | VCB = -40 V; IE = 0 A; Tamb = 25 °C | 3 |
| collector-emitter cut-off current | ICEO |  |  | -0.5 | µA | VCE = -50 V; IB = 0 A; Tamb = 25 °C | 3 |
| emitter-base cut-off current | IEBO |  |  | -2 | mA | VEB = -5 V; IC = 0 A; Tamb = 25 °C | 3 |
| DC current gain | hFE | 40 |  |  |  | VCE = -5 V; IC = -50 mA; Tamb = 25 °C | 3 |
| collector-emitter saturation voltage | VCEsat |  |  | -0.3 | V | IC = -50 mA; IB = -2.5 mA; Tamb = 25 °C | 3 |
| off-state input voltage | VI(off) | -0.6 | -1.1 | -1.8 | V | VCE = -5 V; IC = -100 µA; Tamb = 25 °C | 3 |
| on-state input voltage | VI(on) | -1 | -1.5 | -2 | V | VCE = -0.3 V; IC = -20 mA; Tamb = 25 °C | 3 |
| bias resistor 1 (input) | R1 | 1.54 | 2.2 | 2.86 | kΩ |  | 3 |
| bias resistor ratio R2/R1 | R2/R1 | 0.9 | 1 | 1.1 |  | Tamb = 25 °C | 3 |

## CAD (KiCad official)

- Symbol: `PDTB123ET`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `pdtb123et-etched.step` / `pdtb123et-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pdtb123et.step` / `pdtb123et.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/PDTB123ET.pdf) (8 pp, sha256 `a57e3d54e68bd251`, retrieved 2026-10-17, 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/pdtb123et-datasheet.pdf)