# PACDN042Y3R

**onsemi** · ESD And Surge Protection (TVS/ESD) · SOT-23

PACDN042Y3R from onsemi, 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 | Cathode | passive | Cathode of the surge protection diode, to be connected to the node requiring transient voltage protection. |
| 2 | Cathode | passive | Cathode of the surge protection diode, to be connected to the node requiring transient voltage protection. |
| 3 | GND | power_in | Anode of the surge protection diodes, to be grounded. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOT-23 |
| Category | Circuit Protection |
| 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 |
|---|---|---|---|---|---|---|---|
| Leakage Current | ILEAK |  | 1 | 100 | nA | VIN = 5.0 VDC, TA = 25°C | 3 |
| Small Signal Clamp Voltage Positive Clamp | VSIG | 6.2 | 6.8 | 8 | V | I = 10 mA, TA = 25°C | 3 |
| Small Signal Clamp Voltage Negative Clamp | VSIG | -0.4 | -0.8 | -1.2 | V | I = −10 mA, TA = 25°C | 3 |
| ESD Withstand Voltage Human Body Model | VESD | -30 |  | 30 | kV | Human Body Model, MIL−STD−883, Method 3015 | 3 |
| ESD Withstand Voltage Contact Discharge | VESD | -20 |  | 20 | kV | Contact Discharge per IEC 61000−4−2 Standard (Note 1) | 3 |
| Operating Temperature |  | -40 |  | 85 | °C |  | 3 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 3 |
| Package Power Dissipation |  |  |  | 0.225 | W | SOT23−3, SOT23−5, SOT23−6, SOT−143 package | 3 |

## CAD (KiCad official)

- Symbol: `PACDN042Y3R`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `pacdn042y3r-etched.step` / `pacdn042y3r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pacdn042y3r.step` / `pacdn042y3r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588886810151276544) (14 pp, sha256 `ad3782f02c7362b4`, retrieved 2026-10-17, tier: lcsc)
- **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/pacdn042y3r-datasheet.pdf)