# PESD3V3U1UA

**Nexperia** · ESD And Surge Protection (TVS/ESD) · SOD-323

PESD3V3U1UA from Nexperia, in a SOD-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 | K | passive | Cathode of the unidirectional ESD protection diode, marked by the marking bar; connects to the protected line (VRWM 3.3 V max, Cd 2.6 pF typ pin 1 to 2). |
| 2 | A | passive | Anode of the unidirectional ESD protection diode, connected to ground in the application. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOD-323 |
| Category | Circuit Protection |
| Pins | 2 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| breakdown voltage | VBR | 4.5 | 5.6 | 6.8 | V | IR = 5 mA; Tamb = 25 °C; measured from pin 1 to 2 | 4 |
| reverse leakage current | IRM |  | 1 | 100 | nA | VRWM = 3 V; Tamb = 25 °C | 4 |
| diode capacitance | Cd |  | 2.6 | 3.1 | pF | f = 1 MHz; VR = 0 V; Tamb = 25 °C; measured from pin 1 to 2 | 4 |
| differential resistance | Rdiff |  |  | 100 | Ω | IR = 5 mA; Tamb = 25 °C | 4 |
| reverse standoff voltage | VRWM |  |  | 3.3 | V | Tamb = 25 °C | 4 |
| junction temperature | Tj |  |  | 150 | °C |  | 3 |
| ambient temperature | Tamb | -55 |  | 150 | °C |  | 3 |
| storage temperature | Tstg | -65 |  | 150 | °C |  | 3 |
| electrostatic discharge voltage (contact) | VESD |  |  | 9 | kV | IEC 61000-4-2; contact discharge; ten non-repetitive ESD pulses | 3 |
| electrostatic discharge voltage (HBM) | VESD |  |  | 10 | kV | MIL-STD-883; human body model (HBM) | 3 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | pet |  | voltage MIL-STD-883; human body model (HBM) - 10 kV [1] Device stressed with ten non-repetitive ESD pulses. | 3 |

## CAD (KiCad official)

- Symbol: `PESD3V3U1UA`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `pesd3v3u1ua-etched.step` / `pesd3v3u1ua-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pesd3v3u1ua.step` / `pesd3v3u1ua.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/PESD3V3U1UA.pdf) (11 pp, sha256 `566b40d2dee03df7`, retrieved 2026-10-22, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/pesd3v3u1ua-datasheet.pdf)