# PESD3V3L1BA

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

PESD3V3L1BA from UMW, 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 | 1 | passive | Bidirectional TVS terminal 1 (no polarity), connects to the protected line; VRWM 3.3V max stand-off, 480W peak pulse power (8/20µs). |
| 2 | 2 | passive | Bidirectional TVS terminal 2 (no polarity), connects to ground or the second protected node; VRWM 3.3V max stand-off, ±30kV IEC 61000-4-2 contact ESD. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse Stand-Off Voltage | VRWM |  |  | 3.3 | V |  | 3 |
| Reverse Breakdown Voltage | VBR | 4 |  |  | V | IT=1mA | 3 |
| Reverse Leakage Current | IR |  |  | 1 | µA | VRWM=3V, T=25°C | 3 |
| Clamping Voltage | VC |  |  | 24 | V | IPP=20A, tp=8/20μs | 3 |
| Junction Capacitance | CJ |  |  | 100 | pF | VR=0V, f=1MHz | 3 |
| Peak Pulse Power | PPP |  |  | 480 | W | tp=8/20μs | 2 |
| Peak Pulse Current | IPP |  |  | 20 | A | tp=8/20μs (note 1) | 2 |
| ESD per IEC 61000-4-2 (Air) | VESD |  |  | 30 | kV | IEC 61000-4-2 air discharge | 2 |
| ESD per IEC 61000-4-2 (Contact) | VESD |  |  | 30 | kV | IEC 61000-4-2 contact discharge | 2 |
| Lead Soldering Temperature | TL |  |  | 260 | °C |  | 2 |
| Junction Temperature | TJ | -55 |  | 150 | °C |  | 2 |
| Storage Temperature | TSTG | -55 |  | 150 | °C |  | 2 |

## CAD (KiCad official)

- Symbol: `PESD3V3L1BA`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `pesd3v3l1ba-etched.step` / `pesd3v3l1ba-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pesd3v3l1ba.step` / `pesd3v3l1ba.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UMW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8755880639461765120) (7 pp, sha256 `4814197bfe8e2863`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/pesd3v3l1ba-datasheet.pdf)