# PESD12VS1UB

**UMW** · ESD And Surge Protection (TVS/ESD) · SOD-523

PESD12VS1UB from UMW, in a SOD-523. 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 | Pin1 | passive | One terminal of the unidirectional ESD protection diode that protects one transmission or data line; for PESD12VS1UB the reverse standoff voltage VRWM is 12 V. Anode or cathode assignment is not stated in the datasheet text. |
| 2 | Pin2 | passive | The other terminal of the unidirectional ESD protection diode that protects one transmission or data line; for PESD12VS1UB the diode capacitance is 38 pF typical at VR=0V, f=1MHz. Anode or cathode assignment is not stated in the datasheet text. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | SOD-523 |
| 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 | 14.7 | 15 | 15.3 | V | IR=5mA | 5 |
| reverse leakage current | IRM |  |  | 50 | nA | VRWM=12V | 5 |
| diode capacitance | Cd |  | 38 | 75 | pF | VR=0V, f=1MHz | 5 |
| peak pulse power | PPP |  |  | 180 | W | 8/20 μs(1) | 3 |
| peak pulse current | IPP |  |  | 5 | A | 8/20 μs(1) | 3 |
| junction temperature | TJ |  |  | 150 | °C |  | 3 |
| junction ambient temperature | Tamb | -65 |  | 150 | °C |  | 3 |
| storage temperature | TSTG | -65 |  | 150 | °C |  | 3 |
| electrostatic discharge capability (IEC 61000-4-2 contact discharge) | ESD |  |  | 30 | kV | IEC 61000-4-2 (contact discharge) | 4 |
| electrostatic discharge capability (HBM MIL-STD883) | ESD |  |  | 10 | kV | HBM MIL-STD883 | 4 |
| reverse standoff voltage | VRWM |  | 12 |  | V |  | 5 |
| clamping voltage | V(CL)R |  | 19 |  | V | IPP=1A | 6 |
| clamping voltage | V(CL)R |  | 35 |  | V | IPP=5A | 6 |
| differential resistance | Rdiff |  | 200 |  | Ω | IR=1mA | 6 |

## CAD (KiCad official)

- Symbol: `PESD12VS1UB`
- Footprint: `Diode_SMD:D_SOD-523`
- 3D model: SOD-523 (KiCad packages3D, STEP)
- 3D model files: `pesd12vs1ub-etched.step` / `pesd12vs1ub-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pesd12vs1ub.step` / `pesd12vs1ub.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UMW datasheet](docs/pesd12vs1ub-datasheet.pdf) (12 pp, sha256 `9cb60909210c314b`, retrieved 2026-10-21, 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/pesd12vs1ub-datasheet.pdf)