# SET23A12L02-E18

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

SET23A12L02-E18 from UMW, 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/O1 | passive | Protected I/O line 1 (diode cathode in the pinning schematic) with 12V reverse stand-off voltage, 13.3V minimum breakdown at 1mA and 100pF maximum capacitance to GND. |
| 2 | I/O2 | passive | Protected I/O line 2 (diode cathode in the pinning schematic) with 12V reverse stand-off voltage, 13.3V minimum breakdown at 1mA and 100pF maximum capacitance to GND. |
| 3 | GND | power_in | Common ground pin shared by both TVS diodes (anode side in the pinning schematic), the reference for the I/O pins' clamping. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| 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 |
|---|---|---|---|---|---|---|---|
| Peak Pulse Power | PPP |  |  | 500 | W | tp=8/20μs waveform | 2 |
| ESD voltage (Contact discharge) | VESD | -30 |  | 30 | kV | Contact discharge | 2 |
| ESD voltage (Air discharge) | VESD | -30 |  | 30 | kV | Air discharge | 2 |
| Storage & junction temperature range | TJ,TSTG | -55 |  | 150 | °C | Storage & junction temperature range | 2 |
| Reverse Breakdown Voltage | VBR | 13.3 |  |  | V | IBR=1mA | 3 |
| Reverse Leakage Current | IR |  |  | 1 | µA | VR=12V, Each I/O pin | 3 |
| Clamping voltage (tp=8/20μs) | VC |  |  | 19 | V | tp=8/20μs, IPP=1A | 3 |
| Clamping voltage (tp=8/20μs) | VC |  |  | 27 | V | tp=8/20μs, IPP=18A | 3 |
| Reverse Stand-Off Voltage | VRWM |  |  | 12 | V |  | 3 |
| Off state junction capacitance | CJ |  | 100 |  | pF | 0Vdc, f=1MHz, between I/O pins and GND | 3 |

## CAD (KiCad official)

- Symbol: `SET23A12L02-E18`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `set23a12l02-e18-etched.step` / `set23a12l02-e18-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `set23a12l02-e18.step` / `set23a12l02-e18.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/8755880415515021312) (8 pp, sha256 `3515d98fedc61871`, retrieved 2026-10-18, 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/set23a12l02-e18-datasheet.pdf)