# ASH05E2U

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

ASH05E2U from SCME, 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 | IO | bidirectional | I/O line connection (connect to IO); for ASH05E2U the working voltage VRWM is 5 V max and peak pulse power is 350 W at tp=8/20µs, and pins 1 and 2 can be used together as a bidirectional suppressor. |
| 2 | IO | bidirectional | I/O line connection (connect to IO); for ASH05E2U the working voltage VRWM is 5 V max, and this pin is used with pin 1 when the device is operated as a bidirectional suppressor. |
| 3 | GND | power_in | Ground connection (connect to GND) that serves as the common return for the TVS array. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | SCME |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse stand-off voltage | VRWM |  |  | 5 | V |  | 3 |
| Breakdown voltage | VBR | 6 |  |  | V |  | 3 |
| Clamping voltage at 1A | VCL |  |  | 9 | V | I=1A | 3 |
| Peak pulse current | IPP |  |  | 15 | A |  | 3 |
| Clamping voltage at IPP | VCL |  |  | 18 | V | I=IPP | 3 |
| Reverse leakage current | IR |  |  | 1 | uA |  | 3 |
| Peak pulse power (tp=8/20us) | Ppk |  |  | 350 | W | @25°C, tp=8/20us | 2 |
| ESD (IEC61000-4-2 air discharge) | VESD | -30 |  | 30 | kV | @25°C | 2 |
| ESD (IEC61000-4-2 contact discharge) | VESD | -30 |  | 30 | kV | @25°C | 2 |
| Junction temperature | TJ |  |  | 125 | °C |  | 2 |
| Operating temperature | TOP | -40 |  | 125 | °C |  | 2 |
| Storage temperature | TSTG | -55 |  | 150 | °C |  | 2 |
| Lead temperature | TL |  |  | 260 | °C |  | 2 |
| Typical capacitance | CJ |  | 180 |  | pF |  | 3 |

## CAD (KiCad official)

- Symbol: `ASH05E2U`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ash05e2u-etched.step` / `ash05e2u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ash05e2u.step` / `ash05e2u.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [SCME datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603003432127655936) (7 pp, sha256 `8d9fdda5376b863f`, retrieved 2026-10-19, 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/ash05e2u-datasheet.pdf)