# SRV05-4LA 4A

**DOWO** · ESD And Surge Protection (TVS/ESD) · SOT-23-6L

SRV05-4LA 4A from DOWO, in a SOT-23-6L. 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 | ESD-protected I/O line steered to GND/Vcc by diodes; I/O-to-GND capacitance 0.5pF typ., 0.8pF max, with working voltage 5V. |
| 2 | GND | power_in | Ground reference pin of the TVS array, connected to the central Zener diode and the lower steering diodes. |
| 3 | I/O2 | passive | ESD-protected I/O line steered to GND/Vcc by diodes; I/O-to-GND capacitance 0.5pF typ., 0.8pF max, with working voltage 5V. |
| 4 | I/O3 | passive | ESD-protected I/O line steered to GND/Vcc by diodes; I/O-to-GND capacitance 0.5pF typ., 0.8pF max, with working voltage 5V. |
| 5 | Vcc | power_in | Positive rail of the TVS array connected to the upper steering diodes and the Zener cathode; reverse stand-off voltage 5V. |
| 6 | I/O4 | passive | ESD-protected I/O line steered to GND/Vcc by diodes; I/O-to-GND capacitance 0.5pF typ., 0.8pF max, with working voltage 5V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | DOWO |
| Package | SOT-23-6L |
| Category | Circuit Protection |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `SRV05-4LA 4A`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6L (KiCad packages3D, STEP)
- 3D model files: `srv05-4la-4a-etched.step` / `srv05-4la-4a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `srv05-4la-4a.step` / `srv05-4la-4a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [DOWO datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589040369916502016) (4 pp, sha256 `c8ad3cb46de59976`, retrieved 2026-10-09, 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/srv05-4la-4a-datasheet.pdf)