# SRV05-4HTG-D

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

SRV05-4HTG-D from Littelfuse, in a SOT-23-6. 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/O 1 | passive | ESD/surge-protected I/O channel 1 with rail-to-rail steering diodes, about 1pF typical capacitance to GND. |
| 2 | GND | power_in | Ground reference for the TVS array; I/O pins are clamped to GND (breakdown 6V min at 1mA, 8.5V max). |
| 3 | I/O 2 | passive | ESD/surge-protected I/O channel 2 with rail-to-rail steering diodes, about 1pF typical capacitance to GND. |
| 4 | I/O 3 | passive | ESD/surge-protected I/O channel 3 with rail-to-rail steering diodes, about 1pF typical capacitance to GND. |
| 5 | VCC | power_in | Positive rail of the steering diodes, connected to the supply or protected rail; reverse standoff voltage is 6V. |
| 6 | I/O 4 | passive | ESD/surge-protected I/O channel 4 with rail-to-rail steering diodes, about 1pF typical capacitance to GND. |

## Key specifications

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

## CAD (KiCad official)

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

## Provenance

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

- **Datasheet:** [Littelfuse datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588938557917941760) (5 pp, sha256 `c78cbb399534491d`, 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/srv05-4htg-d-datasheet.pdf)