# SI4401BDY-T1-GE3

**Vishay Intertech** · MOSFETs · SO-8

SI4401BDY-T1-GE3 from Vishay Intertech, in a SO-8. 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 | S | passive | Source terminal of the P-channel MOSFET, tied to pins 2 and 3. |
| 2 | S | passive | Source terminal of the P-channel MOSFET, tied to pins 1 and 3. |
| 3 | S | passive | Source terminal of the P-channel MOSFET, tied to pins 1 and 2. |
| 4 | G | passive | Gate terminal with gate-source voltage rated at ±20 V maximum and a threshold of -1.0 V to -3.0 V. |
| 5 | D | passive | Drain terminal of the P-channel MOSFET, tied to pins 6, 7 and 8, with drain-source voltage rated at -40 V. |
| 6 | D | passive | Drain terminal of the P-channel MOSFET, tied to pins 5, 7 and 8, with drain-source voltage rated at -40 V. |
| 7 | D | passive | Drain terminal of the P-channel MOSFET, tied to pins 5, 6 and 8, with drain-source voltage rated at -40 V. |
| 8 | D | passive | Drain terminal of the P-channel MOSFET, tied to pins 5, 6 and 7, with drain-source voltage rated at -40 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Vishay Intertech |
| Package | SO-8 |
| Category | Transistors |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `SI4401BDY-T1-GE3`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `si4401bdy-t1-ge3-etched.step` / `si4401bdy-t1-ge3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `si4401bdy-t1-ge3.step` / `si4401bdy-t1-ge3.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Vishay Intertech datasheet](docs/si4401bdy-t1-ge3-datasheet.pdf) (8 pp, sha256 `d09679712b3dadb1`, retrieved 2026-10-27, tier: manufacturer)
- **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/si4401bdy-t1-ge3-datasheet.pdf)