# FSW3820YQFN32G

**Full Way** · Analog Switches, Multiplexers · QFN-32L-EP(4x4)

FSW3820YQFN32G from Full Way, in a QFN-32L-EP(4x4). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | D0+ | bidirectional | Positive differential signal 0 for COM port. |
| 2 | D0- | bidirectional | Negative differential signal 0 for COM port. |
| 3 | D1+ | bidirectional | Positive differential signal 1 for COM port. |
| 4 | D1- | bidirectional | Negative differential signal 1 for COM port. |
| 5 | SEL | input | Channel select pin. Low routes COM to Port A, High routes COM to Port B. Internal 2 MΩ pull-down. VIH ≥ 1.6 V, VIL ≤ 0.4 V. |
| 6 | _EN | input | Active-low enable. When High, all channels are Hi-Z (shutdown, ~1 µA). Internal 2 MΩ pull-up. |
| 7 | D2+ | bidirectional | Positive differential signal 2 for COM port. |
| 8 | D2- | bidirectional | Negative differential signal 2 for COM port. |
| 9 | NC | unconnected | Not connected. |
| 10 | D3+ | bidirectional | Positive differential signal 3 for COM port. |
| 11 | D3- | bidirectional | Negative differential signal 3 for COM port. |
| 12 | NC | unconnected | Not connected. |
| 13 | NC | unconnected | Not connected. |
| 14 | GND | power_in | Power ground return. |
| 15 | VCC | power_in | Positive supply voltage. Operating range 1.8 V to 4.5 V. Quiescent current ~28 µA (max); power-down ~1 µA. |
| 16 | NC | unconnected | Not connected. |
| 17 | D3-B | bidirectional | Negative differential signal 3 for Port B. |
| 18 | D3+B | bidirectional | Positive differential signal 3 for Port B. |
| 19 | D2-B | bidirectional | Negative differential signal 2 for Port B. |
| 20 | D2+B | bidirectional | Positive differential signal 2 for Port B. |
| 21 | D1-B | bidirectional | Negative differential signal 1 for Port B. |
| 22 | D1+B | bidirectional | Positive differential signal 1 for Port B. |
| 23 | D0-B | bidirectional | Negative differential signal 0 for Port B. |
| 24 | D0+B | bidirectional | Positive differential signal 0 for Port B. |
| 25 | D3-A | bidirectional | Negative differential signal 3 for Port A. |
| 26 | D3+A | bidirectional | Positive differential signal 3 for Port A. |
| 27 | D2-A | bidirectional | Negative differential signal 2 for Port A. |
| 28 | D2+A | bidirectional | Positive differential signal 2 for Port A. |
| 29 | D1-A | bidirectional | Negative differential signal 1 for Port A. |
| 30 | D1+A | bidirectional | Positive differential signal 1 for Port A. |
| 31 | D0-A | bidirectional | Negative differential signal 0 for Port A. |
| 32 | D0+A | bidirectional | Positive differential signal 0 for Port A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Full Way |
| Package | QFN-32L-EP(4x4) |
| Category | Interface |
| Pins | 32 |

## Ordering variants

Same part, different packaging or reel option.

- `FSW3820YQFN32G/TR`

## CAD (KiCad official)

- Symbol: `FSW3820YQFN32G`
- Footprint: `Package_DFN_QFN:QFN-32-1EP_4x4mm_P0.4mm_EP2.9x2.9mm`
- 3D model: QFN-32L-EP(4x4) (KiCad packages3D, STEP)
- 3D model files: `fsw3820yqfn32g-etched.step` / `fsw3820yqfn32g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fsw3820yqfn32g.step` / `fsw3820yqfn32g.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`fsw3820yqfn32g.step`](fsw3820yqfn32g.step) | 76 KB | You want the bare part, or you mark your own boards. |
| [`fsw3820yqfn32g-etched.step`](fsw3820yqfn32g-etched.step) | 2.6 MB | You want the part with `FSW3820YQFN32G` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 613 faces against 72 in the bare model. It
survives export, section views, and rendering in any CAD tool, and it drops straight
into KiCad or Fusion with no extra setup.

## Provenance

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

- **Datasheet:** [Full Way datasheet](docs/fsw3820yqfn32g-datasheet.pdf) (10 pp, sha256 `994988cdf5c79c49`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/fsw3820yqfn32g-datasheet.pdf)