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 downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`fsw3820yqfn32g.step`	76 KB	You want the bare part, or you mark your own boards.
`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 (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