FSW6820YQFN40G from Full Way, in a QFN-40L-EP(5x5). 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	EN1	input	Enable pin, active low. Controls channels 1 (Super Speed port A/B/C signals). Internal 2 MOhm pull-up resistor. When high, device is in shutdown/power-down.
2	SEL1	input	Select pin. Along with SEL2 selects which of the 4 differential channels is routed to COM. Internal 2 MOhm pull-down resistor.
3	COMAN	bidirectional	Negative differential signal 1 for USB 3.1 port COM. Common port A negative, connects to selected DA1N/DB1N/DC1N.
4	COMAP	bidirectional	Positive differential signal 1 for USB 3.1 port COM. Common port A positive, connects to selected DA1P/DB1P/DC1P.
5	COMBN	bidirectional	Negative differential signal 2 for USB 3.1 port COM. Common port B negative.
6	COMBP	bidirectional	Positive differential signal 2 for USB 3.1 port COM. Common port B positive.
7	COMCN	bidirectional	Negative differential signal 3 for USB 2.0 port COM. Common port C (USB 2.0 DM) negative.
8	COMCP	bidirectional	Positive differential signal 3 for USB 2.0 port COM. Common port C (USB 2.0 DP) positive.
9	DC4N	bidirectional	Negative differential signal 4 for USB 2.0 port C. Channel 4 USB 2.0 DM.
10	DC4P	bidirectional	Positive differential signal 4 for USB 2.0 port C. Channel 4 USB 2.0 DP.
11	DC3N	bidirectional	Negative differential signal 3 for USB 2.0 port C. Channel 3 USB 2.0 DM.
12	DC3P	bidirectional	Positive differential signal 3 for USB 2.0 port C. Channel 3 USB 2.0 DP.
13	VCC	power_in	Positive supply voltage. Operating range 1.8V to 4.5V (typical 3V). Absolute max -0.5V to +5.5V.
14	EN3	input	Enable pin, active low. Internal 2 MOhm pull-up resistor. When high, device is in shutdown/power-down.
15	DB4P	bidirectional	Positive differential signal 4 for USB 3.1 port B. Channel 4 SuperSpeed port B positive.
16	DB4N	bidirectional	Negative differential signal 4 for USB 3.1 port B. Channel 4 SuperSpeed port B negative.
17	DA4P	bidirectional	Positive differential signal 4 for USB 3.1 port A. Channel 4 SuperSpeed port A positive.
18	DA4N	bidirectional	Negative differential signal 4 for USB 3.1 port A. Channel 4 SuperSpeed port A negative.
19	DB3P	bidirectional	Positive differential signal 3 for USB 3.1 port B.
20	DB3N	bidirectional	Negative differential signal 3 for USB 3.1 port B.
21	DA3P	bidirectional	Positive differential signal 3 for USB 3.1 port A.
22	DA3N	bidirectional	Negative differential signal 3 for USB 3.1 port A.
23	DB2P	bidirectional	Positive differential signal 2 for USB 3.1 port B.
24	DB2N	bidirectional	Negative differential signal 2 for USB 3.1 port B.
25	DA2P	bidirectional	Positive differential signal 2 for USB 3.1 port A.
26	DA2N	bidirectional	Negative differential signal 2 for USB 3.1 port A.
27	VCC	power_in	Positive supply voltage. Operating range 1.8V to 4.5V (typical 3V).
28	GND	power_in	Power ground reference.
29	DC2P	bidirectional	Positive differential signal 2 for USB 2.0 port C. Channel 2 USB 2.0 DP.
30	DC2N	bidirectional	Negative differential signal 2 for USB 2.0 port C. Channel 2 USB 2.0 DM.
31	DC1P	bidirectional	Positive differential signal 1 for USB 2.0 port C. Channel 1 USB 2.0 DP.
32	DC1N	bidirectional	Negative differential signal 1 for USB 2.0 port C. Channel 1 USB 2.0 DM.
33	DB1P	bidirectional	Positive differential signal 1 for USB 3.1 port B.
34	DB1N	bidirectional	Negative differential signal 1 for USB 3.1 port B.
35	DA1P	bidirectional	Positive differential signal 1 for USB 3.1 port A.
36	DA1N	bidirectional	Negative differential signal 1 for USB 3.1 port A.
37	EN2	input	Enable pin, active low. Internal 2 MOhm pull-up resistor. When high, device is in shutdown/power-down.
38	SEL2	input	Select pin. Along with SEL1 selects which of the 4 differential channels is routed to COM. Internal 2 MOhm pull-down resistor.
39	VCC	power_in	Positive supply voltage. Operating range 1.8V to 4.5V (typical 3V).
40	GND	power_in	Power ground reference.

Key specifications

Parameter	Value
Manufacturer	Full Way
Package	QFN-40L-EP(5x5)
Category	Interface
Pins	40

Ordering variants

Same part, different packaging or reel option.

FSW6820YQFN40G/TR

CAD (KiCad official)

Symbol: FSW6820YQFN40G
Footprint: Package_DFN_QFN:QFN-40-1EP_5x5mm_P0.4mm_EP3.6x3.6mm
3D model: QFN-40L-EP(5x5) (KiCad packages3D, STEP)

Provenance

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

Datasheet: Full Way datasheet (12 pp, sha256 49d9fe9fd81f9432, 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