FSW3157YSOT236G from Full Way, in a SOT-23-6. 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	B1	bidirectional	Analog/Digital signal port (Normally open throw). Bidirectional switch terminal; connected to common port A when SEL=1. On-resistance 1.5Ω typical, ±100mA continuous current.
2	GND	power_in	Ground reference for the device.
3	B0	bidirectional	Analog/Digital signal port (Normally closed throw). Bidirectional switch terminal; connected to common port A when SEL=0. On-resistance 1.5Ω typical, ±100mA continuous current.
4	A	bidirectional	Common signal port of the SPDT switch. Connects to B0 when SEL=0 and to B1 when SEL=1. Overrides VCC to achieve true isolation even when supply is dead.
5	VCC	power_in	Single power supply input, 1.5V to 5.5V operating range (absolute max 6.5V). Quiescent current <2µA typical. Bypass with 0.1µF to GND.
6	SEL	input	Logic input control selecting which B port connects to A. SEL=0 → B0=A; SEL=1 → B1=A. 1.8V logic compatible: VIH=1.6V (VCC=3.3-5.5V) or 1.4V (VCC=1.5-3.3V); VIL=0.6V or 0.4V respectively.

Key specifications

Parameter	Value
Manufacturer	Full Way
Package	SOT-23-6
Category	Interface
Pins	6

Ordering variants

Same part, different packaging or reel option.

FSW3157YSOT236G/TR
FSW3157YSOT363G/TR

CAD (KiCad official)

Symbol: FSW3157YSOT236G
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`fsw3157ysot236g.step`	97 KB	You want the bare part, or you mark your own boards.
`fsw3157ysot236g-etched.step`	2.9 MB	You want the part with `FSW3157YSOT236G` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 685 faces against 117 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 (9 pp, sha256 da4a63e1a12b4e73, 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