SN74LVC1G3157DCKR from Texas Instruments, in a SC-70-6(SOT-363). 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	B2	bidirectional	Switch I/O terminal 2. Connected to common A when S is driven high. Bidirectional analog/digital signal path, 0 V to VCC signal range.
2	GND	power_in	Ground reference (0 V).
3	B1	bidirectional	Switch I/O terminal 1. Connected to common A when S is driven low. Bidirectional analog/digital signal path, 0 V to VCC signal range.
4	A	bidirectional	Common terminal of the SPDT switch. Routes to B1 when S=0 and to B2 when S=1. Bidirectional analog/digital signal path.
5	VCC	power_in	Supply voltage input. DCK (SC70) package: 1.65 V to 5.5 V recommended (absolute max 6 V). Decouple locally to GND.
6	S	input	Select control input. S=low connects A to B1; S=high connects A to B2. CMOS input referenced to VCC (VIH ≈ 0.7·VCC to 0.75·VCC). Must not be left floating.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SC-70-6(SOT-363)
Category	Interface
Pins	6

Ordering variants

Same part, different packaging or reel option.

SN74LVC1G3157DCKR
SN74LVC1G3157DCKRDCKT
SN74LVC1G3157DCKRDBVR
SN74LVC1G3157DCKRDBVT
SN74LVC1G3157DCKRDRLR
SN74LVC1G3157DCKRDRYR
SN74LVC1G3157DCKRDSFR
SN74LVC1G3157DCKRDTBR
SN74LVC1G3157DCKRYZPR

CAD (KiCad official)

Symbol: SN74LVC1G3157DCKR
Footprint: Package_TO_SOT_SMD:SOT-363_SC-70-6
3D model: SC-70-6(SOT-363) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sn74lvc1g3157dckr.step`	99 KB	You want the bare part, or you mark your own boards.
`sn74lvc1g3157dckr-etched.step`	2.7 MB	You want the part with `SN74LVC1G3157DCKR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 677 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: Texas Instruments datasheet (56 pp, sha256 2a39b0f597c54e20, retrieved 2026-08-17, tier: manufacturer)
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