SN74LVC1G3157DBVR from Texas Instruments, 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 switch port B1. Connected to common port A when Select = H. Signal range 0 V to VCC; low on-resistance (~7 Ω typ at VCC=4.5 V).
2	GND	power_in	Ground reference (0 V). Negative analog signal rail; all signal voltages referenced to this pin.
3	B0	bidirectional	Analog switch port B0. Connected to common port A when Select = L. Signal range 0 V to VCC; low on-resistance (~7 Ω typ at VCC=4.5 V).
4	A	bidirectional	Common analog switch port. Routed to B0 (Select=L) or B1 (Select=H). Signal range 0 V to VCC; bidirectional pass-transistor path.
5	VCC	power_in	Positive supply voltage, 1.65 V to 5.5 V. Sets the maximum analog signal range and digital logic threshold. Bypass with a local 0.1 µF ceramic capacitor to GND.
6	Select	input	Digital control input selecting the analog signal path: L routes B0↔A, H routes B1↔A. Over-voltage tolerant up to 7 V independent of VCC. Must not be left floating.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOT-23-6
Category	Interface
Pins	6

Ordering variants

Same part, different packaging or reel option.

SN74LVC1G3157DBVR
SN74LVC1G3157DBVRDCKR
SN74LVC1G3157DBVRY

CAD (KiCad official)

Symbol: SN74LVC1G3157DBVR
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
`sn74lvc1g3157dbvr.step`	97 KB	You want the bare part, or you mark your own boards.
`sn74lvc1g3157dbvr-etched.step`	2.5 MB	You want the part with `SN74LVC1G3157DBVR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 629 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 (15 pp, sha256 ad92497e43fe7bbc, 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