SN74LVC2G66DCUR from Texas Instruments, in a VSSOP-8-0.5mm. 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	1A	bidirectional	Switch 1 bidirectional analog/digital signal terminal A. Signals up to 5.5 V peak can be passed between 1A and 1B when switch 1 is enabled (1C = H). Rail-to-rail input/output.
2	1B	bidirectional	Switch 1 bidirectional analog/digital signal terminal B. Signals up to 5.5 V peak can be passed between 1A and 1B when switch 1 is enabled (1C = H).
3	1C	input	Switch 1 enable control input. L = switch OFF (1A/1B isolated); H = switch ON (1A/1B connected). Referenced to VCC; VIH ≈ VCC × 0.7 at VCC ≥ 2.3 V.
4	GND	power_in	Ground reference for the device.
5	2A	bidirectional	Switch 2 bidirectional analog/digital signal terminal A. Signals up to 5.5 V peak can be passed between 2A and 2B when switch 2 is enabled (2C = H).
6	2B	bidirectional	Switch 2 bidirectional analog/digital signal terminal B. Signals up to 5.5 V peak can be passed between 2A and 2B when switch 2 is enabled (2C = H).
7	2C	input	Switch 2 enable control input. L = switch OFF (2A/2B isolated); H = switch ON (2A/2B connected).
8	VCC	power_in	Positive supply input, 1.65 V to 5.5 V. Bypass locally with a 0.1 µF ceramic capacitor to GND.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	VSSOP-8-0.5mm
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

SN74LVC2G66DCUR
SN74LVC2G66DCURDCT
SN74LVC2G66DCURDCTR
SN74LVC2G66DCURYZP
SN74LVC2G66DCURYZPR

CAD (KiCad official)

Symbol: SN74LVC2G66DCUR
Footprint: Package_SO:VSSOP-8_2.3x2mm_P0.5mm
3D model: VSSOP-8-0.5mm (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sn74lvc2g66dcur.step`	122 KB	You want the bare part, or you mark your own boards.
`sn74lvc2g66dcur-etched.step`	2.9 MB	You want the part with `SN74LVC2G66DCUR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 701 faces against 147 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 (29 pp, sha256 dd5515827c66a656, 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