SN74LVC2G66DCTR from Texas Instruments, in a MSOP-8. 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, side A. Bidirectional analog/digital signal terminal of switch 1. Connected to 1B when control input 1C is high. On-resistance ~6 Ω at VCC=4.5 V.
2	1B	bidirectional	Switch 1, side B. Bidirectional analog/digital signal terminal of switch 1. Connected to 1A when 1C is high.
3	2C	input	Control input for switch 2. L = switch OFF (2A disconnected from 2B), H = switch ON. Logic input referenced to VCC/GND per VIH/VIL thresholds.
4	GND	power_in	Ground reference for the device.
5	2A	bidirectional	Switch 2, side A. Bidirectional analog/digital signal terminal of switch 2. Connected to 2B when control input 2C is high.
6	2B	bidirectional	Switch 2, side B. Bidirectional analog/digital signal terminal of switch 2. Connected to 2A when 2C is high.
7	1C	input	Control input for switch 1. L = switch OFF (1A disconnected from 1B), H = switch ON. Logic input referenced to VCC/GND per VIH/VIL thresholds.
8	VCC	power_in	Positive supply, 1.65 V to 5.5 V. Bypass with a 0.1 µF ceramic capacitor to GND close to the pin.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	MSOP-8
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

SN74LVC2G66DCTR
SN74LVC2G66DCTRDCUR
SN74LVC2G66DCTRDCU
SN74LVC2G66DCTRYZPR
SN74LVC2G66DCTRYZP

CAD (KiCad official)

Symbol: SN74LVC2G66DCTR
Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
3D model: MSOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sn74lvc2g66dctr.step`	123 KB	You want the bare part, or you mark your own boards.
`sn74lvc2g66dctr-etched.step`	2.8 MB	You want the part with `SN74LVC2G66DCTR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 673 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 (31 pp, sha256 e8e74bd659dd8c6b, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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