SN74LVC1G66DBVR from UMW, in a SOT-23-5. 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	A	bidirectional	Bidirectional analog/digital switch terminal A. Connected to terminal B when control C is high. Signal amplitude up to 5.5 V(peak), VIO range 0 to VCC.
2	B	bidirectional	Bidirectional analog/digital switch terminal B. Connected to terminal A when control C is high. Signal amplitude up to 5.5 V(peak), VIO range 0 to VCC.
3	GND	power_in	Ground reference for the device. All voltages are referenced to this pin.
4	C	input	Digital control input for the switch. L = switch OFF (A disconnected from B); H = switch ON. VIH threshold ~0.65×VCC to 0.7×VCC depending on VCC; input voltage range 0 to 5.5 V (accepts inputs above VCC).
5	VCC	power_in	Supply voltage input. Recommended operating range 1.65 V to 5.5 V; absolute maximum 6.5 V. Bypass with a local 0.1 µF ceramic capacitor to GND.

Key specifications

Parameter	Value
Manufacturer	UMW
Package	SOT-23-5
Category	Comm/UART
Pins	5

Ordering variants

Same part, different packaging or reel option.

SN74LVC1G66DBVR
SN74LVC1G66DBVRDCKR
SN74LVC1G66DBVRDRLR
SN74LVC1G66DBVRDRYR
SN74LVC1G66DBVRDSFR
SN74LVC1G66DBVRYZPR

CAD (KiCad official)

Symbol: SN74LVC1G66DBVR
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sn74lvc1g66dbvr.step`	85 KB	You want the bare part, or you mark your own boards.
`sn74lvc1g66dbvr-etched.step`	2.3 MB	You want the part with `SN74LVC1G66DBVR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 586 faces against 102 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: UMW datasheet (24 pp, sha256 673f1c8c93aa0132, 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