SN74LVC1G139DCUR 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	A	input	Address input, bit 0. CMOS-level select input; VIH from 0.65*VCC (at 1.65-1.95 V) up to 2 V (at 3-3.6 V). Input voltage tolerant to 5.5 V regardless of VCC.
2	B	input	Address input, bit 1. CMOS-level select input; VIH from 0.65*VCC (at 1.65-1.95 V) up to 2 V (at 3-3.6 V). Input voltage tolerant to 5.5 V regardless of VCC.
3	Y3	output	Decoder output 3; asserted low when B is high and A is high. Push-pull CMOS output rated for ±24 mA drive at 3.3 V.
4	GND	power_in	Ground reference (0 V).
5	Y2	output	Decoder output 2; asserted low when B is high and A is low. Push-pull CMOS output rated for ±24 mA drive at 3.3 V.
6	Y1	output	Decoder output 1; asserted low when B is low and A is high. Push-pull CMOS output rated for ±24 mA drive at 3.3 V.
7	Y0	output	Decoder output 0; asserted low when B is low and A is low. Push-pull CMOS output rated for ±24 mA drive at 3.3 V.
8	VCC	power_in	Supply voltage. Operating range 1.65 V to 5.5 V; data retention down to 1.5 V. Decouple with a 0.1 µF ceramic to GND.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SN74LVC1G139DCUR
SN74LVC1G139DCURDCT
SN74LVC1G139DCURDCTR
SN74LVC1G139DCURYZP
SN74LVC1G139DCURYZPR

CAD (KiCad official)

Symbol: SN74LVC1G139DCUR
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
`sn74lvc1g139dcur.step`	122 KB	You want the bare part, or you mark your own boards.
`sn74lvc1g139dcur-etched.step`	2.9 MB	You want the part with `SN74LVC1G139DCUR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 713 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 (25 pp, sha256 e27e598d1d356ab2, 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