U74LVC1G157G from UTC Unisonic Tech, in a SOT-363. 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	I1	input	Data input 1. Routed to output Y when select S=H. CMOS logic input, VIH/VIL scale with VCC (1.65V-5.5V).
2	GND	power_in	Ground reference (0V).
3	I0	input	Data input 0. Routed to output Y when select S=L. CMOS logic input, VIH/VIL scale with VCC (1.65V-5.5V).
4	Y	output	Multiplexer output. Drives ±24mA at VCC=3.0V (up to ±32mA at VCC=4.5V). Output = I0 when S=L, output = I1 when S=H.
5	VCC	power_in	Positive supply voltage, 1.65V to 5.5V (operating). Absolute max -0.5V to +6.5V. Quiescent current ICC ≤ 10μA.
6	S	input	Data select input. S=L selects I0 to output Y; S=H selects I1 to output Y. CMOS logic input.

Key specifications

Parameter	Value
Manufacturer	UTC Unisonic Tech
Package	SOT-363
Category	Interface
Pins	6

Ordering variants

Same part, different packaging or reel option.

U74LVC1G157GAG6
U74LVC1G157GAL6

CAD (KiCad official)

Symbol: U74LVC1G157G
Footprint: Package_TO_SOT_SMD:SOT-363_SC-70-6
3D model: SOT-363 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: UTC Unisonic Tech datasheet (5 pp, sha256 0b32c07d4d4a1f4a, 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