# U74LVC1G157G

**UTC Unisonic Tech** · Analog Switches, Multiplexers · SOT-363

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)
- 3D model files: `u74lvc1g157g-etched.step` / `u74lvc1g157g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `u74lvc1g157g.step` / `u74lvc1g157g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UTC Unisonic Tech datasheet](docs/u74lvc1g157g-datasheet.pdf) (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](docs/u74lvc1g157g-datasheet.pdf)