# SN74LVC257AMPWREP

**Texas Instruments** · Signal Switches, Multiplexers, Decoders · TSSOP-16

SN74LVC257AMPWREP from Texas Instruments, in a TSSOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | A/B | input | Select input for all multiplexer stages; low selects A inputs, high selects B inputs |
| 2 | 1A | input | Data input A for multiplexer stage 1 |
| 3 | 1B | input | Data input B for multiplexer stage 1 |
| 4 | 1Y | tri_state | Three-state output for multiplexer stage 1; disabled (high impedance) when OE is high |
| 5 | 2A | input | Data input A for multiplexer stage 2 |
| 6 | 2B | input | Data input B for multiplexer stage 2 |
| 7 | 2Y | tri_state | Three-state output for multiplexer stage 2; disabled (high impedance) when OE is high |
| 8 | GND | power_in | Ground (0V reference) |
| 9 | 3Y | tri_state | Three-state output for multiplexer stage 3; disabled (high impedance) when OE is high |
| 10 | 3B | input | Data input B for multiplexer stage 3 |
| 11 | 3A | input | Data input A for multiplexer stage 3 |
| 12 | 4Y | tri_state | Three-state output for multiplexer stage 4; disabled (high impedance) when OE is high |
| 13 | 4B | input | Data input B for multiplexer stage 4 |
| 14 | 4A | input | Data input A for multiplexer stage 4 |
| 15 | OE | input | Output enable control input; active-low, outputs disabled (high impedance) when high |
| 16 | VCC | power_in | Positive power supply; recommended operating voltage range 2V to 3.6V |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-16 |
| Category | Logic |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `SN74LVC257AMPWREP`
- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`
- 3D model: TSSOP-16 (KiCad packages3D, STEP)
- 3D model files: `sn74lvc257ampwrep-etched.step` / `sn74lvc257ampwrep-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74lvc257ampwrep.step` / `sn74lvc257ampwrep.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/sn74lvc257a-ep) (13 pp, sha256 `8ee0b28dc740161a`, retrieved 2026-10-07, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/sn74lvc257ampwrep-datasheet.pdf)