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SN74F257DR

Public Made by Adom

by adom

Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74F257DR

Texas Instruments · Signal Switches, Multiplexers, Decoders · SOIC-16

SN74F257DR from Texas Instruments, in a SOIC-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 Multiplexer select input; when low selects A inputs, when high selects B inputs.
2 1A input Channel 1 data input A of 2-to-1 multiplexer.
3 1B input Channel 1 data input B of 2-to-1 multiplexer.
4 1Y tri_state Channel 1 3-state output; high-impedance when OE is high, driven when OE is low.
5 2A input Channel 2 data input A of 2-to-1 multiplexer.
6 2B input Channel 2 data input B of 2-to-1 multiplexer.
7 2Y tri_state Channel 2 3-state output; high-impedance when OE is high, driven when OE is low.
8 GND power_in Ground reference voltage.
9 3Y tri_state Channel 3 3-state output; high-impedance when OE is high, driven when OE is low.
10 3B input Channel 3 data input B of 2-to-1 multiplexer.
11 3A input Channel 3 data input A of 2-to-1 multiplexer.
12 4Y tri_state Channel 4 3-state output; high-impedance when OE is high, driven when OE is low.
13 4B input Channel 4 data input B of 2-to-1 multiplexer.
14 4A input Channel 4 data input A of 2-to-1 multiplexer.
15 OE input Output Enable input (active low); outputs are high-impedance when OE is high.
16 VCC power_in Positive supply voltage; rated 4.5 V to 5.5 V per recommended operating conditions.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-16
Category Logic
Pins 16

CAD (KiCad official)

  • Symbol: SN74F257DR
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOIC-16 (KiCad packages3D, STEP)
  • 3D model files: sn74f257dr-etched.step / sn74f257dr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74f257dr.step / sn74f257dr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (15 pp, sha256 35ca05635a769cd5, retrieved 2026-10-06, tier: manufacturer)
  • 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