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SN74HCT257DR

Public Made by Adom

by adom

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

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Symbol & Footprint

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Datasheet

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Contents

README

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SN74HCT257DR

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

SN74HCT257DR from Texas Instruments, in a SOP-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 Address select
2 1A input Channel 1, data input A
3 1B input Channel 1, data input B
4 1Y tri_state Channel 1, data output
5 2A input Channel 2, data input A
6 2B input Channel 2, data input B
7 2Y tri_state Channel 2, data output
8 GND power_in Ground
9 3Y tri_state Channel 3, data output
10 3B input Channel 3, data input B
11 3A input Channel 3, data input A
12 4Y tri_state Channel 4, data output
13 4B input Channel 4, data input B
14 4A input Channel 4, data input A
15 G input Output strobe, active low
16 VCC power_in Positive supply

Key specifications

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

CAD (KiCad official)

  • Symbol: SN74HCT257DR
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOP-16 (KiCad packages3D, STEP)
  • 3D model files: sn74hct257dr-etched.step / sn74hct257dr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74hct257dr.step / sn74hct257dr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (20 pp, sha256 4ff83c0fdce1bb70, retrieved 2026-09-27, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-4-6 (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