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SN74LS257BN

Public Made by Adom

by adom

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

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docs Publish 0.1.0 · Ray 6d ago
viewers sn74ls257bn: viewers · Ray 6d ago
package.json Publish 0.1.0 · Ray 6d ago
page.json Set visibility: public · Ray 6d ago
README.md Publish 0.1.0 · Ray 6d ago
sn74ls257bn-etched.glb Publish 0.1.0 · Ray 6d ago
sn74ls257bn-etched.step sn74ls257bn: factory component page (tier=lcsc) · Ray 6d ago
sn74ls257bn-hero.glb sn74ls257bn: hero GLB from the etched model (keeps the MPN mark) · Ray 6d ago
sn74ls257bn-hero.overlay.json Publish 0.1.0 · Ray 6d ago
sn74ls257bn.glb Publish 0.1.0 · Ray 6d ago
sn74ls257bn.kicad_mod Publish 0.1.0 · Ray 6d ago
sn74ls257bn.kicad_sym Publish 0.1.0 · Ray 6d ago
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SN74LS257BN

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

SN74LS257BN from Texas Instruments, in a PDIP-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 that chooses the A data inputs when low or the B data inputs when high for all four multiplexers.
2 1A input Data input A of multiplexer 1, passed to 1Y when A/B is low.
3 1B input Data input B of multiplexer 1, passed to 1Y when A/B is high.
4 1Y tri_state 3-state output of multiplexer 1, high impedance when G is high.
5 2A input Data input A of multiplexer 2, passed to 2Y when A/B is low.
6 2B input Data input B of multiplexer 2, passed to 2Y when A/B is high.
7 2Y tri_state 3-state output of multiplexer 2, high impedance when G is high.
8 GND power_in Ground.
9 3Y tri_state 3-state output of multiplexer 3, high impedance when G is high.
10 3B input Data input B of multiplexer 3, passed to 3Y when A/B is high.
11 3A input Data input A of multiplexer 3, passed to 3Y when A/B is low.
12 4Y tri_state 3-state output of multiplexer 4, high impedance when G is high.
13 4B input Data input B of multiplexer 4, passed to 4Y when A/B is high.
14 4A input Data input A of multiplexer 4, passed to 4Y when A/B is low.
15 G input Active-low output control; a high level puts all four outputs in the high-impedance state.
16 VCC power_in Positive supply voltage.

Key specifications

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

CAD (KiCad official)

  • Symbol: SN74LS257BN
  • Footprint: Package_DIP:DIP-16_W7.62mm
  • 3D model: PDIP-16 (KiCad packages3D, STEP)
  • 3D model files: sn74ls257bn-etched.step / sn74ls257bn-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74ls257bn.step / sn74ls257bn.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (24 pp, sha256 e97f63b00f996504, retrieved 2026-10-16, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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