cd4512 8-channel multiplexer (MUX)

Description

The CD4512B is a hobbyist’s multi-tool for digital logic, acting as an 8-channel data selector that lets you route signals with surgical precision. Think of it as a smart 8-way switch: you can feed in eight different digital inputs and use three binary select lines to choose exactly which one reaches the output. What sets this chip apart for DIY makers is its "three-state" (Tri-state) output capability. This feature allows you to disconnect the chip from a shared data bus entirely, preventing signal conflicts when multiple devices are connected to the same line. Whether you are building a custom retro-computer, managing multiple sensor inputs, or designing a complex LED matrix controller, this through-hole IC is breadboard-ready and incredibly resilient to varying voltage levels.

Features

• 3-state output

• Standardized, symmetrical output characteristics

• 100% tested for quiescent current at 20 V

• 5-V, 10-V, and 15-V parametric ratings

• Maximum input current of 1 µA at 18 V over full package-temperature range; 100 nA at 18 V and 25°C

• Noise margin (over full package-temperature range):

  • 1 V at VDD = 5 V

  • 2 V at VDD = 10 V

  • 2.5 V at VDD = 15 V

• Meets all requirements of JEDEC Tentative Standard No. 13B, “Standard Specifications for Description of ‘B’ Series CMOS Devices”

Applications

• Digital multiplexing

• Number-sequence generation

• Signal gating