74HC155 (Dual 2-to-4-line Decoders/demultiplexers)

Overview

The 74HC155 is a high-speed dual 2-to-4-line decoder/demultiplexer from the 74HC series, designed for digital logic applications. Each of its two independent sections can decode a 2-bit binary input into one of four active-low outputs, or function as a 1-to-4 demultiplexer. With its compact design and reliable performance, the 74HC155 is a versatile building block for address decoding, signal routing, and logic expansion in embedded systems.

Key Features

• Dual 2-to-4-line decoder/demultiplexer – Two independent sections in a single IC, saving board space.
• Active-low outputs – Suitable for driving active-low logic and enabling buses.
• Enable inputs – Each section has an active-low enable (E) and a data input (D) for demultiplexing.
• High-speed CMOS technology – Low power consumption and fast propagation delays.
• Wide operating voltage range – Compatible with 2V to 6V supplies, making it ideal for 3.3V and 5V systems.
• Standard 74HC logic levels – Easily interfaces with other 74HC/HCT series ICs and microcontrollers.

Technical Specifications

• Logic Family: 74HC (High-Speed CMOS)
• Type: Dual 2-to-4-line decoder/demultiplexer
• Number of Circuits: 2
• Output Type: Active-low (inverting)
• Supply Voltage Range: 2V to 6V
• High-Level Output Current (IOH): 5.2mA
• Low-Level Output Current (IOL): 5.2mA
• Propagation Delay: Typically 15ns (at 5V, CL=50pF)
• Operating Temperature Range: -40°C to +85°C
• Package Options: DIP-16, SOIC-16 (as available)

Applications & Use Cases

• Address decoding in memory and peripheral selection.
• Demultiplexing serial data to parallel output lines.
• Signal routing in digital systems and test equipment.
• Logic function generation for combinational circuits.
• Educational projects in digital electronics labs.
• Interfacing microcontrollers to multiple peripherals or displays.

What's Included

• 1x 74HC155 Dual 2-to-4-line Decoder/Demultiplexer IC
• (Package may vary; please check product photos)

Compatibility

• Works with Arduino, Raspberry Pi, STMicroelectronics, PIC, and other microcontrollers operating at 3.3V or 5V.
• Can be used with other 74HC series logic ICs for complex digital designs.
• Standard DIP/SOIC pinout for breadboard and PCB prototyping.

MOKWN Recommendation

For Egyptian makers and engineers, the 74HC155 is an essential IC for expanding digital outputs and implementing address decoding. Its dual design offers flexibility and efficiency, making it a valuable addition to any electronics lab. We recommend pairing it with our range of breadboards, jumper wires, and power supplies for a complete prototyping experience. Order now and elevate your digital logic projects!