Logic IC 74138
Category: ICs
₦700.00
The 74138 Logic IC is a high-speed 3-to-8 line decoder and demultiplexer IC widely used in digital electronics for address decoding, memory selection, and logic routing applications.
Key Features
3-to-8 line decoder / demultiplexer
High-speed TTL-compatible IC
Three enable inputs for flexible control
Converts 3 binary inputs to 8 active-low outputs
Ideal for memory address decoding, data routing, and logic circuits
Wide operating voltage range (4.5V – 5.5V)
Low power consumption
Standard DIP package for easy PCB integration
Detailed Description
The 74138 Logic IC is a versatile and widely used digital IC that converts 3 binary input signals into 8 mutually exclusive output lines. It features three enable pins (two active-low and one active-high) that allow precise control over output activation, making it ideal for applications like memory selection, microprocessor interfacing, and digital signal routing.
This IC is compatible with standard TTL logic levels, ensuring reliable operation in a variety of digital electronics systems. It is frequently used in educational experiments, digital logic labs, embedded systems, and electronic control projects.
The 74138 offers robust performance, low propagation delay, and straightforward implementation, making it an essential component for both beginner and advanced electronics enthusiasts.
Technical Specifications
IC Type: Logic Decoder / Demultiplexer
Model: 74138
Function: 3-to-8 line decoding
Number of Inputs: 3
Number of Outputs: 8 (active-low)
Enable Inputs: 3 (2 active-low, 1 active-high)
Operating Voltage: 4.5V – 5.5V DC
Logic Family: TTL
Propagation Delay: 15 ns (typical)
Package Type: DIP-16
What’s in the Box
1 × 74138 Logic IC
Ideal For
Digital electronics projects
Memory address decoding
Microprocessor and microcontroller interfacing
Logic routing and control circuits
Educational and lab experiments
Important Note
Ensure proper supply voltage (5V DC) and observe the enable pin logic carefully. Outputs are active-low, so plan your circuit accordingly. Handle the IC with care to prevent static discharge damage.