74HC138 (3 to 8 Line Decoder ) SMD

Overview

The 74HC138 is a high-speed, 3-to-8 line decoder/demultiplexer from the 74HC family, packaged in a compact SMD (Surface Mount Device) format. This IC decodes three binary address inputs (A0, A1, A2) into eight mutually exclusive active-low outputs (Y0–Y7). It features three enable inputs (E1, E2, E3) for flexible cascading and easy integration into complex digital systems. Operating over a wide voltage range of 2V to 6V, the 74HC138 is ideal for memory address decoding, data routing, and logic function generation in both hobbyist and professional projects.

Key Features

• 3-to-8 line decoding: Converts 3 binary inputs into 8 individual outputs.
• Active-low outputs: Simplifies interfacing with other active-low logic families.
• Three enable inputs: Two active-low (E1, E2) and one active-high (E3) for versatile control.
• Wide supply voltage range: 2V to 6V, compatible with TTL and CMOS levels.
• High-speed operation: Propagation delays typical of 74HC series.
• Low power consumption: CMOS technology ensures minimal current draw.
• SMD package: 16-SOIC (0.154", 3.90mm Width) for compact PCB designs.
• Industry-standard pinout: Easy to use in existing designs.

Technical Specifications

• Type: Decoder/Demultiplexer
• Number of Circuits: 1
• Circuit Configuration: 1 x 3:8
• Voltage Supply Source: Single
• Supply Voltage Range: 2V ~ 6V
• Output Current: Low: 5.2mA, High: 5.2mA
• Package: 16-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Operating Temperature: Typically -40°C to +85°C (refer to datasheet)

Applications & Use Cases

• Memory address decoding: Select specific memory chips in microcontroller systems.
• Data routing: Demultiplex data lines to multiple peripherals.
• Logic function implementation: Generate complex Boolean functions.
• LED matrix control: Drive multiple LEDs with fewer I/O pins.
• Educational projects: Teach digital logic and combinational circuits.
• Robotics and automation: Expand I/O capabilities for sensors and actuators.

What's Included

• 1 x 74HC138 (3 to 8 Line Decoder) SMD IC

Compatibility

• Works with 5V and 3.3V logic systems (when powered accordingly).
• Compatible with Arduino, Raspberry Pi, STM32, PIC, and other microcontrollers.
• Can be used with TTL logic levels (5V) and CMOS logic levels (3.3V-6V).

MOKWN Recommendation

For Egyptian makers, students, and engineers, the 74HC138 SMD is an essential component for expanding digital outputs in your projects. Its compact SMD package is perfect for PCB designs, and its wide voltage range makes it versatile for various applications. Whether you're building a memory decoder, LED matrix, or complex logic circuit, this IC delivers reliable performance. Pair it with our range of breakout boards and prototyping tools for a seamless development experience.