IC 3 to 8 line Decoder Demultiplexer DIP-16
Review: 5 - "A masterpiece of literature" by John Doe, written onMay 4, 20020
74HC138 IC 3-to-8 line Decoder Demultiplexer DIP-16
74HC138 IC 3-to-8 line Decoder Demultiplexer DIP-16_1
74HC138 IC 3-to-8 line Decoder Demultiplexer DIP-16_2

IC 3 to 8 line Decoder Demultiplexer DIP-16

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  • Product SKU: INTEG056
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The 74HC138 is a CMOS-based integrated circuit that functions as a 3-to-8 line decoder/demultiplexer.

Here's some information about the 74HC138:

Functionality: The 74HC138 is a decoder/demultiplexer that takes a 3-bit binary input and selects one of eight output lines based on that input. It can be used to decode a binary-coded input into one of eight mutually exclusive outputs.

DIP-16 Package: The "DIP-16" designation indicates that the 74HC138 is packaged in a Dual Inline Package with 16 pins.

Input Pins: The 74HC138 typically has three input pins (A0, A1, and A2) for the 3-bit binary input.

Output Pins: The IC has eight output pins (Y0 to Y7) representing the decoded outputs. Only one of these outputs is active (low) at a time based on the binary input.

Enable Pins: Some versions of the 74HC138 include an enable input (often labeled as "G" or "E") that allows you to enable or disable the operation of the decoder.

CMOS Technology: CMOS technology is known for its low power consumption and wide operating voltage range. The 74HC138 is compatible with both TTL (Transistor-Transistor Logic) and CMOS logic levels.

Power Supply: The 74HC138 typically operates with a wide range of power supply voltages.


The 74HC138 is commonly used in digital systems where multiple devices or functions need to be selected using a binary-coded input. It's often employed in address decoding in microprocessor or microcontroller applications.

Usage Considerations: When using the 74HC138, consider the voltage levels of your signals, power supply requirements, and proper connections based on the specific application.


  • Typical propagation delay: 20 ns
  • Wide power supply range: 2V–6V
  • Low quiescent current: 80 µA maximum (74HC Series)
  • Low input current: 1 µA maximum
  • Fanout of 10 LS-TTL loads
  • Designed specifically for high speed
  • Incorporates three enable pins to simplify cascading
  • De-multiplexing capability
  • Schottky clamped for high performance
  • ESD protection
  • Balanced propagation delays
  • Inputs accept voltages higher than VCC
  • Supply voltage: 1.0V to 5.5V
  • Typical propagation delay: 21nS
  • Low power consumption: 32mW
  • Operating temperature: -40ºC to +125ºC


  • Line decoders
  • Servers
  • Digital systems
  • Line De-multiplexing
  • Telecom circuits
  • Memory circuits

Physical Attributes

  • Weight (gm) : 2


Package Includes

  • 1 x74HC138 IC 3-to-8 line Decoder/Demultiplexer DIP-16

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