Tutorial: 74HC138 / 74HC238

Combines, stores or sequences digital signals.

74HC138 / 74HC238

Tutorial / documentation

Logic & timing

Quick documentation & first test preparation

  1. Identify component 74HC138 and its package.
  2. Read the truth table or timing diagram.
  3. Check the logic family, power supply and states of unused inputs.
  4. Consult the application circuit in the linked documentation before testing.

74HC138

3-to-8 line decoder/multiplexer inverting, DIP-16/SOIC-16/SSOP-16

  • 3-to-8 line decoder/multiplexer inverting, DIP-16/SOIC-16/SSOP-16
  • Read the truth table or timing diagram.
  • Check the logic family, power supply and states of unused inputs.
  • The manufacturer’s pinout and absolute limits take precedence over this page.
Technical documentation

74HC238

3-to-8 line decoder/multiplexer, DIP-16/SOIC-16/SSOP-16

  • 3-to-8 line decoder/multiplexer, DIP-16/SOIC-16/SSOP-16
  • Read the truth table or timing diagram.
  • Check the logic family, power supply and states of unused inputs.
  • The manufacturer’s pinout and absolute limits take precedence over this page.
Technical documentation

Inputs and outputs must match the function described in the selected reference’s documentation.