74138 3-to-8 Line Decoder/Demultiplexer IC

The 74138 is a TTL logic IC that decodes three binary address inputs into eight mutually exclusive outputs.
It features active-low outputs and multiple enable inputs for flexible decoding control.
The device operates from a single 5 V supply and is compatible with standard TTL logic levels.
Its enable structure allows cascading for larger decoding systems.
Typical applications include address decoding, memory selection, and digital signal routing.

• 3-to-8 Decoder Architecture providing one-of-eight decoding

• Active-Low Outputs suitable for address and logic decoding

• Multiple Enable Inputs supporting cascading configurations

• TTL Logic Family compatible with standard TTL levels

• Single 5 V Supply Operation for digital systems

• Through-Hole DIP Package for breadboard and PCB use

• Model | 74138

• Device Type | 3-Line to 8-Line Decoder/Demultiplexer IC

• Logic Family | TTL

• Input Lines | 3

• Output Lines | 8 (Active-Low)

• Enable Inputs | 3 (2 Active-Low, 1 Active-High)

• Supply Voltage | 5 V

• Propagation Delay (Typical) | 15 ns

• Output Sink Current (Max) | 16 mA

• Power Consumption (Typical) | 75 mW

• Operating Temperature Range | 0 °C to 70 °C

• Package Type | 16-Pin DIP

• 3D Model
• Datasheet