CD74HC138E

Signal Switches, Multiplexers, Decoders Overview

The CD74HC138E is a high-speed CMOS logic device manufactured by Texas Instruments, functioning as a 3-to-8 line decoder and demultiplexer. It operates within a supply voltage range of 2V to 6V and features three binary address inputs (A0, A1, A2) that select one of eight mutually exclusive active-low outputs. The component includes two active-low enable inputs and one active-high enable input for cascading flexibility. Packaged in a 16-pin DIP format, it supports a wide operating temperature range from -55°C to 125°C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides eight mutually exclusive active-low outputs selected by three binary weighted address inputs
• Features composite enable inputs allowing easy expansion into larger decoding configurations
• Offers low power consumption typical of CMOS technology with speed comparable to low-power Schottky TTL
• Compatible with standard CMOS interfaces and suitable for memory address decoding applications

Signal Switches, Multiplexers, Decoders Applications

• Memory address decoding systems
• Data routing and distribution networks
• I/O port addressing schemes
• Demultiplexing control signals

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific suffix 'E' corresponds to the PDIP-16 package configuration when sourcing. Confirm RoHS compliance status for the specific manufacturing lot. Ensure the supplier provides official datasheets matching the Texas Instruments part number to guarantee functional equivalence with original specifications.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component for designs requiring high-speed decoding with low static power dissipation. It serves as a direct replacement for legacy 74LS138 circuits where lower power is critical. Consider the wide temperature range for industrial environments. Verify voltage levels match the system's 2V to 6V operational requirements.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the 74HC series of high-speed CMOS logic components. It is functionally related to the CD74HC238, which provides active-high outputs instead of active-low. The HC family bridges the gap between traditional CMOS speed limitations and TTL performance standards, making it versatile for mixed-logic system designs.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct substitutes include SN74HC138AN and CD74HC138N. Alternative manufacturers offer equivalent parts such as TC74HC138APF and M74HC138B1R. Ensure pinout compatibility and electrical characteristics match before swapping suppliers.