MC74ACT138ML1

Overview

The MC74ACT138ML1 is a high-speed CMOS logic decoder manufactured by onsemi, belonging to the 74ACT series. It functions as a 1-of-8 decoder/demultiplexer with three binary address inputs and eight active-low outputs. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports surface-mount installation in an ML1 package variant. It is designed for applications requiring fast propagation delays and low power consumption, suitable for memory address decoding and I/O control systems.

Feature Summary

• Provides one-hot decoding of three-bit binary addresses into eight distinct active-low output lines
• Features three enable inputs that must be satisfied simultaneously to activate the decoding function
• Utilizes advanced CMOS technology to achieve high switching speeds while maintaining low static power dissipation

Applications

• Memory address decoding in computer systems
• I/O port selection in embedded controllers
• Demultiplexing data streams in communication interfaces

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and moisture sensitivity level prior to assembly. Ensure storage conditions meet specified humidity requirements to prevent package degradation. Review datasheet for specific handling precautions related to the ML1 package type.

Selection Notes

Select this component when a single 3-to-8 line decoder is required within the 74ACT logic family. Consider the ML1 package availability against standard SOIC alternatives if board space constraints exist. Verify that the operating temperature range and supply voltage specifications align with the target system design requirements.

Part Context

This part belongs to the widely adopted 74ACT logic family, known for compatibility with TTL levels while offering CMOS performance benefits. The 138 designation specifically refers to the 3-to-8 decoder topology. Variants like the MC74ACT138DG offer similar functionality in different packaging options such as SOIC-16.

Replacement Considerations

Direct substitutes include MC74ACT138DR2G and MC74ACT138DTR2G from onsemi, which provide identical logical functionality in tape-and-reel packaging formats.