74VHCT138AM

Signal Switches, Multiplexers, Decoders Overview

The Fairchild Semiconductor 74VHCT138AM is a high-speed CMOS 3-to-8 decoder and demultiplexer. It operates on a single power supply ranging from 4.5V to 5.5V. The device features three address inputs and eight active-low outputs, along with three enable inputs for flexible system control. It utilizes standard TSSOP or SOIC packaging options suitable for surface mount applications. The component supports an operating temperature range of -40°C to 85°C and provides output drive currents of 8mA for both high and low states.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides decoding functionality converting three binary address lines into one of eight active-low output selections
• Includes multiple enable inputs allowing precise synchronization and system-level control of the decoding operation
• Utilizes advanced CMOS technology to achieve high switching speeds while maintaining low power consumption characteristics

Signal Switches, Multiplexers, Decoders Applications

• Address decoding in microprocessor-based memory systems
• Demultiplexing data streams in digital communication interfaces
• Control signal generation for peripheral device selection in embedded systems

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify current production status as this part may be discontinued by the original manufacturer. Confirm equivalent availability from authorized distributors such as onsemi. Check RoHS compliance requirements against specific project standards. Ensure package type matches PCB footprint specifications before ordering. Validate lead times due to potential obsolescence or supply chain constraints for legacy logic components.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a reliable 3-to-8 decoding solution is required within a 5V logic environment. Consider the 74VHCT series compatibility with TTL input levels if interfacing with older digital systems. Evaluate pinout compatibility with existing board layouts if replacing similar decoder ICs. Verify that the package style meets thermal and mechanical design constraints for the target application.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the 74VHCT logic family, designed for high-speed operations with CMOS efficiency. It serves as a direct replacement for earlier 74HC or 74HCT decoder variants in many designs. The component is widely used in industrial and consumer electronics requiring efficient address mapping. Its robust construction ensures stable performance across varying environmental conditions typical in commercial applications.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The 74VHCT138AMTCX is a verified substitute part number available from onsemi. This alternative maintains identical logical functionality and pin configuration. Users should verify package dimensions and marking codes when transitioning between manufacturers. Cross-reference datasheets to ensure electrical parameters remain consistent for the specific application requirements.