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MC74LCX138DTR2

MC74LCX138DTR2 Description

The MC74LCX138DTR2 is a high-performance, low-voltage 1-of-8 decoder/demultiplexer from ON Semiconductor's 74LCX series. Designed for surface-mount applications, this IC operates within a 2V to 3.6V supply range, making it ideal for modern low-power digital systems. Housed in a 16-pin TSSOP package and supplied in Tape & Reel (TR), it is optimized for automated assembly processes. The device features 24mA output drive capability (both high and low) and is compliant with EAR99 export control regulations. Although marked as obsolete, it remains a reliable choice for legacy designs due to its robust performance and REACH Unaffected status.

MC74LCX138DTR2 Features

• Low-Voltage Operation: Supports 2V to 3.6V, compatible with 3.3V and mixed-voltage systems.
• High-Speed Decoding: Efficient 1 x 3:8 decoding/demultiplexing with minimal propagation delay.
• Balanced Output Drive: 24mA sink/source current ensures strong signal integrity in bus-oriented applications.
• Surface-Mount Design: 16-TSSOP package saves board space and suits high-density PCB layouts.
• Low Power Consumption: CMOS technology reduces static and dynamic power dissipation.
• Moisture Sensitivity Level 1 (MSL1): Suitable for extended storage and handling without baking.

MC74LCX138DTR2 Applications

• Address Decoding: Ideal for memory and peripheral selection in microcontrollers and FPGAs.
• Data Routing: Used in multiplexed bus systems to direct signals to multiple destinations.
• Low-Voltage Systems: Fits battery-powered devices, IoT nodes, and portable electronics.
• Industrial Control: Reliable performance in automation and sensor interfacing applications.
• Legacy System Maintenance: Suitable for repairing or upgrading older designs requiring 3.3V logic.

Conclusion of MC74LCX138DTR2

The MC74LCX138DTR2 offers a blend of low-voltage operation, high-speed decoding, and robust output drive, making it a versatile choice for digital systems. While obsolete, its compatibility with 3.3V logic, compact packaging, and reliability ensure continued relevance in specific applications. Engineers working on low-power designs, legacy upgrades, or space-constrained layouts will find this decoder/demultiplexer a practical solution. For new designs, ON Semiconductor's active alternatives should be evaluated, but the 74LCX138 remains a proven performer in its niche.