MC74ACT138DR2G

Overview

The MC74ACT138DR2G is a high-speed CMOS decoder/demultiplexer from the 74ACT series, manufactured by onsemi. It features a single 3-to-8 line decoding circuit housed in a 16-pin SOIC package. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports surface mount installation. It functions across an extended industrial temperature range from -40°C to +85°C. Outputs provide symmetric drive capabilities with 24 mA source and sink currents. The component complies with RoHS3 standards and carries an MSL rating of 1.

Feature Summary

• Provides one-of-eight decoding functionality for address decoding or data distribution applications
• Features three active-low enable inputs to manage chip selection and power states
• Delivers symmetrical output drive strength for reliable signal transmission
• Utilizes low-power CMOS technology compatible with standard logic families

Applications

• Address decoding in microprocessor-based systems
• Data distribution networks requiring demultiplexing
• Industrial control logic interfacing
• Memory bank selection circuits

Procurement Notes

Verify the complete part number including suffixes against official manufacturer documentation to ensure correct packaging and environmental compliance. Confirm that the specific variant matches the required operating temperature range and package dimensions for your PCB layout. Cross-reference datasheet electrical characteristics with system requirements before finalizing procurement decisions.

Selection Notes

Select this component when a single 3-to-8 decoder is required within the 74ACT logic family. Ensure the design utilizes a 5V supply rail as the device does not support lower voltages. Verify that the SOIC-16 footprint aligns with existing board space constraints. Consider the 24 mA output current capability when driving loads directly without additional buffering stages.

Part Context

This part belongs to the broader 74ACT138 family of decoders produced by onsemi. It shares functional similarities with other variants in the series but differs in packaging and specific ordering suffixes. The ACT series bridges performance gaps between older TTL and modern AC logic families, offering faster switching speeds than standard HC counterparts while maintaining similar pinouts.

Replacement Considerations

Direct substitutes include the 74ACT138SC and 74ACT138SCX from onsemi. These alternatives offer identical logical functionality but may differ in tape-and-reel specifications or moisture sensitivity handling. Verify pin compatibility and electrical parameters before swapping components in existing designs.