CD74HCT139EG4

Overview

The CD74HCT139EG4 is a dual 2-to-4 line decoder/demultiplexer manufactured by Texas Instruments. It belongs to the 74HCT logic series and operates on a single power supply ranging from 4.5V to 5.5V. The device features two independent circuits, each decoding two binary inputs into four active-low outputs. It utilizes a 16-PDIP (0.300 inch, 7.62mm) through-hole package. Electrical characteristics include output high and low currents of 4mA each. The component supports an operating temperature range from -55°C to +125°C.

Feature Summary

• Dual independent 2-to-4 line decoding functionality within a single integrated circuit
• High-speed CMOS technology ensuring compatibility with standard TTL logic levels
• Active-low output states for precise signal demultiplexing applications

Applications

• Address decoding in microprocessor-based systems
• Data routing and distribution in digital communication circuits
• Memory chip selection logic in embedded controllers

Procurement Notes

Verify current availability status as this specific part number may be discontinued or superseded by newer revisions. Confirm that the 16-PDIP package dimensions align with existing PCB footprints. Ensure the 4.5V to 5.5V supply voltage requirements match the target system design constraints before finalizing procurement decisions.

Selection Notes

Select this component when dual independent decoding channels are required in a through-hole configuration. The HCT series offers superior noise immunity compared to standard HC logic while maintaining compatible input thresholds. Consider the 4mA drive capability for direct interface with subsequent logic stages without additional buffering requirements.

Part Context

This device is part of the broader 74HCT family of high-speed CMOS logic devices produced by Texas Instruments. It shares functional similarities with other 74HCT decoders but is distinct in its dual-channel architecture. The EG4 suffix typically denotes environmental compliance and specific packaging variations within the manufacturer's lineup.

Replacement Considerations

The CD74HCT139E is identified as a manufacturer-recommended alternative. Verify pinout compatibility and electrical specifications before substitution. Other equivalents may exist from different manufacturers, but direct replacement requires confirmation of package and performance alignment.