CD74AC139E

Signal Switches, Multiplexers, Decoders Overview

The CD74AC139E is a dual 2-to-4-line decoder/demultiplexer manufactured by Harris Corporation. It belongs to the AC logic series and operates on a single power supply source. The device contains two independent circuits, each functioning as a binary to one-of-four decoder with an active low enable input. It is designed for through-hole mounting in a 16-pin PDIP package. The component supports an operating temperature range from -55°C to 125°C and is classified as obsolete.

Signal Switches, Multiplexers, Decoders Feature Summary

• Contains two independent 2-to-4-line decoder/demultiplexer circuits
• Features active low enable inputs for each decoder section
• Supports single supply voltage operation
• Designed for through-hole surface mounting

Signal Switches, Multiplexers, Decoders Applications

• Binary decoding applications requiring dual independent channels
• Demultiplexing data signals in digital systems
• Address decoding in memory or I/O interfacing
• Signal routing in embedded control circuits

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify component status carefully as this part is listed as obsolete. Confirm manufacturer authenticity given potential availability from secondary sources. Check RoHS compliance status as older Harris components may not meet current environmental standards. Ensure packaging type matches system requirements for through-hole assembly. Validate pinout compatibility if substituting into existing designs.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component only when dual independent decoding is required within a single package. Consider the AC logic family speed and power characteristics against system needs. Verify that the 16-pin DIP package fits the target PCB layout constraints. Evaluate thermal performance within the specified -55°C to 125°C operating range. Confirm that active low enable logic aligns with control signal polarity in the design.

Signal Switches, Multiplexers, Decoders Part Context

This decoder is part of Harris Corporation's broader AC logic family, which offers high-speed CMOS performance. The CD74AC139E specifically provides dual-channel functionality, reducing component count compared to using separate single decoders. It serves as a direct functional substitute for other manufacturers' dual 2-to-4 decoders like the MC74AC139NG, maintaining identical circuit topology and electrical behavior.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The MC74AC139NG is a confirmed qualified substitute with identical circuit functionality. Both components share the same dual 2-to-4 decoder configuration and output characteristics. Verify pin-for-pin compatibility before replacement. Ensure voltage and temperature specifications match the original design requirements.

Signal Switches, Multiplexers, Decoders FAQ

How many independent decoder circuits are contained in the CD74AC139E?

The CD74AC139E contains two independent 2-to-4-line decoder/demultiplexer circuits.

What is the enable input configuration for the decoders?

Each decoder section has a single active low enable input.

Is the CD74AC139E suitable for through-hole mounting?

Yes, the component is designed for through-hole mounting in a 16-pin PDIP package.