CD74HC139M

Signal Switches, Multiplexers, Decoders Overview

The CD74HC139M is a high-speed CMOS logic component manufactured by Harris Corporation. It functions as a dual 2-to-4 line decoder/demultiplexer housed in a 16-pin Small Outline Package (SOP). The device operates within a supply voltage range of 2V to 6V and supports an extended industrial temperature range from -55°C to 125°C. It features inverted outputs and includes three enable inputs to facilitate cascading configurations.

Signal Switches, Multiplexers, Decoders Feature Summary

• Dual independent 2-to-4 line decoding circuits integrated into a single package
• Inverted output polarity for active-low signal selection
• Three enable inputs designed to simplify cascading multiple units
• High noise immunity with balanced propagation delays

Signal Switches, Multiplexers, Decoders Applications

• Memory address decoding systems
• Data routing applications
• I/O port selection circuits
• Bus driver output control

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the manufacturer designation, as Harris Corporation's semiconductor assets were acquired by Texas Instruments. Confirm that the specific part number corresponds to the original Harris production run rather than subsequent TI manufacturing. Check RoHS compliance status, as older Harris batches may not meet current environmental standards. Ensure the SOP-16 package dimensions match the design requirements.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a dual 2-to-4 decoder with inverted outputs is required. It serves as an alternative to the HC138 series if fewer output lines per circuit are needed. Verify that the 2V to 6V operating voltage aligns with the system power supply. Consider the extended temperature range (-55°C to 125°C) for harsh environment applications.

Signal Switches, Multiplexers, Decoders Part Context

This component belongs to the HC/UH series of high-speed CMOS logic devices. It shares functional similarities with other decoders like the CD74HC138 but offers two separate 2-to-4 channels instead of one 3-to-8 channel. The device provides low power consumption typical of CMOS technology while maintaining speed comparable to Low-Power Schottky TTL logic.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Public confirmed substitute part numbers include MM74HC139M and M74HC139B1R.