CD74HCT139MT

Overview

The CD74HCT139MT is a high-speed CMOS logic device manufactured by Texas Instruments, featuring dual independent 2-to-4-line decoder/demultiplexer circuits. It operates within a supply voltage range of 4.5V to 5.5V and supports output drive currents of 4mA for both high and low states. The component is housed in a 16-SOIC surface-mount package and is rated for an operating temperature range from -55°C to +125°C.

Feature Summary

• Dual independent decoding or demultiplexing functionality
• High-speed CMOS technology with balanced propagation delays
• Significant power reduction compared to LSTTL standards

Applications

• Address decoding in microprocessor systems
• Data routing and distribution networks
• Control signal generation for peripheral devices

Procurement Notes

Verify the specific suffix 'MT' confirms the SOIC-16 surface mount package variant. Confirm RoHS compliance status as lead-free variants may carry additional identifiers. Ensure the source document explicitly lists this part number to avoid confusion with through-hole DIP equivalents like the EG4 series.

Selection Notes

Select this component when dual 2-to-4 decoding is required in space-constrained designs. The HCT logic level ensures compatibility with standard TTL inputs while offering CMOS noise immunity. Verify that the 4mA output current meets the load requirements of the connected circuitry before finalizing the design.

Part Context

This device belongs to the Texas Instruments 74HCT logic family, which bridges HC CMOS performance with TTL input compatibility. The 139 series specifically provides dual decoders, commonly used for memory addressing or I/O selection in digital systems requiring multiple distinct output lines from minimal control signals.

Replacement Considerations

The CD74HCT139E is listed as a manufacturer-recommended alternative. Verify pinout and electrical specifications match before substitution.