MC74ACT139DTR2

Overview

The MC74ACT139DTR2 is a high-speed dual 1-of-4 decoder/demultiplexer manufactured by onsemi. It contains two independent decoders, each accepting two binary weighted address inputs (A0-A1) and providing four mutually exclusive active-LOW outputs (O0-O3). Each decoder features an active-LOW enable input that can function as a data input for demultiplexing applications. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports output source/sink currents of 24 mA. It utilizes TTL-compatible inputs and is available in a 16-lead TSSOP surface-mount package.

Feature Summary

• Dual independent 1-of-4 decoder functionality with active-LOW mutually exclusive outputs
• Enable inputs serve as data inputs for 4-output demultiplexer configurations
• TTL-compatible inputs facilitate interface with standard logic families
• Outputs capable of sourcing and sinking 24 mA current

Applications

• Address decoding in microprocessor systems
• Data distribution via demultiplexer circuits
• Function generation providing minterms of two variables
• Replacing multiple discrete gate functions to reduce component count

Procurement Notes

Verify the specific ordering suffix 'DTR2' corresponds to the Tape & Reel packaging format when placing orders. Confirm that the ACT series designation ensures compatibility with TTL input voltage thresholds required by the target system design. Ensure procurement channels provide official datasheets to validate electrical characteristics against application requirements.

Selection Notes

Select this component when a dual decoder or demultiplexer solution is required within a 5V logic environment. The ACT series is appropriate for designs needing TTL-compatible input levels while maintaining CMOS output drive capabilities. Consider the TSSOP-16 package constraints regarding thermal management and PCB layout space compared to through-hole alternatives.

Part Context

This part belongs to the MC74AC/ACT139 family of dual 1-of-4 decoders. It shares functional similarities with the MC74AC139 but differs in input threshold specifications to support TTL compatibility. The device is designed to replace multiple discrete gates, simplifying logic network architecture and reducing the total number of packages required in digital circuit implementations.

Replacement Considerations

MC74AC139DTR2G serves as a compatible alternative within the same family, differing primarily in input threshold specifications rather than logical function.