MC74ACT139DTG

Overview

The MC74ACT139DTG 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 surface-mount TSSOP-16 packaging.

Feature Summary

• Contains two completely independent 1-of-4 decoders with active-LOW mutually exclusive outputs
• Outputs are capable of sourcing and sinking up to 24 mA
• Features TTL-compatible inputs characteristic of the ACT logic series
• Each decoder half can generate all four minterms of two variables

Applications

• Address decoding in memory systems
• Data distribution via demultiplexing
• Logic function generation using minterms
• Replacing multiple discrete gate functions in logic networks

Procurement Notes

Verify the specific suffix 'DTG' corresponds to the TSSOP-16 package and lead-free status. Confirm the datasheet revision matches current manufacturing specifications. Ensure the ordering code aligns with the required shipping quantity format, such as tape and reel or rail units, as defined in the manufacturer's ordering information section.

Selection Notes

Select this component when a dual decoder configuration is required within a single package to reduce board space. The ACT series provides TTL-compatible input thresholds while maintaining CMOS performance. Verify that the 24 mA output drive capability meets the load requirements of the connected circuitry and that the operating temperature range suits the application environment.

Part Context

This part belongs to the MC74AC/ACT139 family of dual 1-of-4 decoders. It shares functional similarities with other members like the MC74AC139 but differs in input threshold characteristics due to the ACT logic family. The DTG suffix specifically denotes the TSSOP-16 surface-mount package variant offered by onsemi.

Replacement Considerations

MC74ACT139DR2G is a confirmed substitute offering the same functionality in a SOIC-16 package.