MC74AC139DT

Overview

The MC74AC139DT is a dual 1-of-4 decoder/demultiplexer from the onsemi 74AC logic family. It features two independent decoders, each with two address inputs and four mutually exclusive active-low outputs. The device operates within a supply voltage range of 2V to 6V and supports surface-mount installation in a 16-TSSOP package. It functions across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Contains two completely independent 1-of-4 decoder circuits
• Provides active-low mutually exclusive outputs for precise signal selection
• Supports high-speed CMOS operation with wide voltage tolerance

Applications

• Address decoding for memory systems
• Demultiplexing data streams in digital communication
• Control logic for peripheral device selection

Procurement Notes

Verify the specific suffix 'DT' corresponds to the TSSOP-16 package and tape-and-reel or cut-tape availability as defined by the manufacturer's current datasheet. Confirm RoHS compliance status and ensure the component meets the required operating temperature specifications for the intended application environment before finalizing procurement.

Selection Notes

Select this component when dual independent decoding channels are required within a single package. The AC series offers higher speed performance compared to standard HC variants while maintaining compatibility with similar form factors. Ensure the design accommodates the 2V to 6V supply range and utilizes appropriate pull-up or pull-down resistors if necessary for stable logic levels.

Part Context

This part belongs to the widely adopted 74AC logic family, known for balanced speed and power consumption. It serves as a functional equivalent to other industry-standard dual decoder ICs, facilitating drop-in replacements in legacy designs requiring enhanced switching speeds without altering the fundamental pinout configuration.

Replacement Considerations

Compatible substitutes include MC74AC139DTR2G and 74AC139MTCX. Verify that alternative packages match the physical footprint and that electrical characteristics align with system requirements.