MC74AC139DTR2

Overview

The MC74AC139DTR2 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 or generate minterms of two variables. The device operates on a single power supply with a voltage range of 2.0 V to 6.0 V. It supports output source and sink currents of 24 mA and is available in a 16-lead TSSOP package.

Feature Summary

• Dual independent 1-of-4 decoder functionality
• Active-LOW mutually exclusive outputs
• Demultiplexer capability via active-LOW Enable input
• Function generator capability for two-variable minterms

Applications

• Address decoding in digital systems
• Data distribution using demultiplexer mode
• Logic function generation replacing multiple gates

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with system voltage requirements within the 2.0 V to 6.0 V operating range. Confirm RoHS compliance status if required by assembly standards. Cross-reference datasheet revision numbers to ensure accurate electrical parameter validation for the specific production lot.

Selection Notes

Select this component when dual independent decoding or demultiplexing is required within a single package. The AC series offers high-speed performance suitable for general logic applications. Consider the ACT variant if TTL-compatible input thresholds are necessary for interfacing with legacy logic families. Verify that the 24 mA output drive current meets load requirements.

Part Context

This part belongs to the MC74AC139 family of dual 1-of-4 decoders and demultiplexers. It is designed for high-speed CMOS logic applications requiring low power consumption and wide supply voltage operation. The device serves as a versatile building block for address decoding, data routing, and combinational logic implementation in embedded systems and industrial control applications.

Replacement Considerations

MC74ACT139DTR2G