MC74ACT139MEL

Overview

The MC74ACT139MEL is a high-speed dual 1-of-4 decoder/demultiplexer manufactured by onsemi. It features two independent decoders, each accepting two binary weighted address inputs (A0-A1) and providing four mutually exclusive active-LOW outputs (O0-O3). Each decoder includes 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 TTL-compatible inputs. It is housed in a 16-lead EIAJ package.

Feature Summary

• Dual independent 1-of-4 decoder functionality with active-LOW mutually exclusive outputs
• Enable inputs support demultiplexer operations or minterm generation
• TTL-compatible inputs ensure compatibility with standard logic families
• High-speed operation suitable for complex logic network implementations

Applications

• Address decoding in memory systems
• Data routing via demultiplexer configurations
• Logic function generation using minterms
• Replacing multiple discrete gate functions to reduce component count

Procurement Notes

Verify the specific ordering suffix 'MEL' corresponds to the EIAJ-16 tape and reel packaging configuration. Confirm RoHS compliance status through official documentation, as specifications apply to both standard and lead-free devices. Ensure the procurement channel provides valid traceability for the semiconductor components.

Selection Notes

Select this component when a dual decoder solution with TTL-compatible inputs is required. The ACT series ensures compatibility with standard TTL logic levels while offering AC performance characteristics. Consider the EIAJ package format if it aligns with existing board layout constraints or legacy design requirements.

Part Context

This part belongs to the MC74AC/ACT139 family of dual 1-of-4 decoders. The 'ACT' designation indicates TTL-compatible inputs, distinguishing it from the standard AC series which has CMOS-compatible thresholds. The device is designed for high-speed digital applications requiring efficient address decoding or data distribution.

Replacement Considerations

MC74ACT139D serves as a pin-compatible alternative in SOIC-16 packaging. MC74ACT139N is available in PDIP-16 format. Verify electrical parameters and package dimensions before substitution to ensure mechanical and functional compatibility.