MM74HC139N

Signal Switches, Multiplexers, Decoders Overview

The MM74HC139N is a dual 2-to-4 line decoder manufactured by onsemi, housed in a 16-lead Plastic Dual-In-Line Package (PDIP). It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range from -40 °C to +85 °C. The device contains two independent decoders, each featuring a single active low enable input and two binary select inputs that drive four normally high outputs low. It utilizes advanced silicon-gate CMOS technology, offering high noise immunity and low power consumption comparable to low power Schottky TTL logic.

Signal Switches, Multiplexers, Decoders Feature Summary

• Contains two independent one-of-four decoders with active low enable inputs
• Outputs drive ten low power Schottky TTL equivalent loads
• Functionally and pin equivalent to the 74LS139
• Inputs protected from static discharge damage via diodes to VCC and ground

Signal Switches, Multiplexers, Decoders Applications

• Memory address decoding
• Data routing applications

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific package configuration against the datasheet, as the MM74HC139 series includes SOIC, SOP, TSSOP, and PDIP options. Confirm the manufacturer lineage, noting that Fairchild Semiconductor products are now part of onsemi. Ensure the component meets the required environmental specifications for the intended application environment.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a dual 2-to-4 decoder compatible with 74LS139 pinouts is required. Consider the PDIP package for through-hole mounting requirements. Evaluate the propagation delay characteristics against system timing constraints, particularly at lower supply voltages where delays increase significantly.

Signal Switches, Multiplexers, Decoders Part Context

This component belongs to the 74HC logic family, which provides high-speed CMOS performance. It serves as a direct replacement or upgrade for older bipolar logic families like 74LS, offering improved power efficiency while maintaining interface compatibility with existing TTL-based designs.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The datasheet confirms functional and pin equivalence to the SN74LS139.