SN74HC139D

Overview

The SN74HC139D is a dual 2-line to 4-line decoder/demultiplexer in a 16-pin SOIC package. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature from -40°C to 85°C. Propagation delay (tpd) ranges from 12 ns to 44 ns depending on voltage, with typical values around 10 ns. Output drive capability reaches ±4 mA at 5 V, while input current remains low at 1 μA max.

Feature Summary

• Designed for high-speed memory decoders and data-transmission systems
• Incorporates two enable inputs to simplify cascading and data reception
• Features fully buffered inputs representing only one normalized load

Applications

• High-performance memory decoding
• Data-routing applications
• Demultiplexing circuits

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest Package Option Addendum to confirm status, as the base SN74HC139D designation may be obsolete or superseded by variants like SN74HC139DR. Ensure the selected part matches the required thermal resistance and moisture sensitivity level for the intended assembly process.

Selection Notes

Select this component when low power consumption and short propagation delays are critical for system performance. The device accommodates wide voltage variations suitable for various logic families. Verify that the 16-pin SOIC footprint aligns with existing board layout constraints and thermal management requirements.

Part Context

This device belongs to the SNx4HC139 family of CMOS logic ICs. It provides two independent decoders within a single package, allowing efficient use of board space. The HC series offers compatibility with standard TTL loads while maintaining low static power dissipation characteristics typical of modern CMOS technology.

Replacement Considerations

• SN74HC139DR