SN74ALS139DR

Overview

The SN74ALS139DR is a dual 2-line to 4-line decoder/demultiplexer from Texas Instruments, part of the ALS logic series. It features a 16-pin SOIC package with surface mount installation. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a propagation delay time of 14 ns. It functions effectively in high-performance memory-decoding or data-routing applications across an operating temperature range of 0°C to +70°C.

Feature Summary

• Dual independent 2-to-4 decoding or demultiplexing channels
• High-speed silicon-gate CMOS technology for efficient data routing
• Active-low outputs compatible with standard logic interfaces

Applications

• High-performance memory address decoding
• Data routing and multiplexing systems
• Industrial control logic circuits

Procurement Notes

Verify the specific revision level and tape-and-reel packaging configuration when ordering. Confirm that the SOIC-16 footprint matches the target PCB design. Ensure the supplier provides original manufacturer documentation to validate authenticity and traceability for quality assurance purposes.

Selection Notes

Select this component for designs requiring dual decoding channels in a compact surface-mount format. The ALS series offers a balance of speed and power consumption suitable for general-purpose digital logic. Consider the 14 ns propagation delay against system timing requirements before finalizing the schematic integration.

Part Context

This device belongs to the Texas Instruments SN74ALS family, which utilizes Advanced Low-power Schottky technology. The 'DR' suffix indicates the SOIC-16 surface-mount package variant. It serves as a logical alternative to through-hole DIP versions for modern automated assembly processes.

Replacement Considerations

The SN74ALS139N is a pin-compatible through-hole alternative. Verify package dimensions and thermal characteristics when substituting between surface-mount and leaded packages.