74AC139SJX

Signal Switches, Multiplexers, Decoders Overview

The onsemi 74AC139SJX is a dual 2-to-4 line decoder/demultiplexer belonging to the 74AC logic family. It features two independent decoders, each with two address inputs and four active-low outputs. The device operates within a supply voltage range of 2V to 6V and supports output drive currents of 24mA for both high and low states. It is housed in a 16-SOIC package and functions reliably across an operating temperature range of -40°C to +85°C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Contains two independent 2-to-4 line decoders or demultiplexers
• Provides active-low decoded outputs for precise signal selection
• Supports high-speed CMOS operation with significant output drive capability

Signal Switches, Multiplexers, Decoders Applications

• Address decoding for memory structures
• Chip select generation in digital systems
• Demultiplexing data streams to multiple destinations

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific suffix SJX against official datasheets to confirm package dimensions and marking details. Confirm RoHS compliance status as manufacturing processes evolve. Check for obsolescence notices from onsemi before finalizing procurement plans. Ensure compatibility with existing PCB footprints for the SOIC-16 package.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when dual independent decoding is required within a single package. The AC series offers higher speed than standard TTL equivalents while maintaining CMOS power efficiency. Verify that the 2V to 6V supply range aligns with the system's power architecture. Consider the 24mA output current for driving moderate loads directly.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the widely adopted 74AC logic family, known for balanced performance between speed and power consumption. The 74AC139 variant specifically addresses applications requiring multiple decoding channels without consuming excessive board space. It serves as a standard solution for legacy and modern digital interface designs.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Cross-reference with other manufacturers' 74AC139 variants such as those from Texas Instruments or Nexperia. Ensure pinout compatibility and electrical specifications match exactly. Verify package tolerance differences if replacing with non-onsemi sources.