74ACT139SJX

Signal Switches, Multiplexers, Decoders Overview

The Fairchild Semiconductor 74ACT139SJX is a high-speed, dual 1-of-4 decoder/demultiplexer housed in a 16-SOIC package. It contains two independent decoders, each accepting two binary inputs to activate one of four outputs. The device operates within a supply voltage range of 2.0V to 3.6V and supports propagation delays as low as 8ns at 5V with 50pF load. It features low static current consumption of 2µA maximum and is designed for through-hole or surface-mount applications across an industrial temperature range of -40°C to 85°C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Dual independent 2-line-to-4-line decoding capability
• High-speed logic operation suitable for demanding timing applications
• Low power consumption with minimal static current draw
• Compatible with standard CMOS logic families

Signal Switches, Multiplexers, Decoders Applications

• Address decoding in memory systems
• Data distribution and demultiplexing circuits
• Control signal routing in embedded systems
• Industrial control panel interfaces

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific suffix SJX confirms the 16-SOIC package and tape-and-reel orientation if applicable. Confirm RoHS compliance status matches current regulatory requirements. Check for obsolescence notices from onsemi, the successor manufacturer. Ensure pinout compatibility with existing PCB footprints before integration. Validate operating voltage ranges against system power rails.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when dual independent decoding is required in a compact surface-mount form factor. Consider the ACT series speed and voltage characteristics for compatibility with 3.3V or 5V logic systems. Evaluate the SOIC package dimensions against available board space. Compare propagation delay specifications against system clock speeds to ensure timing margins are met.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74ACT family of high-speed CMOS logic devices. It serves as a functional equivalent to other dual decoder ICs like the 74LS139 but offers faster switching speeds and lower power consumption. The 74ACT139SJX variant specifically denotes the SOIC package configuration manufactured by Fairchild Semiconductor, now part of onsemi's portfolio.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Public confirmed substitutes include 74ACT139SCX and 74ACT139MX. Verify pinout compatibility and electrical specifications before substitution. Ensure the replacement part meets the same voltage and temperature requirements.