74ACT139SJ

Signal Switches, Multiplexers, Decoders Overview

The Fairchild Semiconductor 74ACT139SJ is a dual 2-line-to-4-line decoder/demultiplexer from the ACT series. It features inverted outputs and operates within a supply voltage range of 4.5V to 5.5V. The device utilizes a 16-pin Small Outline (SOIC) package with a maximum height of 1.75 mm. It supports an operating temperature range of -40°C to 85°C and exhibits a propagation delay of 10.5 ns at 5V with a 50 pF load.

Signal Switches, Multiplexers, Decoders Feature Summary

• Contains two independent 2-line-to-4-line decoders or demultiplexers
• Provides inverted logic outputs for signal routing
• Features buffered positive edge-triggered clock inputs

Signal Switches, Multiplexers, Decoders Applications

• Address decoding in microprocessor systems
• Demultiplexing data streams in digital circuits
• Memory chip select generation

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific suffix SJ corresponds to the SOIC-16 package variant when sourcing. Confirm RoHS compliance status as manufacturing specifications may vary by production batch. Ensure the component meets the required operating temperature range for your specific application environment before finalizing procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when high-speed CMOS performance is required with TTL-compatible input levels. The ACT series offers reduced power consumption compared to standard LS logic while maintaining faster switching speeds. Verify that the 16-pin SOIC footprint aligns with your PCB layout constraints and assembly capabilities.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74ACT family, which combines the speed of AC logic with the low power consumption of ACT technology. It serves as a functional equivalent to other 2-to-4 line decoders but provides enhanced performance characteristics suitable for modern digital designs requiring precise timing and reliable signal integrity.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible substitutes include the 74AC139SC and 74HC139 variants. Verify pin compatibility and electrical parameters such as propagation delay and output drive current before substitution.