74ACT138SJX

Signal Switches, Multiplexers, Decoders Overview

The Fairchild Semiconductor 74ACT138SJX is a high-speed CMOS decoder/demultiplexer belonging to the 74ACT logic family. It features one circuit with three binary select inputs and eight active-low outputs, designed for memory decoding and data routing. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports surface-mount installation in a 16-SOP package. It functions reliably across an industrial temperature range from -40°C to +85°C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides one-of-eight decoding or demultiplexing functionality using three binary select inputs.
• Features buffered positive-edge-triggered clock inputs compatible with TTL logic levels.
• Includes three enable inputs (two active-low, one active-high) to simplify system expansion without external inverters.

Signal Switches, Multiplexers, Decoders Applications

• High-performance memory decoding systems
• Data transmission and routing applications
• Demultiplexing circuits requiring short propagation delays

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for specific environmental declarations such as REACH material reports. Review Product Change Notifications (PCNs) for any recent assembly origin or specification updates prior to final procurement decisions.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-compatible inputs are required alongside high-speed CMOS performance. Ensure the design accommodates the 4.5V to 5.5V supply voltage constraints. Verify that the 16-SOP surface-mount package fits the available PCB footprint and thermal management requirements for the target operating environment.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74ACT series of logic integrated circuits, which bridges the speed of Schottky TTL with the low power consumption of standard CMOS. The 74ACT138 specifically addresses applications needing fast decoding with minimal loading on driving circuits, making it suitable for complex digital systems requiring reliable signal routing.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct substitutes include the MC74ACT138SJX manufactured by onsemi, which shares identical pinouts and electrical characteristics. Other equivalents within the 74ACT138 family may be considered if package compatibility and functional specifications align with the original design requirements.