74ACT138SJ

Signal Switches, Multiplexers, Decoders Overview

The onsemi 74ACT138SJ is a high-speed 1-of-8 decoder/demultiplexer belonging to the 74ACT logic family. It accepts three binary weighted address inputs (A0, A1, A2) and provides eight mutually exclusive active-LOW outputs (O0-O7). The device operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from -40°C to +85°C. It features TTL-compatible inputs and includes multiple input enables for parallel expansion capabilities.

Signal Switches, Multiplexers, Decoders Feature Summary

• Features multiple input enables allowing easy parallel expansion to larger decoding configurations
• Provides demultiplexing capability by utilizing enable inputs as data or strobe signals
• Outputs are active-low and mutually exclusive to ensure precise signal selection
• Includes TTL compatible inputs for direct interfacing with standard logic families

Signal Switches, Multiplexers, Decoders Applications

• High-speed bipolar memory chip select address decoding
• Parallel expansion to 1-of-24 or 1-of-32 decoder systems
• Demultiplexing applications using enable inputs as data paths

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific package suffix against the datasheet ordering information to confirm physical dimensions and shipping quantities. Confirm RoHS compliance status and lead times directly with authorized distributors, as availability varies by region and production lot.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-compatible inputs are required alongside AC speed performance. Ensure the design utilizes the specified 4.5 V to 5.5 V supply range. Consider the multiple enable pins for system architecture flexibility regarding expansion and demultiplexing requirements.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74AC/ACT138 series of decoders manufactured by onsemi. It shares functional similarities with the 74AC138 but distinguishes itself through TTL-compatible input thresholds. The series is designed for high-speed digital logic applications requiring efficient address decoding.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The MC74ACT138DR2G serves as a verified alternative within the same logic family. Verify pinout compatibility and package dimensions before substitution.