74ACT138PC

Signal Switches, Multiplexers, Decoders Overview

The onsemi 74ACT138PC 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 features TTL-compatible inputs. It 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 source and sink up to 24 mA with active-low mutually exclusive states

Signal Switches, Multiplexers, Decoders Applications

• High-speed bipolar memory chip select address decoding
• Parallel expansion to 1-of-24 or 1-of-32 decoders
• General-purpose 1-of-8 decoding applications

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific package type and suffix against official documentation, as standard datasheets list SOIC-16 and TSSOP-16 variants. Confirm RoHS compliance status and ensure the ordering code matches the required shipping format such as rail or tape and reel specifications provided in the manufacturer's ordering information section.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-compatible inputs are required alongside AC speed performance. Ensure the application utilizes a 4.5 V to 5.5 V supply voltage. Consider the device's ability to function as a demultiplexer if enable pins are repurposed for data routing rather than standard decoding operations.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74AC/ACT138 series of dual 1-of-8 decoders manufactured by onsemi. The ACT variant specifically offers TTL-compatible input thresholds while maintaining the high-speed characteristics associated with the AC logic family. It serves as a fundamental building block for address decoding in digital systems.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct substitutes include the Texas Instruments CD74ACT138M96 and the onsemi MC74ACT138DR2G. Verify pinout compatibility and electrical characteristics before substitution.