CD74HC42M

Overview

The CD74HC42M is a high-speed CMOS logic decoder manufactured by Texas Instruments. It functions as a 4-line to 10-line decoder/demultiplexer within the HC series. The device accepts four binary inputs and activates one of ten active-low outputs corresponding to the input code. It operates on a single power supply ranging from 2 V to 6 V. The component is housed in a 16-pin SOIC surface-mount package. It supports an operating temperature range from -55 °C to +125 °C, ensuring reliability in industrial environments.

Feature Summary

• Provides decoding functionality for four binary inputs into ten distinct active-low output lines
• Utilizes high-speed CMOS technology compatible with standard 5-V CMOS logic levels
• Features wide power supply operation capability across low voltage ranges
• Designed for robust performance under extended industrial temperature conditions

Applications

• Address decoding in microprocessor-based systems
• Data routing and demultiplexing in digital circuits
• Control signal generation for peripheral devices
• Memory selection logic in embedded systems

Procurement Notes

Verify the specific suffix 'M' indicates the SOIC-16 package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors. Ensure the ordering part number matches the required pin configuration and thermal specifications for your application design.

Selection Notes

Select this component when a 4-to-10 decoding function is required in a space-constrained surface-mount design. Compare propagation delay characteristics against system timing requirements. Consider the active-low output polarity if interfacing with loads requiring active-high signals. Evaluate the SOIC-16 footprint availability against PCB layout constraints.

Part Context

This decoder belongs to the SN/CD74HCxx family of high-speed CMOS logic devices. It shares functional similarities with other decoders like the SN74HC42 but differs in packaging and specific manufacturing revisions. The HC series offers faster switching speeds compared to legacy LS logic families while maintaining CMOS power efficiency.

Replacement Considerations

Direct replacements include the SN74HC42N for through-hole applications or the SN74HC42DR for SOIC packages. Verify pin compatibility and electrical parameters before substitution. Cross-reference with equivalent parts from other manufacturers only if datasheet specifications align precisely.