SN74HC42NS

Overview

The SN74HC42NS is a 4-to-10 line decoder manufactured by Texas Instruments, belonging to the HC logic family. It features four binary inputs and ten active-low outputs, designed to decode one of ten decimal states. The device operates within a supply voltage range of 2 V to 6 V and supports through-hole mounting in a PDIP-16 package. It exhibits a propagation delay of 38 ns and functions reliably across an industrial temperature range from -40 °C to +85 °C.

Feature Summary

• Decodes four binary input lines into one of ten active-low output states
• Operates with standard CMOS technology compatible with 2 V to 6 V power supplies
• Provides high noise immunity suitable for general-purpose digital applications

Applications

• Address decoding in microprocessor systems
• Control logic for memory selection
• Display driver circuits requiring single-line activation

Procurement Notes

Verify the specific suffix 'N' confirms the PDIP-16 through-hole package variant when sourcing. Confirm RoHS compliance status as required by project specifications. Ensure the ordering part number matches the exact manufacturer designation to avoid pinout or electrical characteristic mismatches during integration.

Selection Notes

Select this component when a single-channel 4-to-10 decoder is required in a through-hole format. The HC series offers balanced speed and power consumption compared to older TTL standards. Consider alternative packages like SOIC if surface-mount assembly is necessary for the target design.

Part Context

This decoder is part of the broader SN74HC42 series, which includes variants with different packaging options such as the DR (SOIC) and NE (PDIP) suffixes. All variants share identical logical functionality and electrical characteristics, differing primarily in physical form factor and mounting style for PCB layout flexibility.

Replacement Considerations

Direct functional equivalents include the SN74HC42DR and SN74HC42NE. Verify that substitute components maintain the same active-low output polarity and voltage compatibility before implementation.