SN74HC42DR

Overview

The SN74HC42DR is a 4-line to 10-line decimal decoder/driver manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and features inverted outputs with a maximum low-level output current of 5.2 mA. The device utilizes a 16-pin SOIC package and supports surface-mount installation. It functions as a single circuit with four inputs and ten outputs, exhibiting a propagation delay of 38 ns at 6 V with a 50 pF load. The component is rated for an operating temperature range from -40°C to +85°C and complies with RoHS standards.

Feature Summary

• Converts four binary input lines into one of ten mutually exclusive active-low output states
• Operates on a single power supply ranging from 2 V to 6 V
• Provides standard push-pull outputs capable of driving 5.2 mA loads

Applications

• Address decoding in microprocessor systems
• Memory chip selection circuits
• Control logic for peripheral device activation

Procurement Notes

Verify the specific ordering suffix to confirm package type and tape/reel specifications. Ensure the procurement channel provides original manufacturer documentation or authorized distributor certification. Confirm RoHS compliance status matches project requirements. Check for any recent product change notifications that may affect pinout or electrical characteristics before finalizing orders.

Selection Notes

Select this component when a high-speed CMOS decoder with wide voltage compatibility is required. The HC series offers faster switching speeds compared to legacy LS variants while maintaining low static power consumption. Verify that the 16-SOIC package dimensions fit the available PCB footprint. Ensure the application does not require non-inverted outputs, as this device provides active-low signals.

Part Context

This part belongs to the SN74HC42 family of decimal decoders. It is designed for use in general-purpose digital logic applications requiring binary-to-decimal translation. The device is compatible with other components in the 74HC logic family, allowing for mixed logic system integration without level shifting issues under standard operating conditions.

Replacement Considerations

SN74HC42DRE4

FAQ

What is the logic state of the outputs?

The SN74HC42DR provides inverted (active-low) outputs. Only one output is low at a time corresponding to the binary input code.

How many independent circuits are contained in this package?

The device contains one independent 4-line to 10-line decoder circuit within the 16-pin SOIC package.