SN74HC42DT

Overview

The SN74HC42DT is a high-speed CMOS decoder manufactured by Texas Instruments, belonging to the HC logic family. It features a 4-input to 10-output configuration, decoding binary inputs into one-of-ten active-low outputs. The device operates within a supply voltage range of 2 V to 6 V and exhibits a typical propagation delay of 38 ns. Designed for through-hole or surface-mount applications, it supports an operating temperature range from -40°C to +85°C. Packaged in a 16-pin SOIC (D) format, this component provides reliable digital decoding functionality for various logic circuit designs.

Feature Summary

• Implements 4-line to 10-line decoding with active-low output states
• Utilizes high-speed CMOS technology for efficient power consumption
• Supports wide supply voltage operation from 2 V to 6 V
• Ensures robust performance across extended industrial temperature ranges

Applications

• Address decoding in memory systems
• Control signal routing in digital logic circuits
• Display driver interface connections
• Peripheral selection in microcontroller-based systems

Procurement Notes

Verify that the ordering suffix corresponds to the SOIC package variant when sourcing replacements. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure compatibility with existing PCB footprint requirements for the 16-pin narrow body outline. Cross-reference thermal specifications against system constraints to maintain operational reliability under varying load conditions.

Selection Notes

Select this component when a 4-to-10 line decoding function is required within standard logic families. Consider the SN74HC42N for through-hole mounting needs instead of surface mount variants. Evaluate propagation delay characteristics against system timing requirements. Verify voltage levels match the target application's logic thresholds before finalizing the design choice.

Part Context

This part belongs to the SN74HC42 series of decoders produced by Texas Instruments. It serves as a surface-mount alternative to the PDIP-packaged SN74HC42N. The device shares functional equivalence with other members of the HC logic family while offering distinct packaging advantages for automated assembly processes. It complements broader decoder solutions within the company's integrated circuit portfolio.

Replacement Considerations

• SN74HC42N
• SN74HC42DR

FAQ

What is the logic state of the outputs?

The SN74HC42DT provides active-low outputs, meaning the selected output line goes low while others remain high.

Does the device include internal pull-up resistors?

No, the datasheet does not indicate internal pull-up resistors; external components may be required depending on the circuit design.