SN74HC42ANSR

Overview

The SN74HC42ANSR is a single 4-line to 10-line decoder manufactured by Texas Instruments within the HC logic series. It operates on a single power supply ranging from 2 V to 6 V and features ten active-low outputs that decode binary inputs into one-of-ten signals. The component utilizes an 8-pin SOIC surface-mount package, ensuring compatibility with automated assembly processes. It supports a wide operating temperature range from -40°C to +85°C and exhibits a propagation delay of 38 ns under standard load conditions.

Feature Summary

• Decodes four binary input lines to activate exactly one of ten active-low outputs based on the input code.
• Operates reliably across a broad voltage spectrum from 2 V to 6 V, supporting low-power system designs.
• Engineered for high-speed digital applications with a propagation delay of 38 ns at maximum supply voltage.

Applications

• Address decoding in microprocessor-based memory systems
• Control signal routing in industrial automation equipment
• Display driver interfaces requiring specific line activation

Procurement Notes

Verify the complete part number including the 'A' suffix and 'SR' tape-and-reel designation to ensure correct package and packaging format. Confirm RoHS compliance status and check for lead-free manufacturing certifications. Validate supplier authenticity through authorized distribution channels to prevent counterfeit components. Review datasheet specifications for electrical characteristics relevant to your specific circuit requirements before finalizing procurement.

Selection Notes

Select this component when a compact surface-mount solution is required for 4-to-10 line decoding functions. The HC series offers faster switching speeds compared to legacy LS variants while maintaining compatible pinouts. Ensure the design accommodates the 2 V to 6 V supply range and verify that the 8-pin SOIC footprint fits the PCB layout constraints. Consider the 38 ns propagation delay for timing-sensitive applications.

Part Context

This device belongs to the Texas Instruments SN74HC42 family of decimal decoders. It serves as a successor to older bipolar logic families, offering improved power consumption and noise immunity. The HC technology provides CMOS performance with standard TTL-compatible inputs, making it suitable for mixed-logic systems requiring reliable binary-to-decimal translation.

Replacement Considerations

SN74HC42DR: Identical functional logic but packaged in a 16-pin SOIC format instead of the 8-pin variant. SN74HC42N: Through-hole PDIP-16 alternative offering similar decoding capabilities for prototyping or manual assembly needs.