SN74HCS251DR

Overview

The SN74HCS251DR is an automotive-grade 8-to-1 line data selector/multiplexer from Texas Instruments, belonging to the HCS logic family. It features eight data inputs and a single output, controlled by three address lines. The device operates within a supply voltage range of 2 V to 6 V and supports surface-mount installation in a TSSOP-16 package. It exhibits a propagation delay of 20 ns and functions reliably across an extended temperature range from -40°C to +125°C.

Feature Summary

• Automotive qualification compliant with AEC-Q100 standards for robust performance in vehicle environments
• High-speed signal routing capability enabled by low propagation delay characteristics
• Wide operating voltage flexibility supporting systems ranging from 2 V to 6 V
• Extended thermal stability ensuring reliable operation under high ambient temperatures

Applications

• Automotive infotainment system data routing
• Vehicle body control module signal selection
• Industrial automation multiplexing interfaces

Procurement Notes

Verify that the specific part number suffix matches the required package type and tape-and-reel specifications for your assembly process. Confirm that the component holds valid AEC-Q100 certification if deployed in automotive applications. Cross-reference the datasheet revision history to ensure compatibility with existing design constraints and environmental compliance requirements.

Selection Notes

Select this component when designing circuits requiring high-speed multiplexing within automotive or industrial sectors. The HCS series offers superior speed compared to standard HC logic while maintaining low power consumption. Ensure the design accommodates the specified 2 V to 6 V supply range and utilizes appropriate decoupling capacitors near the power pins to maintain signal integrity at higher frequencies.

Part Context

This device is part of the SN74HCS251 series, which provides 8-to-1 multiplexing functionality. It shares functional similarities with the SN74HC151 but differs in logic family characteristics, offering faster switching speeds and automotive-grade reliability. The DR suffix indicates a TSSOP-16 surface-mount package, distinguishing it from through-hole or other surface-mount variants within the same logical family.

Replacement Considerations

The SN74HC151DR serves as a non-automotive grade alternative with similar pinout and logic function, though it lacks AEC-Q100 qualification and exhibits slower propagation delays.