SN74ALS251DR

Signal Switches, Multiplexers, Decoders Overview

The SN74ALS251DR is an Advanced Low-Power Schottky (ALS) series 8-line to 1-line multiplexer manufactured by Texas Instruments. It features three-state outputs and complementary logic functions within a 16-pin SOIC surface-mount package. The device operates with a supply voltage range of 4.5 V to 5.5 V, drawing a maximum supply current of 10 mA. Key electrical characteristics include a propagation delay of 15 ns and a load capacitance of 15 pF. It supports a wide operating temperature range from 0 °C to +70 °C, ensuring reliable performance in standard commercial environments.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides high-speed data selection with a propagation delay of 15 ns for efficient signal routing.
• Features three-state outputs allowing direct bus connection without external buffers.
• Utilizes Advanced Low-Power Schottky technology to balance speed and power consumption.
• Offers complementary output configurations for versatile logic interfacing.

Signal Switches, Multiplexers, Decoders Applications

• High-speed data routing in digital communication systems
• Address decoding and memory selection in microprocessor-based designs
• Signal switching in test and measurement equipment

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix 'DR' confirms the tape-and-reel packaging format and SOIC-16 package type. Ensure compatibility with 3.3 V or 5 V logic families if level shifting is required, as this component is specified for 5 V operation. Confirm that the ALS series availability aligns with long-term procurement strategies, considering potential obsolescence trends in legacy logic families.

Signal Switches, Multiplexers, Decoders Selection Notes

Select the SN74ALS251DR when design requirements demand faster switching speeds than standard LS series components while maintaining lower power dissipation than standard ALS variants. The surface-mount SOIC package is suitable for automated assembly processes. Consider the complementary output feature if inverted signals are needed without additional inverters. Verify that the 15 ns delay meets the system timing constraints.

Signal Switches, Multiplexers, Decoders Part Context

This component belongs to the Texas Instruments SN74ALS family, which represents an evolution of the standard 74LS logic series. The ALS technology offers improved speed-power product, making it suitable for applications requiring moderate speed with reduced power consumption compared to earlier generations. The SN74ALS251 specifically addresses multiplexing needs within this high-performance logic ecosystem.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct functional substitutes include the SN74ALS251N (DIP package) or SN74ALS251NSR (SOIC reel). For pin-compatible alternatives with similar performance, consider the SN74HC251 or SN74HCT251, though voltage levels and drive strengths may differ. Verify that any replacement maintains the three-state output capability and compatible input thresholds.