SN74LS251NSR

Overview

The SN74LS251NSR is an 8-line to 1-line multiplexer from the Texas Instruments LS series. It features complementary outputs and operates within a supply voltage range of 4.75 V to 5.25 V. The device utilizes a Low Power Schottky process for high-speed performance, with a typical propagation delay of 45 ns. It is housed in a 16-pin SOIC package and supports a maximum operating temperature of 70 °C.

Feature Summary

• Provides selection of one bit of data from up to eight sources
• Features on-chip select logic decoding
• Includes both assertion and negation outputs

Applications

• Universal function generator for four variables
• Data routing in digital systems
• Signal selection circuits

Procurement Notes

Verify the specific suffix 'NSR' against the manufacturer's current datasheet to confirm the tape-and-reel packaging configuration. Ensure the component meets the required RoHS compliance standards for your assembly process. Cross-reference the ordering information with official Texas Instruments documentation to validate availability and lead times.

Selection Notes

Select this component when an 8-input multiplexer with complementary outputs is required. The LS series offers a balance of speed and power consumption suitable for standard TTL applications. Consider the SOIC package size for surface-mount design constraints and verify that the 45 ns propagation delay meets the system timing requirements.

Part Context

This part belongs to the SN74LS251 family of 8-input multiplexers. It is designed for general-purpose digital logic applications requiring data selection. The LS series is characterized by its Low Power Schottky technology, which provides faster switching speeds than standard LS devices while maintaining lower power dissipation.

Replacement Considerations

Compatible substitutes include the SN74LS251D and SN74LS251J. Verify pinout compatibility and electrical specifications before substitution.