SN74LS251D

Overview

The SN74LS251D is an 8-line to 1-line multiplexer from the LS series, manufactured by Texas Instruments. It features complementary outputs and operates within a supply voltage range of 4.75 V to 5.25 V. The device utilizes a Schottky process for high-speed performance, with a maximum 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 selector applications
• Digital multiplexing systems

Procurement Notes

Verify the manufacturer designation carefully, as the SN74LS251D part number is also associated with Motorola/NXP in public databases. Confirm that the specific unit received matches the Texas Instruments specification sheet regarding pinout and electrical characteristics before integration into the design.

Selection Notes

Select this component when an 8-input multiplexer with low-power Schottky speed is required. Ensure the application environment remains within the specified 0 °C to 70 °C temperature range. Verify compatibility with standard TTL logic levels and confirm that the SOIC-16 package fits the available PCB footprint constraints.

Part Context

This device belongs to the SN74LS251 family of digital multiplexers. It shares functional similarities with other 74LS series components but is distinct in its 8-to-1 configuration and complementary output structure. It serves as a core building block for complex digital signal routing and logic generation tasks.

Replacement Considerations

Public confirmed substitute part numbers: SN74LS251J, SN74LS253DR.