SN74LS251NS

Overview

The SN74LS251NS is an 8-line to 1-line multiplexer from the Texas Instruments LS series, housed in a 16-pin DIP package. It features complementary outputs and operates within a supply voltage range of 4.75 V to 5.25 V. The device provides a propagation delay of 45 ns and draws a maximum supply current of 10 mA. It functions as a high-speed digital multiplexer with three-state outputs.

Feature Summary

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

Applications

• High-speed digital data routing
• Universal function generator for four variables
• Data selector systems requiring complementary outputs

Procurement Notes

Verify the specific suffix 'NS' against official Texas Instruments documentation to confirm the exact package type and temperature rating. Ensure compatibility with standard TTL logic levels and 5V power supplies. Confirm availability status directly with authorized distributors as component lifecycles may vary.

Selection Notes

Select this component when an 8-input multiplexer with complementary outputs is required. It is suitable for applications needing high-speed switching within standard TTL voltage ranges. Consider the LS series characteristics for low power consumption relative to standard TTL while maintaining adequate speed.

Part Context

This part belongs to the SN74LS251 family of 8-input multiplexers. It is designed for use in digital logic circuits where data selection from multiple sources is necessary. The LS series offers a balance of speed and power efficiency suitable for general-purpose logic applications.

Replacement Considerations

Compatible substitutes include other 74LS251 variants from different manufacturers such as ON Semiconductor or Fairchild, provided they meet the same electrical specifications and pinout requirements.