SN74LS251N

Overview

The SN74LS251N is an 8-line to 1-line multiplexer from the Texas Instruments LS logic series. It features complementary outputs and a 3-state capability, housed in a 16-pin PDIP package. Key electrical parameters include a maximum propagation delay of 45 ns, a maximum supply current (ICC) of 62 mA, and a load capacitance (CL) of 50 pF. The device operates within a temperature range up to 70 °C.

Feature Summary

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

Applications

• Universal function generator for four-variable logic functions
• Data routing in digital systems
• Signal selection in multiplexed architectures

Procurement Notes

Verify the specific suffix against official datasheets to confirm package type and temperature grade. Ensure compatibility with existing TTL/LS logic levels and power supply requirements. Confirm availability through authorized distributors as standard stock levels vary. Check for any recent obsolescence notices or lifecycle status updates from the manufacturer before finalizing procurement plans.

Selection Notes

Select this component when an 8-to-1 multiplexer with complementary outputs is required within the LS logic family. Consider the 45 ns propagation delay and 62 mA supply current limits during system design. Verify that the 16-pin DIP package fits the target PCB layout constraints. Ensure the operating voltage range aligns with the system's 5 V supply specifications.

Part Context

This part belongs to the Texas Instruments SN74LS251 series, which are high-speed 8-input digital multiplexers. The LS series utilizes Schottky process technology for improved speed and lower power consumption compared to standard TTL. These devices are designed for general-purpose data selection and logic function generation applications.

Replacement Considerations

Compatible substitutes include SN74LS251J and SN74LS251N variants from other manufacturers adhering to the same pinout and electrical specifications.