SN74LS251NG4

Overview

The SN74LS251NG4 is an 8-line to 1-line multiplexer from the Texas Instruments LS series. It features a ceramic DIP-16 package with complementary outputs and 3-state capability. Key electrical parameters include a maximum propagation delay of 45 ns, a load capacitance of 15 pF, and a maximum supply current of 10 mA. The device operates within a voltage range up to 5.25 V and supports temperatures from 0 °C to 70 °C.

Feature Summary

• Provides high-speed data selection from eight input sources to a single output using Low Power Schottky technology.
• Features on-chip select logic decoding for simplified address control without external components.
• Offers both assertion and negation outputs with 3-state capability for bus-driven applications.

Applications

• Universal function generator for logic functions of four variables
• Data routing in digital communication systems
• Address decoding in memory architectures

Procurement Notes

Verify the specific suffix 'G4' against the manufacturer's official documentation to confirm RoHS compliance status and material composition. Ensure the ordering part number matches the exact package variant required for your design. Cross-reference the datasheet revision date to validate all electrical specifications before finalizing procurement.

Selection Notes

Select this component when designing circuits requiring an 8-to-1 multiplexer with low power consumption and high speed. The LS series offers a balance between performance and power dissipation suitable for standard TTL logic environments. Consider the complementary output availability if both true and inverted signals are needed simultaneously.

Part Context

This component belongs to the Texas Instruments SN74LS family, which utilizes Low Power Schottky technology. This family is designed to provide improved speed-power product compared to standard LS logic. The SN74LS251 specifically addresses applications requiring multi-channel data selection with tri-state output control.

Replacement Considerations

Compatible substitutes include the SN74LS251N (plastic DIP) and SN74LS251D (SOIC). Verify pinout compatibility and package dimensions before substitution. Other manufacturers offer equivalent parts under the generic 74LS251 designation.