SN74LS257BD

Overview

The SN74LS257BD is a quadruple 2-line to 1-line data selector/multiplexer manufactured by Texas Instruments. It belongs to the SN74LS logic family and features four independent multiplexing circuits in a single package. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum propagation delay of 12 ns. It is housed in a 16-pin SOIC-Narrow (SOIC-16) surface-mount package. The component functions as a high-speed logic IC suitable for digital signal routing applications.

Feature Summary

• Integrates four independent 2-to-1 multiplexers for parallel data selection
• Provides high-speed switching capabilities with low propagation delay
• Compatible with standard TTL logic levels for broad system integration

Applications

• Digital data routing systems
• Address decoding circuits
• Signal path selection in instrumentation

Procurement Notes

Verify the specific suffix 'BD' corresponds to the SOIC-16 package and commercial temperature range when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors, as environmental declarations may vary by production batch. Ensure the supplier provides valid traceability for this Texas Instruments part number.

Selection Notes

Select this component when four independent 2-to-1 multiplexing channels are required in a compact surface-mount form factor. The LS series offers a balance of speed and power consumption suitable for general-purpose digital logic. Consider the SN74AS257D or SN74ALS257AN if higher speed performance is needed, noting that those variants belong to different logic families with distinct electrical characteristics.

Part Context

This part is part of the SN74xx series of logic integrated circuits, widely used in digital electronics for data handling tasks. The SN74LS257 specifically addresses the need for multiple small-scale multiplexing functions without requiring separate components for each channel, simplifying PCB layout and reducing component count in complex digital designs.

Replacement Considerations

The SN74AS257D and SN74ALS257AN are functional equivalents offering similar multiplexing capabilities but with improved speed specifications due to their AS and ALS logic families respectively. Verify pin compatibility and voltage requirements before substitution.