SN74LS257BDR

Overview

The SN74LS257BDR is a quad 2-to-1 data selector/multiplexer from the Texas Instruments SN74LS series. It features four independent multiplexers with three-state outputs, housed in a 16-pin SOIC-Narrow package. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports surface-mount installation. It functions reliably across an operating temperature range of 0°C to +70°C, with a typical propagation delay of 21 ns.

Feature Summary

• Contains four independent 2-to-1 multiplexers for parallel data routing
• Provides three-state outputs to facilitate bus-oriented systems
• Compatible with standard TTL logic families

Applications

• Data routing in digital communication systems
• Bus-oriented memory addressing
• Signal selection in industrial control circuits

Procurement Notes

Verify the manufacturer marking matches Texas Instruments specifications. Confirm the package type is SOIC-Narrow-16 and the suffix 'DR' indicates reel packaging. Ensure the component meets RoHS requirements if applicable to your assembly process. Cross-reference the datasheet revision to confirm pinout consistency.

Selection Notes

Select this component when four independent 2-to-1 multiplexing channels are required with three-state output capability. It is suitable for designs needing compatibility with LS-TTL logic levels and standard 5V operation. Consider the SOIC-Narrow package for surface-mount applications where space efficiency is prioritized over through-hole mounting.

Part Context

This part belongs to the SN74LS257 family of quad multiplexers. It shares functional similarities with other variants like SN74LS257BN but differs in packaging and manufacturing origin. The LS series offers moderate speed and power consumption characteristics compared to faster or lower-power alternatives.