SN74HC257DBR

Overview

The SN74HC257DBR is a Texas Instruments logic component belonging to the HC series. It functions as a quad 2-to-1 data selector/multiplexer with three-state outputs. The device operates within a supply voltage range of 2 V to 6 V and supports a propagation delay of 25 ns. It is housed in a 16-pin SOIC-Narrow package and is rated for an operating temperature range from -40 °C to +85 °C.

Feature Summary

• Contains four independent 2-to-1 multiplexers controlled by shared select inputs
• Features three-state outputs that prevent loading on bus systems when disabled
• Provides high noise immunity and low power consumption typical of CMOS technology

Applications

• Data routing in digital communication systems
• Bus-oriented architectures requiring signal selection
• General-purpose digital logic applications

Procurement Notes

Verify the specific suffix 'D' confirms the SOIC-Narrow 16-pin surface-mount package configuration. Confirm the 'B' or absence thereof indicates standard commercial grade specifications. Ensure the order matches the exact manufacturer part number to guarantee compatibility with intended circuit designs and environmental ratings.

Selection Notes

Select this component for designs requiring multiple independent data paths with shared control signals. The wide supply voltage range allows flexibility in system power architecture. Verify that the 25 ns propagation delay meets the timing requirements of the target application speed.

Part Context

This part is part of the SN74HC257 family, which includes variants with different packaging options such as PW (TSSOP) and DR (SOIC). These devices are designed for general-purpose digital applications where reliable data selection and low power operation are required.

Replacement Considerations

Compatible substitutes include SN74HC257DR and SN74HC257PW. Verify pinout and electrical characteristics match before substitution.