CD74HC251M

Overview

The CD74HC251M is a high-speed CMOS logic integrated circuit manufactured by Harris Corporation, functioning as an 8-input multiplexer. It features a single circuit configuration with one output and three-state output capability. The device operates on a single power supply ranging from 2V to 6V. It is housed in a 16-SOIC surface-mount package with a width of 0.154 inches (3.90mm). The component supports an operating temperature range from -55°C to 125°C.

Feature Summary

• Provides 8-to-1 data selection functionality within a single channel architecture
• Features three-state outputs for effective bus line driving and isolation
• Utilizes high-speed CMOS technology compatible with standard logic families

Applications

• Data routing and signal selection in digital systems
• Bus-oriented transmission applications requiring tri-state control
• Parallel-to-serial conversion circuits

Procurement Notes

Verify the manufacturer origin carefully, as Texas Instruments acquired Harris Semiconductor assets. Confirm whether the specific unit is an original Harris production or a TI continuation, noting that TI lists this part as obsolete. Ensure the package dimensions match the specified 16-SOIC form factor and validate the voltage and temperature ratings against system requirements before procurement.

Selection Notes

Select this component when an 8-channel multiplexer with tri-state output is required in a surface-mount design. Consider the 2V to 6V supply range and industrial temperature capabilities. Verify compatibility with the target logic family voltage levels. Note that the part is discontinued; evaluate alternative sources or newer equivalents if long-term availability is critical for the project lifecycle.

Part Context

This component belongs to the 74HC series of high-speed CMOS logic devices. Originally produced by Harris Corporation, manufacturing rights were transferred to Texas Instruments following their acquisition of Harris's semiconductor division. The CD74HC251M represents a legacy product within this extensive logic family, characterized by its specific multiplexing function and SOIC packaging.

Replacement Considerations

Texas Instruments lists the CD74HC251M as obsolete. Potential substitutes include the CD74HC251MT and CD74HC251M96. Verify pinout compatibility and electrical specifications before substituting.