CD74HCT251MT

Overview

The CD74HCT251MT is a high-speed CMOS logic component manufactured by Texas Instruments, functioning as an 8-input multiplexer with three-state outputs. It operates within a supply voltage range of 4.5 V to 5.5 V and supports data rates up to 30 MHz at 5 V. The device features low power consumption, with maximum quiescent current of 20 µA at 5 V. It is housed in a 16-pin Small Outline Integrated Circuit (SOIC) package with a standard .150-inch width. The operational temperature range extends from -55°C to +125°C, ensuring reliability in industrial environments.

Feature Summary

• Provides eight selectable data inputs routed to a single output based on address selection.
• Outputs are controlled by an enable input that allows for bus-oriented communication.
• CMOS technology ensures low static power dissipation while maintaining high noise immunity.

Applications

• Data routing in digital signal processing systems
• Address decoding in microprocessor-based designs
• Parallel-to-serial conversion circuits

Procurement Notes

Verify the specific suffix 'MT' indicates tape-and-reel packaging when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors. Check for lead-free designation if required by assembly standards. Ensure the ordering part number matches the exact package and reel specifications needed for automated placement equipment.

Selection Notes

Select this component when an 8-channel multiplexing function with three-state output control is required. The HCT series compatibility allows direct interfacing with TTL logic families. Consider the SOIC package dimensions for PCB layout constraints. Verify that the operating voltage and temperature ranges align with the system requirements before finalizing the design.

Part Context

This part belongs to the Texas Instruments CD74HCT family of high-speed CMOS logic devices. It is functionally equivalent to the industry-standard 74HCT251. The 'CD' prefix denotes commercial grade performance, while 'HCT' specifies High-speed CMOS with TTL-compatible input thresholds. This family is designed for applications requiring fast switching speeds with low power consumption.

Replacement Considerations

Compatible substitutes include CD74HC251M and CD74HCT251ME4. Verify pinout compatibility and electrical characteristics such as propagation delay and output drive strength. Ensure the replacement part meets the same package and environmental specifications.