CD74HC243M

Overview

The CD74HC243M is a high-speed CMOS logic quad-bus transceiver manufactured by Harris Corporation. It features non-inverting data transmission with three-state outputs, allowing for effective bus management in digital systems. The device operates within a supply voltage range of 2V to 6V and supports an output current of 7.8mA for both high and low states. Designed for robust performance, it functions reliably across an extended temperature range from -55°C to 125°C. The component is housed in a standard 14-pin Small Outline Integrated Circuit (SOIC) package, measuring 8.65 mm by 3.90 mm, suitable for surface-mount applications.

Feature Summary

• Provides four-bit bidirectional data transfer capability between buses
• Features three-state outputs to prevent signal contention on shared lines
• Utilizes high-speed CMOS technology for efficient power consumption
• Supports wide operating voltage and temperature ranges for industrial reliability

Applications

• Bus-oriented memory and command decoding systems
• Digital signal routing in complex electronic circuits
• I/O expansion interfaces requiring tri-state control

Procurement Notes

Verify RoHS compliance status as the CD74HC243M is documented as non-compliant. Confirm manufacturer origin, as Harris Corporation production may differ from Texas Instruments equivalents. Check part status for discontinuation or obsolescence before procurement. Ensure the SOIC-14 package matches your PCB footprint requirements. Validate that the specific lot meets your environmental operating conditions.

Selection Notes

Select this component when a quad-bus transceiver with three-state control is required for HC-series logic compatibility. Consider the 2V to 6V supply range suitability for your system design. Evaluate the -55°C to 125°C temperature rating against your operational environment. Compare the 7.8mA drive strength with load requirements. Verify the SOIC-14 package dimensions fit your assembly constraints.

Part Context

The CD74HC243M belongs to the 74HC series of high-speed CMOS logic devices. It serves as a functional equivalent to other quad-bus transceivers in the industry. Harris Corporation originally produced this variant, which shares electrical characteristics with Texas Instruments counterparts. The device is part of a broader family of bus drivers and receivers designed for general-purpose digital logic applications.

Replacement Considerations

CD74HC243DR is a compatible alternative offering similar electrical specifications. CD74HC243E provides equivalent functionality in a PDIP package. CD74HC243NSR is another surface-mount option with matching pinout and performance metrics.