CD74HC243M

Overview

The CD74HCT243M is a high-speed CMOS logic device functioning as a non-inverting octal buffer and line driver with three-state outputs. Manufactured by Texas Instruments, this component operates within a supply voltage range of 4.5 V to 5.5 V. It features two active-low output enables for precise control over data transmission. The device utilizes a 20-pin Small Outline Integrated Circuit (SOIC) package, suitable for surface-mount applications across an extended industrial temperature range from -55 °C to +125 °C.

Feature Summary

• Octal configuration providing eight independent non-inverting buffer channels
• Three-state output capability allowing multiple drivers on shared buses
• Dual active-low output enable inputs for flexible control logic
• High-speed CMOS technology ensuring low power consumption

Applications

• Bus-oriented memory and register architectures
• Clock drivers and buffering circuits
• Bidirectional data bus transceivers
• Industrial control system signal conditioning

Procurement Notes

Verify the specific suffix 'M' indicates the SOIC-20 package variant when sourcing. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer. Ensure the procurement order matches the exact part number to avoid confusion with similar HC or HCT series variants that may have different electrical characteristics or pinouts.

Selection Notes

Select this component when an octal buffer with three-state outputs is required for bus systems. The HCT series compatibility allows direct interfacing with TTL logic levels while maintaining CMOS noise immunity. Consider the 20-pin SOIC package constraints for PCB layout. Verify that the operating voltage range aligns with the system's 5 V power supply requirements.

Part Context

This device belongs to the Texas Instruments 74HC and 74HCT logic families, which are widely used in digital electronics for signal buffering and driving. The 74HCT variant specifically offers TTL-compatible input thresholds, facilitating integration with legacy systems. The octal configuration makes it suitable for parallel data transfer applications requiring high fan-out capabilities.

Replacement Considerations

Check for equivalent parts such as the SN74HCT243 or other manufacturers' octal buffers with three-state outputs. Ensure pinout compatibility and electrical specifications match before substitution. Verify package dimensions if replacing with a different manufacturer's component.