CD74HC126M

Overview

The CD74HC126M is a high-speed CMOS logic quad buffer with three-state outputs manufactured by Harris Corporation. It features four independent buffers, each with a dedicated output enable control input to manage data flow direction and prevent bus contention. The device operates within a wide voltage range of 2V to 6V and supports an operating temperature range from -55°C to 125°C. Packaged in a 14-pin Small Outline (SOIC) format, it provides symmetrical propagation delays and high noise immunity suitable for complex digital systems.

Feature Summary

• Quad buffer architecture with four independent non-inverting channels
• Three-state output capability controlled by dedicated enable inputs
• High-speed CMOS fabrication ensuring low power dissipation
• Wide operating voltage range supporting various logic families

Applications

• Bus-oriented memory and signal switching applications
• Clock drivers and buffering circuits
• Data acquisition systems requiring isolated signal paths
• Industrial control systems operating in extreme temperatures

Procurement Notes

Verify the manufacturer designation on the component marking, as Harris Corporation assets were acquired by Renesas Electronics. Ensure the package type matches the required SOIC-14 footprint. Confirm that the specific lot meets the -55°C to 125°C industrial temperature grade requirements for your application environment before integration.

Selection Notes

Select this component when a quad buffer with tri-state control is required for bus isolation. Compare against the MM74HC126MX from onsemi or CD74HCT126M if HCT logic compatibility is needed instead of HC. Verify that the 2V to 6V supply range aligns with the system's power rails and that the 14-pin SOIC package fits the PCB layout constraints.

Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices. It is functionally compatible with standard 74-series logic but offers improved speed and lower power consumption. The device serves as a fundamental building block for digital signal routing, providing isolation and drive capability between different sections of a circuit board.

Replacement Considerations

Public confirmed substitute part numbers include MM74HC126MX from onsemi and CD74HC126E from Texas Instruments. These alternatives share identical pinouts and logical functions. Verify that the replacement source maintains the same industrial temperature rating and package dimensions.