CD74HCT126MT

Overview

The CD74HCT126MT is a high-speed CMOS logic quad buffer featuring three-state outputs, manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from -55°C to 125°C. The device utilizes a 14-pin Small Outline Integrated Circuit (SOIC) package with a lead pitch of 0.154 inches (3.90 mm). As part of the HCT series, it provides compatibility with standard TTL inputs while maintaining CMOS low power consumption characteristics.

Feature Summary

• Provides four independent unidirectional buffers with true output logic
• Features three-state outputs controlled by active-low enable signals
• Designed for high-speed digital applications using CMOS technology

Applications

• Bus-oriented memory and signal switching systems
• Clock drivers and buffer circuits
• Data acquisition systems requiring isolated signal paths

Procurement Notes

Verify the specific suffix 'M' or 'MT' against the manufacturer's current datasheet to confirm the package type and tape-and-reel configuration. Ensure the order matches the required RoHS compliance status and lead-free specifications as defined in the official component documentation. Cross-reference the ordering information with the authorized distributor's catalog to avoid discrepancies in packaging quantities or environmental certifications.

Selection Notes

Select this component when a quad buffer with three-state capability is required for bus driving applications. The HCT logic family ensures compatibility with TTL input levels while offering improved noise immunity compared to standard LS logic. Consider the SOIC package dimensions and thermal performance requirements relative to the PCB layout constraints and ambient operating conditions specified in the electrical characteristics table.

Part Context

This component belongs to the Texas Instruments CD74HCTxx series of high-speed CMOS logic devices. It is functionally similar to the CD74HC126 but optimized for TTL-compatible input thresholds. The device serves as a fundamental building block for digital signal routing, providing isolation and drive strength for multiple loads connected to shared data buses or control lines in complex electronic systems.

Replacement Considerations

Compatible substitutes include the CD74HC126MT for HC-series operation and the CD74HCT125M for active-high enable configurations. Verify pinout compatibility and electrical parameters such as propagation delay and output current before substitution.