CD74HCT125E

Overview

The CD74HCT125E is a high-speed CMOS logic device from Texas Instruments, functioning as a quadruple bus buffer with three-state outputs. It operates within a supply voltage range of 4.5 V to 5.5 V and supports unidirectional data flow. The component features four independent channels, each equipped with an active-low enable control input. Designed for surface-mount or through-hole integration via a 14-pin DIP package, it ensures signal integrity in digital systems.

Feature Summary

• Provides four independent non-inverting buffer channels for signal driving
• Features three-state outputs allowing connection to shared buses without interference
• Utilizes HCT logic technology for compatibility with TTL-driven interfaces
• Includes active-low enable inputs to manage data transmission timing

Applications

• Bus-oriented memory and address driver circuits
• Clock drivers and buffering for high-speed signaling
• Transitioning impedance between different logic families
• I/O port expansion in microcontroller systems

Procurement Notes

Verify the specific suffix 'E' indicates the PDIP-14 package configuration. Confirm RoHS compliance status as manufacturing standards evolve. Check current lifecycle status since older HCT variants may face obsolescence. Ensure the source document explicitly lists this part number to avoid confusion with similar SN74 series equivalents.

Selection Notes

Select this component when interfacing 5V CMOS logic with TTL-compatible devices requiring standard drive strength. The HCT series offers noise immunity suitable for industrial environments. Consider the DIP-14 form factor for prototyping or legacy board designs where surface-mount options are unavailable.

Part Context

This device belongs to the Texas Instruments CD74HCT family of high-speed CMOS logic. It shares functional similarities with the SN74HCT125 but may differ in packaging or specific manufacturing revisions. The HCT series bridges the gap between HC logic speed and TTL input compatibility, making it a standard choice for mixed-voltage digital applications.

Replacement Considerations

SN74HCT125N: Direct functional equivalent in PDIP-14 package. CD74HC125E: Similar function but uses HC logic which requires higher input voltage thresholds than HCT.