MC74HC125AF

Overview

The MC74HC125AF is a high-performance silicon-gate CMOS quad three-state non-inverting buffer manufactured by onsemi. It features four independent outputs with active-low enable controls, designed for bus-oriented systems such as memory address drivers and clock distribution. The device operates within a supply voltage range of 2.0 to 6.0 V and exhibits low input current of 1.0 μA. It provides output drive capability for 15 LSTTL loads and ensures direct interface compatibility with CMOS, NMOS, and TTL logic families while maintaining high noise immunity compliant with JEDEC Standard No. 7A.

Feature Summary

• Quad three-state non-inverting buffering architecture with independent active-low output enables
• Broad operating voltage adaptability ranging from 2.0 V to 6.0 V for diverse power environments
• High noise immunity characteristics ensuring stable operation in electromagnetically noisy conditions

Applications

• Three-state memory address drivers
• Clock signal distribution systems
• Bus-oriented digital circuit interfaces

Procurement Notes

Verify the specific suffix 'AF' against the official datasheet to confirm package type and tape/reel specifications. Ensure the active-low enable configuration matches the system design requirements. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer before finalizing procurement plans.

Selection Notes

Select this component when a quad buffer with three-state control is required for bus architectures. The HC series offers wide voltage tolerance compared to HCT variants. Verify that the active-low enable polarity aligns with the control logic. Consider pinout compatibility with legacy LS125 designs if migrating existing circuits.

Part Context

This part belongs to the 74HC family of high-speed CMOS logic devices. It serves as a modern replacement for older LS125 components, offering improved speed and lower power consumption while maintaining compatible pinouts. The device integrates 72 FETs or 18 equivalent gates to perform buffering functions in complex digital systems.

Replacement Considerations

The MC74HC126A is a functional substitute with identical pinout but utilizes active-high output enables instead of active-low. Cross-reference other manufacturers' 74HC125 equivalents for package availability if the original source is discontinued.