MC74HC126AN

Overview

The MC74HC126AN is a quad 3-state non-inverting buffer manufactured by onsemi. It operates within a supply voltage range of 2.0 V to 6.0 V and features four independent output enables that are active-high. The device inputs are compatible with standard CMOS outputs, and with pull-up resistors, they interface with LSTTL outputs. Designed for bus-oriented systems, it provides high noise immunity characteristic of CMOS devices.

Feature Summary

• Four independent active-high output enables
• Directly interfaces to CMOS, NMOS, and TTL loads
• High noise immunity compliant with JEDEC Standard No. 7A
• Compatible with LS125 and LS126 pinouts

Applications

• Three-state memory address drivers
• Clock drivers
• Bus-oriented systems

Procurement Notes

Verify the specific package suffix against the datasheet ordering information to ensure correct physical dimensions and shipping format. Confirm RoHS compliance status and check for automotive-grade (-Q) variants if site-specific control changes are required. Validate lead temperature limits and moisture sensitivity levels prior to assembly.

Selection Notes

Select this component when an active-high enable signal is required for bus isolation. Ensure the operating voltage falls between 2.0 V and 6.0 V. Verify input compatibility requirements; use pull-up resistors if interfacing with LSTTL outputs. Consider the -Q suffix for applications demanding AEC-Q100 qualification and PPAP capability.

Part Context

This part belongs to the MC74HC125A/MC74HCT125A and MC74HC126A family of high-performance silicon-gate CMOS buffers. While functionally identical in logic to the HC125A, the HC126A distinguishes itself through its active-high output enable configuration, making it suitable for different bus control architectures.

Replacement Considerations

MC74HC126ADR2G

FAQ

How does the output enable logic differ from the MC74HC125A?

The MC74HC126A utilizes active-high output enables, whereas the MC74HC125A uses active-low output enables.

What is the maximum quiescent supply current at 6.0 V?

The maximum quiescent supply current is 160 µA at 6.0 V across the full operating temperature range.