MC74HC125ADT

Overview

The MC74HC125ADT is a quad 3-state non-inverting buffer manufactured by onsemi in the HC logic series. It operates within a supply voltage range of 2.0 V to 6.0 V and features four independent outputs with active-low enable inputs. The device provides an output drive capability of 7.8 mA at both high and low states, with a maximum quiescent current of 160 µA. Propagation delay varies from 90 ns at 2.0 V to 15 ns at 6.0 V. It is housed in a TSSOP-14 package and supports an operating temperature range from -55°C to +125°C.

Feature Summary

• Provides four independent non-inverting buffers with active-low output enables for bus-oriented systems
• Compatible with standard CMOS outputs and LSTTL outputs when pull-up resistors are used
• Features high noise immunity characteristic of CMOS devices and compliance with JEDEC standards

Applications

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

Procurement Notes

Verify that the ordering suffix matches the required package type, as the 'DT' suffix specifically denotes the TSSOP-14 configuration. Confirm RoHS compliance and lead-free status if environmental regulations apply to the assembly process. Ensure the specific revision level aligns with design requirements, noting that datasheet revisions may update ESD ratings or other electrical characteristics over time.

Selection Notes

Select this component when a quad buffer with active-low control is required for interfacing between different logic families. The wide operating voltage range allows flexibility in power supply design. Consider the propagation delay specifications relative to the system clock speed to ensure signal integrity. Verify input compatibility requirements against the driving source logic family.

Part Context

This part belongs to the MC74HC125A/MC74HCT125A/MC74HC126A family of high-performance silicon-gate CMOS buffers. It shares pinout compatibility with LS125 and LS126 devices, facilitating direct replacements in existing designs. The HC variant offers a wider voltage range compared to the HCT version, which is restricted to 4.5 V to 5.5 V operation.

Replacement Considerations

MC74HC126ADT serves as a functional alternative with identical pinout but utilizes active-high output enables instead of active-low.