MC74HC125AFL1

Overview

The MC74HC125AFL1 is a quad buffer and line driver from the HC logic family, manufactured by onsemi. It features four non-inverting outputs with three-state capability, housed in a 14-SOIC package. The device operates within a supply voltage range of 2 V to 6 V. Key electrical parameters include a high-level output current of -7.8 mA and a low-level output current of 7.8 mA. Static current is specified at 4 uA, with a maximum power dissipation of 450 mW. Propagation delay varies from 90 ns at 2 V to 15 ns at 6 V. It supports an operating temperature range from -55°C to +125°C.

Feature Summary

• Provides four independent non-inverting buffers with three-state outputs for bus-oriented systems.
• Compatible with standard CMOS outputs and LSTTL outputs when pull-up resistors are used.
• Features low input current to minimize loading effects on preceding circuits.

Applications

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

Procurement Notes

Verify the specific suffix FL1 confirms the 14-SOIC package configuration. Ensure the order matches the HC series requirements rather than HCT or VHC variants. Confirm RoHS compliance status through official documentation. Check for any automotive-grade (-Q) distinctions if reliability standards differ. Validate pinout compatibility with LS125 equivalents for direct replacement scenarios.

Selection Notes

Select this component for designs requiring wide voltage operation between 2 V and 6 V. It serves as a drop-in replacement for LS125 devices due to identical pinouts. Consider propagation delay specifications relative to system clock speeds. Evaluate thermal performance given the 450 mW power dissipation limit in the SOIC package. Ensure interface compatibility with downstream CMOS or TTL loads.

Part Context

This part belongs to the MC74HC125A family of quad buffers. It shares functional similarities with the MC74HC126A, differing primarily in enable polarity. The HC series offers higher speed and lower power consumption compared to legacy LS logic families while maintaining compatible pinouts.

Replacement Considerations

MC74HC125ADTR2G (TSSOP-14 package)

FAQ

How does the MC74HC125AFL1 interface with LSTTL outputs?

It interfaces with LSTTL outputs by utilizing external pull-up resistors on the inputs, as the HC series inputs are not inherently compatible without this addition.

What is the enable logic for the MC74HC125AFL1?

The enable inputs are active-low, meaning the outputs are enabled when the enable signal is at a low logic level.