MC74HC125ADTG

Overview

The MC74HC125ADTG is a quad 3-state noninverting 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 output enables that are active-low. The device utilizes TSSOP-14 packaging with a 0.65 mm pitch. Key electrical characteristics include a maximum propagation delay of 90 ns at 2.0 V, decreasing to 15 ns at 6.0 V. It supports an output drive capability of 15 LSTTL loads and maintains low input current of 1.0 μA.

Feature Summary

• Provides four independent noninverting buffers with active-low output enable control for bus-oriented systems.
• Ensures high noise immunity characteristic of CMOS devices while maintaining compatibility with standard CMOS outputs.
• Supports direct interfacing to CMOS, NMOS, and TTL loads without requiring additional pullup resistors.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'DTG' corresponds to the TSSOP-14 package and tape & reel shipping configuration as listed in the official onsemi ordering information table. Confirm RoHS compliance and Pb-free status requirements against project specifications before finalizing procurement orders.

Selection Notes

Select this component when designing circuits requiring quad buffering with active-low enable signals. Ensure the operating voltage remains between 2.0 V and 6.0 V. Consider the HC series for broader voltage flexibility compared to HCT variants, which are restricted to 4.5 V to 5.5 V operation.

Part Context

This part belongs to the MC74HC125A/MC74HCT125A family, sharing pinouts with LS125 equivalents. It is designed for high-performance silicon-gate CMOS applications. The datasheet also covers related variants like MC74HC126A (active-high enables) and MC74HCT125A (TTL-compatible inputs).

Replacement Considerations

MC74HC126ADTR2G shares the same package but uses active-high enables. MC74HCT125ADTR2G offers TTL-compatible inputs but restricts voltage to 4.5–5.5 V. Cross-reference exact pinout and enable polarity requirements before substitution.

FAQ

What is the logic state of the output enables?

The output enables for the MC74HC125A are active-low, meaning the outputs are enabled when the OE pin is at a logic low level.

How does the input compatibility differ from the HCT variant?

The HC125A inputs are compatible with standard CMOS outputs, whereas the HCT125A inputs are compatible with both standard CMOS and TTL outputs.