MC74ACT125NG

Overview

The MC74ACT125NG is a quad 3-state buffer manufactured by onsemi, utilizing high-performance silicon-gate CMOS technology. It operates within a supply voltage range of 4.5 V to 5.5 V and features TTL-compatible inputs. The device provides four non-inverting channels with low-enable control, capable of sourcing or sinking up to 24 mA per output. It is available in SOIC-14 and TSSOP-14 packages, designed for surface-mount applications across an operating temperature range of -40°C to +85°C.

Feature Summary

• Features TTL-compatible inputs for direct interfacing with standard logic families
• Provides three-state outputs controlled by a low-active enable signal
• Capable of driving loads with high current sourcing and sinking capabilities

Applications

• Bus-oriented communications systems
• Clock distribution networks
• Memory module data buffering

Procurement Notes

Verify the specific package suffix (D for SOIC-14) matches the required footprint, as the NG designation implies a tube package not listed in the primary ordering table. Confirm RoHS compliance status and ensure the datasheet revision aligns with the manufacturing date code. Cross-reference the marking diagram to validate assembly location and lot traceability before finalizing procurement orders.

Selection Notes

Select this component when TTL input compatibility is required alongside CMOS drive strength. Ensure the application voltage remains strictly within the 4.5 V to 5.5 V recommended operating conditions. Consider the thermal resistance values for the chosen package style if multiple devices operate simultaneously at maximum load currents to prevent junction temperature exceedance.

Part Context

This part belongs to the MC74AC/ACT125 family of quad buffers. While the AC variant supports a wider voltage range, the ACT variant specifically ensures compatibility with TTL logic levels. The device serves as a fundamental building block for digital signal routing, offering isolation and signal integrity maintenance in complex integrated circuit designs.

Replacement Considerations

MC74ACT125DG

FAQ

What is the function of the enable pin?

The enable pin controls the three-state output. When the enable input is low, the buffer is active and passes the input signal to the output. When high, the output enters a high-impedance state.

How does the ACT series differ from the AC series?

The ACT series features TTL-compatible input thresholds, allowing it to interface directly with TTL logic outputs, whereas the AC series uses standard CMOS thresholds.