MC74AC240NG

Overview

The MC74AC240NG is an octal buffer and line driver manufactured by onsemi, belonging to the 74AC logic series. It features eight outputs with three-state capability and inverting polarity. The device operates within a supply voltage range of 2V to 6V and supports through-hole mounting in a 20-pin DIP package. It provides symmetrical output impedance with high drive currents of 24mA for both high and low states. The component is designed for industrial temperature ranges from -40°C to +85°C.

Feature Summary

• Octal configuration providing eight independent buffered channels
• Three-state outputs allowing bus-oriented connections
• Inverting logic polarity for signal inversion applications
• High noise immunity compatible with standard CMOS levels

Applications

• Bus-oriented memory and address drivers
• Clock drivers and buffering
• Bidirectional bus transceivers
• Line driving for communication interfaces

Procurement Notes

Verify component authenticity as this part number may be obsolete or discontinued. Confirm RoHS compliance status against specific manufacturing dates. Ensure the 20-PDIP package matches design requirements. Check for available equivalents if new production units are unavailable. Validate supplier authorization before purchase.

Selection Notes

Select this component when eight inverted buffered outputs are required for bus systems. The AC series offers faster switching speeds compared to legacy LS variants. Verify that the 2V to 6V operating range suits the target system voltage. Ensure the DIP-20 package fits the PCB layout constraints. Consider current drive capabilities for load requirements.

Part Context

This device is part of the widely adopted 74AC family of high-speed CMOS logic devices. It serves as a digital buffer solution for microprocessor systems and data transmission lines. The octal structure simplifies board design by integrating multiple buffers into a single package. It maintains pin compatibility with earlier 74S240 designs while offering improved performance metrics.

Replacement Considerations

Public confirmed substitute part numbers include SN74AC240N and CD74AC240E.