MC74HC240ADT

Overview

The MC74HC240ADT is an octal buffer and line driver manufactured by onsemi, belonging to the HC logic series. It features eight inverting outputs with three-state capability, housed in a 20-pin SOIC package. The device operates within a supply voltage range of 2 V to 6 V. Key electrical parameters include a maximum static current of 4 uA and output drive currents of -7.8 mA for high level and 7.8 mA for low level. Propagation delays vary from 14 ns at 6 V to 80 ns at 2 V.

Feature Summary

• Provides octal buffering with three-state output control for bus-oriented architectures.
• Features inverting logic functionality with high noise immunity typical of CMOS technology.
• Supports surface-mount installation in compact SOIC-20 packages.

Applications

• Driving bus lines in digital systems
• Buffering memory address registers
• Interface circuits between different logic families

Procurement Notes

Verify the specific suffix 'ADT' against official onsemi documentation to confirm exact packaging and tape-and-reel specifications. Ensure compatibility with required operating temperature ranges and moisture sensitivity levels before procurement. Cross-reference ordering information directly with manufacturer datasheets to avoid discrepancies in package type or lead-free status.

Selection Notes

Select this component when an octal inverting buffer with three-state outputs is required for bus applications. Consider the HC series performance characteristics, including propagation delay variations across the 2 V to 6 V supply range. Evaluate package constraints for SOIC-20 suitability and verify that input/output voltage tolerances match system requirements.

Part Context

This part belongs to the MC74HC240A family of octal bus buffers. It is designed for high-speed operation while maintaining low power dissipation. The device is fabricated using silicon gate CMOS technology, offering stability and noise immunity comparable to bipolar Schottky TTL devices but with reduced power consumption.

Replacement Considerations

Direct substitutes may include other octal 3-state inverters from compatible logic families. Verify pinout compatibility and electrical specifications such as supply voltage range and output drive current. Check for equivalent package types and ensure functional parity for bus driving applications.