MC74AC240DT

Overview

The MC74AC240DT is an octal bus buffer manufactured by onsemi, belonging to the AC logic series. It features eight inverting inputs and three-state outputs housed in a TSSOP-20 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 -24 mA and a low-level output current of 24 mA. Propagation delay is specified at 8 ns at 3.3 V and 6.5 ns at 5 V. Quiescent current is typically 8 µA, with a maximum power dissipation of 200 mW.

Feature Summary

• Provides octal buffering capability with inverted signal polarity for data line management.
• Features three-state outputs to facilitate bus-oriented applications and system isolation.
• Supports symmetrical output impedance with balanced drive capabilities for both sourcing and sinking currents.

Applications

• Bus-oriented systems requiring isolated data transmission paths
• Clock drivers and buffered clock distribution networks
• Memory address and data register driving

Procurement Notes

Verify the specific suffix against official datasheets to confirm package type and tape/reel specifications. Ensure the component meets required RoHS compliance standards for the target application. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm availability and authenticity before procurement.

Selection Notes

Select this component when an octal inverting buffer with three-state control is required for CMOS logic interfaces. Consider the 2 V to 6 V operating range and 24 mA drive strength for compatibility with downstream loads. Evaluate the TSSOP-20 package constraints against PCB layout requirements and thermal dissipation needs.

Part Context

This component is part of the MC74AC240 family, which includes variants such as MC74AC240DTR2G and MC74AC240DWG. These parts share identical logical functionality but differ in packaging formats like TSSOP or SOIC. The family is designed for high-speed digital applications requiring reliable signal buffering within standard CMOS voltage domains.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pinout and electrical specifications with alternative manufacturers if direct substitution is necessary.