MC74LCX245DW

Overview

The MC74LCX245DW is a low-voltage CMOS octal bidirectional transceiver manufactured by onsemi. It operates within a supply voltage range of 2.0 V to 5.5 V and features five-volt tolerant inputs and outputs, enabling safe interfacing between 3.3-V systems and 5-V environments. The device provides balanced output sink and source current capabilities of 24 mA at both A and B ports. It includes an Output Enable input that places ports in a high-impedance state when active, and a Transmit/Receive input that controls data flow direction.

Feature Summary

• Five-volt tolerant I/Os allow direct interface with 5-V TTL logic while operating from lower supply voltages
• Balanced 24 mA drive capability at both ports supports memory address driving and bus-oriented applications
• IOFF specification ensures high-impedance states when power is removed, supporting live insertion and withdrawal

Applications

• Memory address driving in low-voltage systems
• TTL level bus oriented transceiver applications
• Interfacing 3.3-V components with 5-V devices

Procurement Notes

Verify the specific suffix against official datasheets to confirm package type and tape-and-reel specifications. Confirm RoHS compliance status and moisture sensitivity levels for your assembly process. Check for automotive grade variants if unique site requirements are necessary. Ensure the ordering information matches the exact functional requirements before procurement.

Selection Notes

Select this component for designs requiring bidirectional data transfer between different voltage domains. The five-volt tolerance eliminates the need for additional level shifting circuits when connecting 3.3-V logic to 5-V buses. Consider the 24 mA drive strength for driving multiple loads or longer traces without signal degradation.

Part Context

This part belongs to the LCX series of low-voltage CMOS logic devices from onsemi. The LCX family is designed for high-speed operation with low power dissipation. It serves as a bridge between older TTL-compatible systems and modern low-voltage digital electronics, offering improved switching noise performance compared to standard CMOS alternatives.

Replacement Considerations

Equivalent parts include MC74LCX245DWR2G and MC74LCX245DT. Verify pin compatibility and electrical characteristics before substitution. Ensure the replacement maintains the same five-volt tolerance and drive current specifications.