MC74ACT540MEL

Overview

The MC74ACT540MEL is an octal buffer and line driver from the ACT series, manufactured by onsemi. It features inverting outputs with three-state capability, housed in a lead-free SOEIAJ-20 package. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports an industrial temperature range of -40°C to +85°C. Designed for memory address drivers, clock drivers, and bus transceivers, it utilizes a through-bone architecture with inputs and outputs on opposite sides of the package to facilitate microprocessor interface and PCB density optimization.

Feature Summary

• Three-state outputs allow isolation from the bus when the output enable signal is inactive.
• Through-bone pin layout places inputs and outputs on opposite sides for simplified microprocessor interfacing.
• TTL-compatible inputs ensure direct interface compatibility with TTL logic circuits.
• Lead-free construction complies with environmental standards.

Applications

• Memory and address drivers
• Clock drivers
• Bus transceivers

Procurement Notes

Verify the specific suffix 'MEL' against the official datasheet to confirm the exact tape-and-reel quantity and packaging configuration, as suffixes often dictate logistics details rather than electrical function. Ensure the component is sourced from authorized channels to guarantee authenticity and traceability for industrial applications.

Selection Notes

Select this part when an inverting octal buffer with three-state control is required for high-density PCB layouts. The ACT series offers faster switching speeds compared to standard AC variants while maintaining CMOS power efficiency. Verify that the system voltage aligns with the 4.5 V to 5.5 V operating range and that TTL input compatibility is necessary for the design.

Part Context

This component belongs to the MC74AC/ACT family of octal buffers and line drivers. It shares functional similarities with the MC74AC240 and MC74AC244 but differs in its through-bone pinout, which positions I/O pins on opposite sides of the package. This specific layout distinguishes it from standard parallel I/O devices, making it suitable for specific microprocessor port expansions.

Replacement Considerations

The MC74AC540 serves as the non-TTL compatible alternative within the same family. Cross-reference with MC74ACT540 or MC74ACT541 (non-inverting) if logical inversion requirements differ. Verify package compatibility for SOEIAJ-20 replacements.