74HCT540D

Overview

The TC74HCT540D is an inverting buffer manufactured by Toshiba Semiconductor and Storage, belonging to the 74HCT logic series. It features a single element with eight bits per element and provides three-state outputs. The device operates within a supply voltage range of 4.5V to 5.5V and supports high-level output currents of -6mA and low-level output currents of 6mA. It is housed in a 20-SOIC package designed for surface mount technology. The component functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Provides inverting buffering functionality with three-state output capability
• Utilizes CMOS technology compatible with standard TTL logic levels
• Designed for surface mount installation in compact electronic assemblies

Applications

• Data bus buffering in digital systems
• Signal inversion and level shifting between logic families
• Interface circuits requiring controlled output impedance

Procurement Notes

Verify the specific suffix against manufacturer documentation to confirm package type and environmental compliance. Ensure the source document matches the exact part number to avoid confusion with through-hole variants or different manufacturers. Confirm RoHS status and moisture sensitivity levels prior to integration into production workflows.

Selection Notes

Select this component when surface mount packaging is required for inverting buffer applications. Compare propagation delay and drive current specifications against system requirements. Ensure the 20-SOIC footprint aligns with existing PCB layout constraints and thermal management strategies.

Part Context

This integrated circuit belongs to the widely adopted 74HCT family, which bridges CMOS power efficiency with TTL input compatibility. The 74HCT540 variant specifically serves as an octal buffer with inverters, commonly used in microprocessor systems and memory interfaces where signal integrity and direction control are critical.

Replacement Considerations

Direct substitutes include the MM74HCT540WMX from onsemi, though package differences exist. Verify pinout compatibility and electrical characteristics before substitution.