TC74HCT540AF(EL,F)

Overview

The TC74HCT540AF(EL,F) is an octal bus buffer manufactured by Toshiba Semiconductor and Storage. It features inverting logic with three-state outputs, designed for high-speed CMOS applications using silicon gate C2MOS technology. The device operates within a supply voltage range of 4.5V to 5.5V. It provides an output current capability of 6mA for both high and low states. The component is housed in a 20-SOP package and supports through-hole or surface-mount mounting types depending on the specific suffix variant.

Feature Summary

• Octal bus buffer configuration with eight independent input-output channels
• Inverting logic function providing signal phase reversal
• Three-state output capability allowing isolation when disabled
• High-speed CMOS construction utilizing silicon gate C2MOS technology

Applications

• Data bus buffering in microprocessor systems
• Signal direction control in bidirectional data transmission
• Clock distribution networks requiring inversion
• Memory interface buffering for address and data lines

Procurement Notes

Verify the exact package type and tape/reel specifications against the manufacturer's datasheet, as the EL/F suffix indicates specific packaging variations. Confirm RoHS compliance status directly with the supplier documentation. Ensure the operating temperature range meets system requirements. Cross-reference the part number with official Toshiba Semiconductor catalogs to confirm current production status and availability before finalizing procurement plans.

Selection Notes

Select this component when an octal inverting buffer with three-state control is required for 5V logic interfaces. The HCT series ensures TTL-compatible input thresholds while maintaining CMOS noise immunity. Consider the 6mA drive strength for moderate load conditions. Verify that the SOP-20 package fits the PCB layout constraints. Compare against non-inverting variants like the 541A if signal polarity preservation is needed instead of inversion.

Part Context

This part belongs to the TC74HCT540A family of octal bus buffers. It is fabricated using advanced C2MOS technology for improved speed and power efficiency compared to older standard HCT devices. The family includes complementary non-inverting versions and alternative packaging options. It serves as a key interface component in digital systems requiring robust signal buffering and direction control between different logic domains.

Replacement Considerations

Direct substitutes include the SN74HCT540N from Texas Instruments. Other compatible alternatives may exist within the same HCT logic family from different manufacturers, provided pinouts and electrical characteristics match. Verify functional equivalence regarding propagation delay and output drive strength before substitution.