TC74VHCT540AFTEL

Overview

The TC74VHCT540AFTEL is an octal bus buffer manufactured by Toshiba Semiconductor and Storage. It belongs to the VHCT logic series, featuring CMOS technology with a non-inverting configuration. The device provides three-state outputs and operates within a supply voltage range of 4.5V to 5.5V. It is housed in a 20-TSSOP package designed for surface-mount applications. The component supports high-speed signal transmission with a propagation delay of 5.4 ns and delivers output currents of 8 mA for both high and low states.

Feature Summary

• Octal bus buffer architecture providing eight independent data paths
• Three-state output capability for effective bus line management
• CMOS construction ensuring low static power consumption
• High-speed performance suitable for demanding digital interfaces

Applications

• Data bus buffering in computer systems
• Signal isolation between different voltage domains
• Memory interface circuitry
• General-purpose digital logic buffering

Procurement Notes

Verify the specific suffix AFTEL against the official Toshiba datasheet to confirm the TSSOP-20 package and RoHS compliance status. Ensure the ordering documentation explicitly references the VHCT series specifications. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity and current production status before finalizing procurement orders.

Selection Notes

Select this component when an octal buffer with three-state outputs is required for 5V logic systems. The VHCT series offers compatibility with standard TTL inputs while maintaining CMOS noise immunity. Consider the 20-TSSOP package constraints for PCB layout. Verify that the 5.4 ns propagation delay meets the system timing requirements for the intended application frequency.

Part Context

This part is part of Toshiba's VHCT family, which combines the speed of HC logic with TTL-compatible input thresholds. The 540 designation typically indicates an octal buffer or transceiver configuration. It serves as a critical interface component in digital electronics, facilitating data transfer between microprocessors, memory devices, and peripheral circuits within embedded systems.

Replacement Considerations

Direct substitutes include the SN74HCT540N from Texas Instruments. Other compatible options may include equivalent octal buffers from manufacturers like NXP or ON Semiconductor, provided they match the VHCT electrical characteristics and TSSOP-20 package dimensions.