TC74VHCT240AFTEL

Overview

The TC74VHCT240AFTEL is an octal bus buffer featuring inverted, 3-state outputs. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature from -40 °C to +85 °C. The device provides balanced propagation delays with a typical value of 6.1 ns at 5 V. Quiescent current is limited to a maximum of 4 μA at 25 °C. Input levels are compatible with TTL standards, allowing for interfacing between 3.3 V and 5 V systems.

Feature Summary

• Inverted octal bus buffer with two active-low output enables
• Power down protection on all inputs and outputs
• Compatible with TTL input voltage levels
• Balanced propagation delays

Applications

• 3-state memory address drivers
• Level conversion for interfacing 3.3 V to 5 V systems
• Bus-oriented transmissions

Procurement Notes

Verify the specific package suffix (TEL) against the manufacturer's official documentation to confirm the tape and reel configuration. Ensure the ordering part number matches the exact logic function required, as the TC74VHCT240 series includes non-inverting variants like the TC74VHCT244 which share similar electrical characteristics but differ in logical operation.

Selection Notes

Select this component when an inverted octal buffer with 3-state control is required for high-speed CMOS applications. It serves as a pin-compatible alternative to standard 74AC/HC/F/ALS/LS series devices. Consider the VHCT logic family for its ability to accept TTL-level inputs while maintaining low power dissipation and high noise immunity suitable for mixed-voltage system designs.

Part Context

This component belongs to Toshiba's advanced high-speed CMOS OCTAL BUS BUFFER family. It utilizes silicon gate C2MOS technology to achieve performance comparable to Bipolar Schottky TTL while preserving CMOS low power advantages. The device is designed for robust operation in environments requiring hot board insertion or battery backup scenarios due to its wide input/output voltage tolerance.

Replacement Considerations

Pin and function compatible with 74 series 240/244 types such as 74AC, 74HC, 74F, 74ALS, and 74LS.