M74HCT240B1R

Overview

The M74HCT240B1R is an octal bus buffer with three-state outputs manufactured by STMicroelectronics. It operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature from -55°C to +125°C. The device features a typical propagation delay of 15ns at 4.5V, symmetrical output impedance with minimum drive currents of 6mA, and balanced propagation delays. It includes protection circuits against static discharge and transient excess voltage on all inputs.

Feature Summary

• Octal bus buffer configuration with inverted three-state outputs controlled by two separate enable inputs.
• Advanced high-speed CMOS fabrication using silicon gate C2MOS technology for stable operation.
• TTL-compatible input thresholds allowing direct interfacing with standard logic families.
• Balanced propagation delays and symmetrical output impedance ensuring consistent signal timing.

Applications

• Memory address decoding
• Clock drivers
• Bus-oriented transmissions

Procurement Notes

Verify component authenticity through authorized channels as the part is marked obsolete. Confirm package integrity upon receipt, specifically checking for DIP-20 physical condition. Review datasheet specifications for absolute maximum ratings before integration to prevent damage. Ensure environmental compliance requirements match project standards.

Selection Notes

Select this component when TTL-compatible octal buffering with three-state control is required. Consider the wide operating temperature range for industrial environments. Evaluate power dissipation limits relative to thermal management capabilities. Verify pin compatibility with existing 74 series designs during circuit upgrades.

Part Context

This device belongs to the 74HCT logic family, designed for high-speed CMOS applications compatible with TTL outputs. It serves as an octal bus buffer with inverted three-state functionality. The product line utilizes advanced silicon gate technology to provide low power dissipation alongside high noise immunity.

Replacement Considerations

Direct substitutes include CD74HCT240E and SN74HCT240N. Verify pinout and electrical characteristics match before implementation.