CD74HC240E

Overview

The CD74HC240E is an octal bus driver manufactured by Texas Instruments, belonging to the HC logic series. It features eight inverting buffers with three-state outputs housed in a 20-pin PDIP package. The device operates on a supply voltage range of 2 V to 6 V, drawing a maximum static current of 8 µA and a working power supply current of 80 µA. It supports high-level output currents of -7.8 mA and low-level output currents of 7.8 mA. The component functions reliably within an operating temperature range from -55 °C to +125 °C.

Feature Summary

• Provides eight inverting buffer channels for signal transmission
• Features three-state outputs for effective bus management
• Operates across a wide supply voltage range suitable for various digital systems

Applications

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

Procurement Notes

Verify the specific manufacturer marking and date code against official Texas Instruments documentation to ensure authenticity. Confirm that the PDIP-20 package dimensions match your PCB footprint requirements. Ensure the selected variant meets the required RoHS compliance standards for your manufacturing process. Cross-reference the datasheet electrical characteristics with your system's power supply constraints before finalizing procurement.

Selection Notes

Select this component when designing circuits requiring octal data buffering with invert functionality. The HC series offers compatibility with standard CMOS logic levels. Consider the three-state capability for multiplexed bus architectures. Verify that the 2V to 6V operating range aligns with your system's voltage rails. The wide temperature range makes it suitable for industrial applications.

Part Context

This part belongs to the Texas Instruments CD74HC family of high-speed CMOS logic devices. These components are designed to replace older TTL logic families while offering lower power consumption and higher noise immunity. The HC series is widely used in general-purpose digital electronics, providing reliable performance for data routing and signal conditioning tasks in embedded systems.

Replacement Considerations

Public confirmed substitute part numbers include CD74HC240EE4 and SN74HC240N.