74HCT02D

Overview

The Toshiba Semiconductor and Storage 74HCT02D is a quad 2-input NOR gate integrated circuit belonging to the 74HCT logic series. It operates within a supply voltage range of 4.5V to 5.5V, ensuring compatibility with standard TTL-driven CMOS systems. The device features four independent NOR gates in a single package, providing high noise immunity and low power consumption typical of CMOS technology. It utilizes a 14-pin SOIC surface-mount package for efficient PCB layout. The component supports an operating temperature range from -40°C to +85°C, making it suitable for general commercial and industrial applications requiring reliable digital logic processing.

Feature Summary

• Provides four independent 2-input NOR logic functions within a single integrated circuit package
• Ensures direct interface compatibility with TTL logic families through HCT input specifications
• Delivers robust noise immunity and stable switching performance under standard 5V supply conditions

Applications

• Digital logic circuits requiring multiple NOR gate functions
• Interface modules between TTL and CMOS logic domains
• General-purpose combinatorial logic design in embedded systems

Procurement Notes

Verify the exact suffix designation against the manufacturer's current datasheet, as packaging or revision codes may vary. Confirm that the 74HCT02D variant matches the required 4.5V to 5.5V operating voltage range for your specific application. Ensure the 14-SOIC package dimensions align with your PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component when designing circuits that require multiple NOR gates with TTL-compatible input thresholds. It is appropriate for systems operating strictly at 5V where HCT speed and drive characteristics are necessary. Consider alternative HC series parts if lower voltage operation below 4.5V is required, as HCT inputs may not function correctly outside their specified voltage window.

Part Context

This part belongs to the widely adopted 74HCT family of CMOS logic devices, which bridges the gap between older TTL standards and modern CMOS efficiency. The 74HC02D is the logical equivalent in the standard HC series, offering similar functionality but with broader voltage tolerance. This specific HCT version prioritizes compatibility with existing 5V TTL infrastructure while maintaining the benefits of CMOS technology.

Replacement Considerations

Public confirmed substitute part numbers include MC74HC02ADR2G from onsemi. Verify pinout compatibility and electrical specifications before substitution.