CD74HCT74E

Overview

The CD74HCT74E is a dual D-type flip-flop manufactured by Texas Instruments, belonging to the HCT logic series. It features positive-edge triggering and includes dedicated Set and Reset inputs for direct control of output states. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a wide operating temperature range from -55°C to +125°C. Packaged in a standard 14-pin PDIP format, it provides two independent flip-flops with non-inverting Q outputs and complementary /Q outputs.

Feature Summary

• Dual configuration containing two independent positive-edge triggered D-type flip-flops
• Dedicated asynchronous Set and Reset inputs for immediate state control
• High-speed CMOS technology ensuring compatibility with TTL logic levels
• Wide operating temperature range suitable for industrial environments

Applications

• Data storage and register applications requiring parallel-to-serial conversion
• Shift registers for serial data transmission systems
• Timing delay circuits and pulse synchronization modules
• Frequency division and counting logic in digital controllers

Procurement Notes

Verify the package type matches the required PCB footprint, specifically the 14-pin PDIP configuration. Confirm the suffix 'E' indicates the lead-free and RoHS-compliant variant as per manufacturer specifications. Ensure the operating voltage requirements align with the 4.5 V to 5.5 V specification before integration into the design.

Selection Notes

Select this component when dual independent storage elements are required within a single package. The HCT series ensures compatibility with 5 V TTL logic families, making it suitable for mixed-voltage systems. Consider the propagation delay characteristics and power consumption relative to other logic families if speed or efficiency is critical for the specific application design.

Part Context

This part belongs to the Texas Instruments CD74HC(T) family of high-speed CMOS logic devices. The 'HCT' designation indicates High-speed CMOS with TTL-compatible input thresholds, allowing direct interfacing with 5 V TTL logic without level shifting. The '74' series typically denotes standard logic functions, while the '74' specific number identifies the dual D-flip-flop function.

Replacement Considerations

Compatible substitutes include the SN74HCT74N and SN74HCT74NSR from Texas Instruments, which share identical logical functionality and pinout configurations. Other manufacturers may offer equivalent parts such as the MC74HCT74A, provided voltage and timing parameters meet the system requirements.