MC74HCT74AD

Flip Flops Overview

The MC74HCT74AD is a dual D-type flip-flop manufactured by Motorola, belonging to the HCT logic series. It features two independent positive-edge-triggered circuits with complementary outputs and asynchronous Set and Reset inputs. The device operates within a supply voltage range of 4.5 V to 5.5 V and utilizes a 14-pin SOIC package. Key electrical parameters include a propagation delay of 24 ns, high-level output current of -4 mA, and low-level output current of 4 mA. It supports an operating temperature range from -55°C to +125°C.

Flip Flops Feature Summary

• Dual D-type flip-flops with positive-edge triggering
• Asynchronous Set and Reset inputs for direct control
• Complementary Q and Qbar outputs available per circuit
• LSTTL-compatible input levels for CMOS integration

Flip Flops Applications

• Data storage and register applications
• Shift registers in digital systems
• Frequency division circuits
• Timing and synchronization logic

Flip Flops Procurement Notes

Verify the manufacturer origin carefully, as the MC74HCT74AD designation was originally associated with Motorola but is now commonly produced by onsemi under similar part numbers. Confirm the specific datasheet version and pinout compatibility before integration. Ensure the package type matches the required PCB footprint and that the operating temperature range meets the environmental specifications of the target application.

Flip Flops Selection Notes

Select this component when dual independent D-type storage with set/reset functionality is required in a 5V CMOS environment. The HCT series ensures compatibility with LSTTL logic levels, simplifying interface design with legacy or mixed-logic systems. Consider the 24 ns propagation delay and 125°C max operating temperature for timing and thermal constraints. Verify availability of the specific Motorola or compatible onsemi variant for the required package style.

Flip Flops Part Context

The MC74HCT74AD is part of the widely used 74HCT logic family, designed for high-speed CMOS operation with TTL compatibility. Originally developed by Motorola, this line has been continued by onsemi following their acquisition of Motorola's semiconductor business. The 'A' suffix typically denotes improved speed characteristics compared to standard variants. This component serves as a fundamental building block for sequential logic circuits in industrial and consumer electronics.

Flip Flops Replacement Considerations

The MC74HCT74ADG is a direct equivalent manufactured by onsemi, offering identical functionality and pinout. Other compatible alternatives include the SN74HCT74 from Texas Instruments and the HC74 series from NXP, provided voltage and speed requirements are met. Always verify datasheet specifications for exact parameter matching before substitution.