74ACT109SC

Overview

The Fairchild Semiconductor 74ACT109SC is a dual positive-edge triggered J-K flip-flop belonging to the AC/ACT logic series. It features complementary outputs and operates within a supply voltage range of 4.5V to 5.5V. The device is housed in a 16-lead Small Outline Integrated Circuit (SOIC) package with a 0.150-inch width. It supports an operating temperature range from -40°C to 85°C, ensuring reliable performance in industrial environments.

Feature Summary

• Dual positive-edge triggered J-K flip-flop functionality
• Complementary output configuration for versatile logic interfacing
• TTL-compatible inputs for direct interface with standard logic families

Applications

• High-speed digital data storage circuits
• Shift register implementations
• Binary counter designs

Procurement Notes

Verify that the specific part number matches the required SOIC-16 surface-mount package variant. Confirm that the manufacturer designation aligns with Fairchild Semiconductor specifications. Ensure compliance with RoHS directives if environmental standards are mandatory for the target assembly process.

Selection Notes

Select this component when dual independent flip-flops are required in a compact surface-mount form factor. The ACT series provides faster switching speeds compared to standard AC devices while maintaining TTL input compatibility. Consider the 16-lead SOIC footprint constraints during PCB layout design.

Part Context

This component belongs to the widely adopted 74AC/ACT logic family, known for high-speed CMOS operation. The 74ACT109 specifically addresses applications requiring dual edge-triggered memory elements. It serves as a critical building block for sequential logic systems where precise timing control and data retention are essential requirements.

Replacement Considerations

Direct substitutes include the SN74ACT109N from Texas Instruments and the MC74ACT109AN from onsemi. These alternatives offer identical pinouts and logical functions, facilitating drop-in replacements for existing circuit designs without modification.