74ACT109SCX

Overview

The Fairchild Semiconductor 74ACT109SCX is a dual positive-edge-triggered J-K flip-flop belonging to the 74ACT 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 width of 3.90mm. It supports an operating temperature range from -40°C to 85°C and includes set and reset functions for synchronous data handling.

Feature Summary

• Dual positive-edge-triggered J-K flip-flops with complementary outputs
• TTL-compatible inputs ensuring compatibility with standard logic families
• High-speed operation suitable for bus-oriented applications
• Integrated set and reset control functions

Applications

• Synchronous digital counters
• Shift registers
• Data storage elements in microprocessor systems
• Timing circuits requiring precise edge triggering

Procurement Notes

Verify component authenticity through authorized distributors or original manufacturer channels. Confirm that the part number matches the specific SOIC-16 package configuration and ACT logic family specifications. Ensure compliance with RoHS directives if required by project standards. Validate lot codes against current production status, as availability may vary due to lifecycle changes.

Selection Notes

Select this component when dual J-K functionality with complementary outputs is required in a compact surface-mount format. The ACT series offers faster switching speeds compared to standard 74LS equivalents while maintaining TTL input compatibility. Consider the 16-pin SOIC footprint for PCB layout constraints and verify voltage levels align with the 4.5V to 5.5V operational range.

Part Context

This device is part of the widely adopted 74ACT logic family, designed to bridge performance gaps between older TTL and newer CMOS technologies. It provides high-speed switching capabilities with low power consumption relative to bipolar counterparts. The 74ACT109 specifically addresses applications needing two independent flip-flops with set/reset capabilities in a single package.

Replacement Considerations

Direct substitutes include SN74ACT109D and SN74ACT109DR from Texas Instruments. These alternatives offer identical pinouts and logical functionality, facilitating drop-in replacements for design upgrades or supply chain adjustments without circuit modification.