74AC74SJ

Overview

The Fairchild Semiconductor 74AC74SJ is a dual D-type positive edge-triggered flip-flop housed in a 14-lead Small Outline Integrated Circuit (SOIC) package. It features asynchronous Set and Clear inputs, allowing independent control of the Q and complementary outputs regardless of the clock signal. The device operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range from -40 °C to +85 °C. Outputs are capable of sourcing and sinking 24 mA, ensuring robust drive capability for bus-oriented applications.

Feature Summary

• Dual D-type flip-flops with positive edge-triggered clocking mechanism
• Asynchronous Set and Clear inputs for immediate state control
• Complementary Q and Q outputs for versatile logic interfacing
• High-drive output capability supporting 24 mA source and sink currents

Applications

• Parallel data storage registers
• Shift register configurations
• Timing and delay circuits
• Bus-oriented data latching

Procurement Notes

Verify the specific suffix 'SJ' corresponds to the SOIC-14 package variant when ordering. Confirm RoHS compliance status as historical datasheets may indicate varying environmental standards depending on production batch. Ensure the supplier provides official Fairchild or ON Semiconductor documentation to validate authenticity and traceability before finalizing procurement.

Selection Notes

Select this component when a compact dual flip-flop solution with asynchronous control is required. The AC series offers high speed and low power consumption compared to older logic families. Consider the ACT variant if TTL-compatible input thresholds are necessary for interfacing with legacy systems. Verify pinout compatibility if replacing existing designs.

Part Context

This part belongs to the 74AC logic family, known for high-speed operation and CMOS technology. It serves as a fundamental building block for sequential logic circuits. The SJ suffix typically denotes a specific surface-mount package configuration, distinguishing it from through-hole or alternative package variants within the same logical function family.

Replacement Considerations

Compatible substitutes include the 74ACT74 for TTL-compatible inputs or other manufacturers' 74AC74 equivalents such as those from STMicroelectronics or Texas Instruments. Ensure pin-to-pin compatibility and verify that electrical characteristics like propagation delay and output current meet the design requirements.