74AC02SC

Overview

The onsemi 74AC02SC is a quad 2-input NOR gate integrated circuit manufactured by Fairchild Semiconductor, now part of onsemi. It operates within a supply voltage range of 2.0V to 6.0V and supports an operating temperature from -40°C to +85°C. The device features outputs capable of sourcing and sinking 24mA. In the AC series, quiescent supply current (ICC) is reduced by 50% compared to standard AC logic. Propagation delays are typically 4.0ns at 5.0V for low-to-high transitions and 4.5ns for high-to-low transitions under 50pF load conditions.

Feature Summary

• Contains four independent 2-input NOR logic gates in a single package
• Outputs provide high drive capability with 24mA source and sink currents
• Reduced quiescent supply current for the AC variant compared to legacy AC logic
• Compatible with TTL input thresholds for the ACT variant

Applications

• General-purpose digital logic circuits requiring NOR functionality
• Memory address decoding systems
• Control logic for microprocessor interfaces
• Signal gating and masking applications

Procurement Notes

Verify the specific ordering suffix to confirm the package type, as the base number applies to multiple variants including SOP, TSSOP, and PDIP. Confirm RoHS compliance status through official manufacturer documentation, as historical production runs may vary. Check for active obsolescence notices or lifecycle changes from Fairchild/onsemi before finalizing design-in decisions.

Selection Notes

Select the 74AC02SC for designs requiring wide voltage operation between 2.0V and 6.0V. Choose the ACT variant if direct compatibility with TTL logic levels is required. Ensure the chosen package matches the PCB land pattern specifications provided in the datasheet. Verify that the 24mA output drive meets the load requirements of the connected circuitry.

Part Context

This component belongs to the 74AC/ACT family of high-speed CMOS logic devices originally developed by Fairchild Semiconductor. The 74AC02 provides quad NOR functionality, while the 74ACT02 offers similar performance with TTL-compatible inputs. These devices are designed for general-purpose digital applications requiring low power consumption and high noise immunity.

Replacement Considerations

Equivalent parts include MC74AC02DR2G and MC74AC02DG from onsemi/Fairchild. Cross-vendor replacements such as SN74AC02N from Texas Instruments offer compatible logic functions but require verification of pinout and electrical characteristics against the original datasheet.