QS74FCT521CTSOX

Comparators Overview

The QS74FCT521CTSOX is an 8-bit identity comparator manufactured by Quality Semiconductor, belonging to the FCT logic series. It features a CMOS construction with a ceramic metal-sealed cofired package (QCCN/LCC20). The device operates at a supply voltage of 5 V and includes inverted outputs indicating equality (A=B). It supports a maximum operating temperature of 70 °C and has a load capacitance specification of 50 pF.

Comparators Feature Summary

• Performs 8-bit magnitude comparison to determine equality between two inputs
• Provides active-low output signal when input vectors are identical
• Utilizes FCT series CMOS technology for high-speed digital logic operations

Comparators Applications

• Digital data bus monitoring systems
• Memory address verification circuits
• Parallel data integrity checking modules

Comparators Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm that the specific suffix CT-SO matches the required ceramic leadless chip carrier package variant. Ensure compliance with RoHS directives if environmental regulations apply to the target assembly, noting that some listings indicate non-compliance status for this specific part number.

Comparators Selection Notes

Select this component when an 8-bit parallel equality check is required within a 5 V logic environment. The FCT series offers compatibility with standard TTL and CMOS interfaces. Consider the ceramic package for thermal stability in industrial applications where operation up to 70 °C is necessary. Verify pinout alignment with existing PCB footprints before integration.

Comparators Part Context

This part belongs to the Quality Semiconductor FCT family, which bridges Fast CMOS and TTL performance levels. The QS74FCT521 variant specifically addresses identity comparison needs, distinguishing itself from multiplexers like the QS74FCT2158 or buffers like the CY74FCT541 found in related product lines. It serves as a dedicated logic gate for vector matching tasks.

Comparators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Cross-reference with other 8-bit identity comparators from the same FCT series or equivalent manufacturers only if electrical parameters and package dimensions are verified to be identical.