CD74FCT646ATQM

Overview

The CD74FCT646ATQM is a high-speed CMOS octal bus transceiver manufactured by Harris Corporation. It features non-inverting logic with three-state outputs, designed for 5.25V operation. The device utilizes the FCT series technology to provide fast switching speeds and low power consumption. It is housed in a 24-SSOP package with a width of 0.209 inches (5.30mm). The component supports surface-mount installation and operates within a temperature range of 0°C to 70°C.

Feature Summary

• Octal bus transceiver architecture providing eight-bit data transfer capability per element
• Non-inverting logic function ensuring signal polarity preservation during transmission
• Three-state output design enabling direct connection to system buses without additional drivers
• CMOS construction offering high noise immunity and low static power dissipation

Applications

• High-speed data bus interfaces in computing systems
• Memory module data routing and buffering
• Industrial control system signal isolation
• Telecommunications equipment data line management

Procurement Notes

Verify the specific suffix ATQM corresponds to the 24-SSOP package and 0°C to 70°C operating range. Confirm manufacturer documentation for RoHS compliance status, as legacy Harris components may not meet current environmental standards. Ensure supply chain sources provide authentic Harris Corporation or authorized distributor parts to avoid counterfeit risks associated with older logic families.

Selection Notes

Select this component when an octal, non-inverting, three-state transceiver is required for 5.25V logic systems. The FCT series offers superior speed compared to standard 74HC devices. Consider the SSOP package constraints for PCB layout. Verify thermal requirements against the specified 0°C to 70°C ambient range before integration into high-density assemblies.

Part Context

This part belongs to the Harris Corporation FCT (Fast CMOS Technology) family, known for performance comparable to Schottky TTL but with CMOS input characteristics. The 646 designation specifically indicates an octal bus transceiver. Harris Corporation was a significant semiconductor provider before its acquisition, and these parts remain relevant for maintaining legacy industrial and telecommunications hardware.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Users should consult official Harris Corporation replacement guides or equivalent FCT-series octal transceivers from other manufacturers, ensuring pin compatibility and electrical specifications match.