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The HFA3661IA is a monolithic bipolar downconverter designed for RF applications operating within the 2.0GHz to 2.7GHz frequency range. Manufactured by Harris Corporation, this integrated circuit serves as a secondary converter suitable for CDMA, TDMA, and WLAN systems. The device is housed in a surface-mount 20-SSOP package with a width of 3.90mm (0.154 inches). It functions as part of a radio chip set architecture, providing essential signal conversion capabilities for wireless communication subsystems.
Verify the manufacturer origin carefully, as Harris Corporation's semiconductor assets have undergone multiple acquisitions and rebranding events over time. Ensure the specific suffix 'IA' matches the required temperature grade and package variant. Cross-reference the datasheet revision history to confirm pinout compatibility and electrical specifications against current supply sources.
Select this component when a dedicated secondary downconverter is required for frequencies between 2.0GHz and 2.7GHz. Consider the 20-SSOP footprint constraints during PCB layout. Evaluate system noise figure requirements against the IC's internal gain characteristics. Confirm that the bipolar technology aligns with the overall power budget and linearity needs of the target RF application.
The HFA3661 belongs to the PRISM Radio Chip Set family developed by Harris Corporation. This series was engineered to provide complete RF solution blocks for mobile communications. The HFA3661 specifically addresses the downconversion stage, complementing other chips in the set to form a functional transceiver module for early generation digital cellular standards.
Public confirmed substitute part numbers are not available in the provided documentation. Due to the age of the component and corporate restructuring, direct equivalents may require architectural adaptation or redesign of the surrounding RF circuitry.