HRF-AT4520-FL-TR

Overview

The HRF-AT4520-FL-TR is a digital RF attenuator manufactured by Honeywell Aerospace, designed for precise signal control in radio frequency applications. It operates within a frequency range of 0 Hz to 2.5 GHz and provides a fixed attenuation value of 31 dB. The component features a characteristic impedance of 50 Ohms, ensuring compatibility with standard RF systems. It is housed in a compact 24-VQFN package with exposed pads, facilitating surface-mount integration. This device is currently classified as obsolete, indicating it is no longer in active production.

Feature Summary

• Provides fixed 31 dB attenuation for consistent signal level management
• Operates across a wide frequency spectrum from DC to 2.5 GHz
• Features 50 Ohm impedance matching for standard RF circuit integration
• Utilizes a compact 24-VQFN surface-mount package design

Applications

• Radio frequency signal conditioning in aerospace communication systems
• Attenuation stages in test and measurement equipment
• Signal path management in wireless infrastructure components

Procurement Notes

This component is officially listed as obsolete by the manufacturer. Procurement should focus on verifying the authenticity of remaining stock from authorized distributors or secondary market suppliers. Buyers must confirm the specific lot date code and physical condition of the units, as availability is limited to existing inventory rather than new production runs. Ensure all handling procedures comply with moisture sensitivity level requirements for QFN packages.

Selection Notes

Engineers selecting this part should note its fixed 31 dB attenuation value, which limits flexibility compared to programmable alternatives. The 2.5 GHz upper frequency limit defines its suitability for lower microwave bands. Due to its obsolete status, alternative sourcing strategies are required. Designers should verify that the 24-VQFN footprint matches their PCB layout constraints and that the thermal properties of the exposed pad meet their dissipation needs.

Part Context

The HRF-AT4520-FL-TR belongs to Honeywell Aerospace's series of RF attenuators, specifically engineered for high-reliability environments. It shares functional similarities with other models in the family but is distinguished by its specific 31 dB attenuation rating and 24-VQFN packaging. This component represents a specialized solution for fixed-loss applications where size and weight are critical factors in aerospace and defense electronics.

Replacement Considerations

As an obsolete component, direct replacements are not officially provided by Honeywell. Engineers should evaluate cross-reference parts with identical 31 dB attenuation, 50 Ohm impedance, and 2.5 GHz bandwidth. Potential substitutes must match the 24-VQFN pinout and thermal characteristics to ensure mechanical and electrical compatibility without redesigning the host circuit board.