HMC985A-SX

Overview

The HMC985A-SX is a GaAs MMIC voltage variable attenuator (VVA) designed for high-frequency applications. It operates within a frequency range of 20 GHz to 50 GHz, providing an attenuation value of 45 dB with a 50 Ohm impedance. The device features a die package and requires a control voltage supply ranging from -5 V to 0 V. It supports a dynamic range exceeding 37 dB and maintains an insertion loss of 2.9 dB. The component functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Absorptive design utilizing GaAs MMIC technology for stable RF signal control
• Capable of analog DC control signals to manage RF signal levels over a wide dynamic range
• Operates as a single-channel variable attenuator in a bare die format

Applications

• RF signal level control in microwave communication systems
• Test and measurement equipment requiring precise attenuation at high frequencies
• Phased array radar systems

Procurement Notes

Verify the specific suffix and package configuration when sourcing, as the HMC985A-SX denotes a die variant. Confirm compatibility with your PCB or carrier board design, as this component is not provided in a standard surface-mount package. Ensure that the control voltage requirements (-5 V to 0 V) are supported by your system's power management infrastructure before integration.

Selection Notes

Select the HMC985A-SX when operation above 20 GHz is required, specifically targeting the 20-50 GHz band. This model offers higher attenuation (45 dB) compared to some family variants. Consider the bare die form factor if space constraints preclude larger packages. Validate that the system can accommodate the necessary negative control voltage bias for proper attenuation adjustment.

Part Context

This component belongs to the HMC985 series of absorptive voltage variable attenuators manufactured by Analog Devices Inc. The series utilizes Gallium Arsenide (GaAs) Monolithic Microwave Integrated Circuit (MMIC) technology. The HMC985A-SX represents a specific frequency-optimized variant within this lineup, distinguished by its die packaging and extended upper frequency limit.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. For equivalent performance, consider other models within the HMC985 series that match the 20-50 GHz frequency range and 45 dB attenuation specifications, ensuring the package type aligns with manufacturing capabilities.