HMC475ST89E

Overview

The HMC475ST89E is an InGaP HBT gain block MMIC amplifier covering DC to 4.5 GHz. It provides 21.5 dB of gain and +35 dBm output IP3 at 850 MHz. The device requires 110 mA from a single positive supply voltage ranging from 8 V to 12 V. Key electrical specifications include a noise figure of 3.8 dB, a P1dB compression point of 22 dBm, and operation in a SOT-89 package.

Feature Summary

• Utilizes InGaP Heterojunction Bipolar Transistor (HBT) technology for high performance
• Features Darlington topology to achieve high gain and linearity
• Operates with a single positive power supply for simplified circuit design

Applications

• Cellular infrastructure systems
• CATV distribution networks
• Broadband wireless communication links

Procurement Notes

This component is officially marked as obsolete and no longer manufactured by Analog Devices Inc. Verification of current availability through authorized distributors is required, though stock may be limited or exhausted. Procurement should focus on verifying the authenticity of remaining inventory and confirming end-of-life status before integration into new designs.

Selection Notes

Engineers selecting this part must account for its discontinued status when planning long-term production runs. The device offers wideband coverage from DC to 4.5 GHz with moderate noise characteristics suitable for general-purpose RF amplification. Designers should evaluate alternative components within the Analog Devices portfolio that provide similar gain and frequency ranges but are currently in active production.

Part Context

The HMC475 belongs to the Hittite Microwave Corporation product line, which was acquired by Analog Devices Inc. This specific model represents a surface-mount monolithic microwave integrated circuit designed for robust RF signal amplification. It is housed in a compact SOT-89 package, facilitating placement in space-constrained electronic assemblies requiring reliable mid-band amplification.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation due to the component's obsolete status. Designers are advised to consult Analog Devices technical support for recommended alternatives that match the DC-4.5 GHz frequency range and SOT-89 footprint requirements.