HMC475ST89ETR

Overview

The HMC475ST89ETR is an InGaP HBT gain block MMIC amplifier from Analog Devices Inc., designed for cellular and CATV applications. It operates across a frequency range of 0 Hz to 4.5 GHz. The device provides a typical gain of 21.5 dB with a noise figure of 3.8 dB. It delivers a P1dB output power of 22 dBm and requires a supply voltage between 8 V and 12 V, drawing 110 mA of current. Packaged in a surface-mount SOT-89 (TO-243AA) case, this component is currently listed as obsolete by the manufacturer.

Feature Summary

• Utilizes InGaP Heterojunction Bipolar Transistor (HBT) technology for high-performance amplification
• Provides wideband operation covering DC to 4.5 GHz frequencies
• Designed for low-noise signal chain applications in wireless infrastructure

Applications

• Cellular base station front-end modules
• CATV distribution systems
• Wireless local loop equipment

Procurement Notes

This component is officially marked as obsolete or end-of-life by Analog Devices Inc. Procurement must rely on remaining stock from authorized distributors or secondary market suppliers. Verify the specific revision suffix and manufacturing date code upon receipt, as legacy inventory may vary. Ensure compatibility with existing board layouts due to the SOT-89 package dimensions. No new production units are available directly from the manufacturer.

Selection Notes

Select this part when a wideband DC-to-4.5 GHz gain block is required for cellular or CATV architectures. It is suitable for designs needing approximately 21.5 dB of gain with moderate linearity. Consider the single positive supply requirement and thermal management needs for the SOT-89 package. Evaluate if the obsolete status aligns with long-term product lifecycle requirements before finalizing the design.

Part Context

The HMC475 series belongs to Analog Devices' portfolio of monolithic microwave integrated circuits (MMICs). These components are engineered for robust performance in RF signal chains. The ST89 variant specifically denotes the SOT-89 surface-mount packaging configuration. This family targets applications requiring reliable amplification in compact form factors for telecommunications infrastructure.

Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. Due to the obsolete status, alternative solutions require custom impedance matching and bias network redesign. Engineers should consult Analog Devices for current recommended replacements or perform a full system-level validation if selecting a different manufacturer's gain block.