HMC479ST89

Overview

The HMC479ST89 is a SiGe HBT gain block MMIC amplifier from Analog Devices Inc. It operates from DC to 5 GHz in an SOT-89 surface-mount package. Key electrical parameters include a typical gain of 19 dB, a noise figure of 3.8 dB, and a P1dB compression point of 22.5 dBm. The device requires an 8 V supply voltage and draws 110 mA of current. It supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Utilizes Silicon Germanium (SiGe) Heterojunction Bipolar Transistor technology for high-performance amplification
• Provides broadband coverage from direct current up to 5 GHz
• Designed as a compact surface-mount integrated circuit for space-constrained applications

Applications

• Wireless communication systems requiring broadband RF amplification
• Test and measurement equipment utilizing wideband signal processing
• General-purpose RF gain stages in mobile infrastructure

Procurement Notes

Verify component authenticity through authorized distributors or the manufacturer directly. Confirm the specific suffix indicates RoHS compliance if required by your assembly process. Check for End-of-Life status or discontinuance notices from Analog Devices prior to finalizing design-in decisions. Ensure supply chain stability given potential obsolescence risks associated with older SiGe platforms.

Selection Notes

Select this component when a broadband SiGe solution is preferred over GaAs alternatives for cost or availability reasons. Consider the 8V supply requirement against system power constraints. Evaluate the SOT-89 thermal performance against expected power dissipation levels. Compare gain and noise specifications against alternative models like the HMC482 if higher linearity is needed.

Part Context

This part belongs to the Hittite Microwave Corporation product line acquired by Analog Devices Inc. The HMC479 series represents a family of SiGe HBT gain blocks designed for versatile RF applications. These devices were widely used before being succeeded by newer generations of MMICs offering improved integration or lower power consumption.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Analog Devices technical support for current recommended replacements due to potential discontinuation status.