HMC481ST89

Overview

The HMC481ST89 is a SiGe HBT Gain Block MMIC amplifier from Analog Devices Inc., operating from DC to 5 GHz. It features a typical gain of 20 dB and a noise figure of 3.7 dB. The device requires an 8 V supply with a current draw of 79 mA. Key performance metrics include a P1dB compression point of 20 dBm and an OIP3 of 36 dBm. It is housed in a compact SOT-89-3 surface-mount package, suitable for space-constrained RF applications.

Feature Summary

• Utilizes SiGe Heterojunction Bipolar Transistor technology for high-performance amplification
• Provides broadband operation covering DC to 5 GHz frequency range
• Designed as a general-purpose gain block for various RF signal chains

Applications

• Cellular / PCS / 3G systems
• Fixed Wireless & WLAN infrastructure
• CATV, Cable Modem & DBS receivers
• Microwave Radio links
• Test and measurement equipment

Procurement Notes

Verify component status carefully as the HMC481ST89 is listed as discontinued or end-of-life by major distributors. Confirm availability through authorized channels or check for valid replacement part numbers before finalizing design specifications. Ensure that any substitute components meet the original electrical requirements for gain, noise, and power consumption.

Selection Notes

Select this component when a wideband DC-to-5 GHz amplifier is required with moderate gain and low noise. Consider the SOT-89-3 package size for PCB layout constraints. Evaluate thermal dissipation capabilities given the 8 V supply requirement. Compare against newer generations if long-term supply stability is a critical project constraint.

Part Context

This part belongs to the HMC481 series of SiGe HBT gain block MMICs. It shares architectural similarities with other Hittite/Analog Devices RF amplifiers but is distinguished by its specific DC-5 GHz bandwidth and SOT-89-3 form factor. It serves as a versatile building block for linear amplification in wireless communication systems.

Replacement Considerations

Public confirmed substitutes include the HMC481ST89E variant. Designers should verify pin compatibility and electrical parameter equivalence when transitioning between these specific variants.