Analog Devices Inc. 117510-HMC609LC4

Overview

HMC609LC4 from Analog Devices (formerly Hittite Microwave) is a GaAs PHEMT MMIC low-noise amplifier optimized for 2–4 GHz RF front-ends in radar, test equipment, and microwave communications. It delivers 20 dB small-signal gain, 3.5 dB noise figure, +36.5 dBm output IP3, and operates at +6 V with 170 mA total supply current. Its 50 Ω matched, DC-blocked RF I/Os enable drop-in integration without external matching.

For engineers reviewing the HMC609LC4 datasheet, HMC609LC4 pinout, HMC609LC4 application, or HMC609LC4 equivalent, this page provides verified performance data, thermal stability metrics, package layout guidance, and real-world integration considerations for high-reliability RF systems requiring flat gain and low noise across S- to C-band.

Technical Context

The HMC609LC4 employs a monolithic GaAs PHEMT process to achieve broadband low-noise amplification with minimal gain variation (±0.4 dB) over 2–4 GHz. Its internal bias network supports fixed-gate-voltage operation (Vgg ≈ −0.9 V) and dual drain supplies (Vdd1/Vdd2), enabling stable 170 mA total current draw at +6 V.

Thermal design is critical: channel-to-ground paddle thermal resistance is 60 °C/W, and operating temperature range is −40 °C to +85 °C. The device exhibits predictable gain drift (0.015–0.02 dB/°C) and maintains >15 dB output return loss across temperature, supporting robust system-level impedance stability.

Key Specifications

Pinout & Package

Package: 4 mm × 4 mm ceramic QFN (alumina body, gold-over-nickel lead finish), MSL3 rated, with exposed ground paddle requiring soldering to PCB RF ground per Hittite land pattern guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise amplifier applications.

Compared with HMC608LC4 and QPL9057, the HMC609LC4 delivers the lowest noise figure and tightest gain flatness specifically within 2–4 GHz, making it the optimal choice for radar, test equipment, and secure comms where signal fidelity and thermal stability are non-negotiable.

Availability

HMC609LC4 is available at Aetrix Electronics and suitable for fixed microwave radio, radar receiver front-ends, and test & measurement equipment requiring stable component supply, full RoHS compliance, and guaranteed traceable sourcing.

Supply support for HMC609LC4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices acquired Hittite Microwave in 2014 and continues its legacy of high-performance RF ICs for defense, aerospace, and instrumentation markets.

The HMC609LC4 belongs to Hittite's GaAs PHEMT MMIC amplifier product line, engineered for broadband low-noise amplification in demanding RF systems where gain flatness, thermal stability, and rugged packaging are essential.

FAQ

What is the recommended gate bias voltage for the HMC609LC4?

The HMC609LC4 requires an external gate supply voltage (Vgg) adjusted between −1.5 V and −0.5 V, with −0.9 V being the typical setting to achieve the specified 170 mA total drain current at +6 V supply. This bias point ensures optimal noise figure and gain flatness across temperature and frequency; deviation beyond the range risks degraded linearity or instability.

Does the HMC609LC4 require external matching components?

No, the HMC609LC4 features fully 50 Ω matched RF input (pin 3) and output (pin 16), both AC-coupled and internally matched across 2–4 GHz. This eliminates the need for external matching networks, simplifying PCB layout and improving manufacturing yield-confirmed by measured S11 and S22 ≥15 dB across the band.

What is the thermal resistance and maximum junction temperature of the HMC609LC4?

The HMC609LC4 has a channel-to-ground paddle thermal resistance of 60 °C/W. Its absolute maximum channel temperature is 175 °C, with continuous power dissipation limited to 1.1 W at 85 °C ambient (derated by 16.7 mW/°C above that). Proper thermal design-including soldering the exposed paddle to a multilayer ground plane-is mandatory to sustain HMC609LC4 reliability.

Can the HMC609LC4 operate at supply voltages other than +6 V?

Yes, the HMC609LC4 operates over a Vdd range of +5.5 V to +6.5 V, with supply current scaling from 160 mA to 180 mA respectively. Gain and noise figure remain stable across this range, though OIP3 and P1dB decrease slightly at lower voltages. Operation outside this range violates Absolute Maximum Ratings and may cause permanent damage to the HMC609LC4.

Is the HMC609LC4 pin-compatible with other Hittite 4 mm QFN LNAs like the HMC608LC4?

Yes, the HMC609LC4 shares identical 24-pin 4 mm × 4 mm QFN package dimensions, pinout, and land pattern with the HMC608LC4 and HMC610LC4. This allows direct PCB-level substitution in existing layouts when upgrading for improved 2–4 GHz noise figure and gain flatness-no redesign or footprint change is required for the HMC609LC4.