Analog Devices Inc. 108190-HMC591LP5

Overview

HMC591LP5 from Analog Devices (formerly Hittite Microwave) is a GaAs PHEMT MMIC 2 W power amplifier operating from 6 to 9.5 GHz, delivering 18 dB gain, +33 dBm saturated output power at 20% PAE, and +41 dBm OIP3 when biased at 940 mA - used as a final-stage RF power amplifier in point-to-point radio transmitters.

For engineers reviewing the HMC591LP5 datasheet, HMC591LP5 pinout, HMC591LP5 application, or HMC591LP5 equivalent, this page provides verified specifications, thermal and biasing context, QFN package layout, real-world use cases in military and space-grade radios, and two validated alternative amplifiers with documented performance trade-offs.

Technical Context

The HMC591LP5 is a fully matched, DC-blocked 50 Ω GaAs PHEMT MMIC amplifier requiring no external matching components. Its gate bias (Vgg) is adjustable between –2 V and 0 V to set supply current (Idd), enabling optimization for either OIP3 (+41 dBm at 940 mA) or P1dB (+33 dBm at 1340 mA).

It operates over –40 °C to +85 °C with thermal resistance of 9.59 °C/W (channel-to-package bottom), and features integrated ground paddle and 32-pin QFN package optimized for RF grounding and heat dissipation in compact microwave PCB layouts.

Key Specifications

Pinout & Package

32-pin 5 mm × 5 mm QFN package with exposed metal thermal paddle (leadless SMT, MSL1, Sn/Pb finish). Requires soldering all ground pads and thermal paddle directly to PCB RF ground plane per Hittite land pattern guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RF power amplifier applications.

Compared with QPA2211 and HMC998A, the HMC591LP5 offers the most balanced combination of bandwidth (6–9.5 GHz), ease of integration (no external matching), and proven reliability in space/military deployments - making it optimal for rapid prototyping and production of C/X-band radios without redesign overhead.

Availability

HMC591LP5 is available at Aetrix Electronics and suitable for point-to-point radios, military communications systems, and space-qualified telemetry transmitters requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for HMC591LP5 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 integrates its high-frequency RF portfolio into mission-critical signal chain solutions for defense, aerospace, and instrumentation markets.

The HMC591LP5 belongs to Hittite's legacy GaAs PHEMT MMIC power amplifier product line, designed specifically for high-linearity, high-efficiency C- and X-band transmitter applications in size- and power-constrained environments.

FAQ

What is the recommended biasing procedure for the HMC591LP5?

The HMC591LP5 requires gate bias (Vgg) adjustment between –2 V and 0 V to achieve target Idd. For +33 dBm P1dB, set Idd = 1340 mA at +7 V using a precision Vgg source; for +41 dBm OIP3, reduce Idd to 940 mA. External bypassing with 100 pF and 2.2 μF capacitors on Vgg and each Vdd pin is mandatory per Hittite Application Note. The HMC591LP5 must not be operated outside absolute max ratings: Vdd ≤ +8 V, Vgg ≥ –2 V, RFIN ≤ +15 dBm.

Does the HMC591LP5 require external matching components?

No - the HMC591LP5 is internally 50 Ω matched at both input and output across 6–9.5 GHz. Its RFIN and RFOUT pads are AC-coupled and impedance-controlled, eliminating need for external baluns, stubs, or LC networks. This simplifies layout and improves repeatability in high-volume RF module assembly. The HMC591LP5 achieves ≥12 dB input return loss and ≥10 dB output return loss without any external components.

What thermal management is required for continuous operation of the HMC591LP5?

The HMC591LP5 has a thermal resistance of 9.59 °C/W (channel-to-package bottom). To maintain channel temperature ≤175 °C at full +33 dBm output, the PCB must provide low-thermal-resistance path: exposed paddle soldered to ≥4-layer board with ≥8 thermal vias (0.3 mm diameter) connecting to inner ground planes, plus optional aluminum heatsink. At ambient +75 °C, derating begins at 104.3 mW/°C above that point - the HMC591LP5 must not exceed 10.43 W continuous dissipation.

Can the HMC591LP5 be used in space applications?

Yes - the HMC591LP5 is widely deployed in LEO satellite telemetry transmitters due to its GaAs PHEMT process radiation tolerance, –40 °C to +85 °C operating range, and proven reliability under thermal cycling and vacuum conditions. Its 0.05 dB/°C gain variation ensures stable link budgets across orbital temperature swings. While not formally QML-V qualified, the HMC591LP5 has flight heritage in multiple commercial space programs and meets MIL-PRF-19500 screening requirements when procured to appropriate lot traceability standards.

What is the difference between HMC591LP5 and HMC591LP5E?

The HMC591LP5 uses Sn/Pb lead finish and has MSL1 rating with 235 °C peak reflow; the HMC591LP5E is RoHS-compliant with 100% matte tin finish and MSL1 rating at 260 °C peak reflow. Both share identical electrical specs, pinout, and thermal performance. The HMC591LP5E replaces the HMC591LP5 in new designs requiring lead-free compliance, while the HMC591LP5 remains available for legacy Sn/Pb assembly lines. Neither variant affects HMC591LP5 functionality or system-level integration.