Analog Devices Inc. 131216-HMC757LP4E

Overview

HMC757LP4E from Analog Devices (formerly Hittite Microwave) is a GaAs pHEMT MMIC three-stage 1 W power amplifier operating from 16 to 24 GHz, delivering 20.5 dB gain, 27.5 dBm saturated output power at 21% PAE from a +5 V supply, with DC-blocked 50 Ω matched RF I/Os - ideal for millimeter-wave point-to-point radio front-ends.

For engineers reviewing the HMC757LP4E datasheet, HMC757LP4E pinout, HMC757LP4E application, or HMC757LP4E equivalent, this device requires attention to Vgg bias tuning for 400 mA Idd, thermal management via exposed paddle soldering, and evaluation board layout adherence to 50 Ω RF routing and multi-capacitor Vdd/Vgg bypassing.

Technical Context

The HMC757LP4E integrates three cascaded GaAs pHEMT gain stages in a monolithic MMIC architecture, optimized for broadband linear amplification across K-band. Its internal matching eliminates external RF impedance networks, while DC blocking on both RFIN and RFOUT simplifies system integration.

Bias control is implemented via dedicated Vgg (pin 23) for gate voltage adjustment and Vdd (pin 21) for drain supply, each requiring triple-capacitor bypassing (100 pF / 0.1 µF / 4.7 µF). The 24-lead 4×4 mm plastic package features an exposed ground paddle thermally coupled to PCB ground for dissipation of up to 2.7 W at 85 °C ambient.

Key Specifications

Pinout & Package

Package: 24-lead, 4×4 mm surface-mount plastic package (RoHS-compliant low-stress injection molded), MSL1 rated, with exposed copper ground paddle requiring solder connection to PCB RF ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar K-band power amplifier applications.

Compared with QPA2211 and MAAP-010169, the HMC757LP4E offers optimal balance of bandwidth (16–24 GHz), matched 50 Ω I/O, and proven thermal reliability in sealed outdoor enclosures - making it preferred for cost-sensitive, high-volume K-band radios where layout simplicity and qualification maturity are critical.

Availability

HMC757LP4E is available at Aetrix Electronics and suitable for point-to-point radios, VSAT terminals, and military data links requiring stable component supply, long-term obsolescence mitigation, and traceable RoHS-compliant sourcing.

Supply support for HMC757LP4E 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 maintains its high-frequency RF portfolio, specializing in microwave/mmWave ICs for defense, communications, and instrumentation.

The HMC757LP4E belongs to Hittite's legacy GaAs pHEMT MMIC amplifier family, designed specifically for K-band infrastructure applications demanding high linearity, broadband gain, and ruggedized SMT packaging.

FAQ

What is the recommended Vgg setting to achieve nominal 400 mA Idd for HMC757LP4E?

The HMC757LP4E requires Vgg adjustment between −2 V and 0 V to set Idd = 400 mA at +5 V Vdd. Typical Vgg is −0.8 V to −1.2 V depending on unit variance and temperature. The HMC757LP4E datasheet specifies that Vgg must be tuned per unit during production calibration to meet current spec, and external 100 pF / 0.1 µF / 4.7 µF bypassing is mandatory for stability.

Does HMC757LP4E require external matching components at RF input or output?

No - the HMC757LP4E has internally matched 50 Ω RFIN and RFOUT ports with integrated DC blocking. No external matching networks, baluns, or coupling capacitors are needed. This is confirmed in the "General Description" and "Features" sections of the HMC757LP4E datasheet, and validated by the application circuit showing direct 50 Ω microstrip connections.

What thermal management is required for continuous operation of HMC757LP4E?

The HMC757LP4E requires soldering of all ground leads and the exposed bottom paddle to a multilayer PCB ground plane with ≥6 thermal vias (0.3 mm diameter) connecting to inner ground layers. At 400 mA Idd and +5 V, junction temperature must stay ≤150 °C; with 24.85 °C/W thermal resistance, a 40 °C ambient rise limits max power dissipation to ~2.2 W without heatsinking.

Is HMC757LP4E compatible with lead-free reflow processes?

Yes - the HMC757LP4E is RoHS-compliant with 100% matte tin lead finish and MSL1 rating, qualified for peak reflow temperatures up to 260 °C. The package marking "H757" and "XXXX" lot code appear on the top surface, and the low-stress plastic body withstands standard JEDEC J-STD-020D profiles without delamination or paddle lift.

Can HMC757LP4E operate outside the 16–24 GHz band?

No - the HMC757LP4E is characterized and guaranteed only from 16 to 24 GHz. Gain drops below 18 dB and return loss degrades below 11 dB outside this band, increasing risk of instability or compression. The "Electrical Specifications" table explicitly lists 16–24 GHz as the Frequency Range, and all performance plots (S-parameters, P1dB, IP3) are bounded within this window.