Analog Devices Inc. 115223-HMC577LC4B

Overview

HMC577LC4B from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC x2 active frequency multiplier in a 24-lead 4×4 mm QFN package, delivering +20 dBm typical output power across 27–31 GHz when driven by +5 dBm input at +5 V supply. It provides >55 dBc Fo and 3Fo isolation at 29 GHz and -128 dBc/Hz SSB phase noise at 100 kHz offset, targeting LO multiplier chains in millimeter-wave radio systems.

For engineers reviewing the HMC577LC4B datasheet, HMC577LC4B pinout, HMC577LC4B application, or HMC577LC4B equivalent, key selection criteria include its 13.5–15.5 GHz input range, single-supply operation, RoHS-compliant alumina-based SMT package, and verified performance in VSAT and test instrumentation signal paths requiring high isolation and low additive phase noise.

Technical Context

The HMC577LC4B implements a broadband GaAs PHEMT-based x2 multiplication architecture with AC-coupled 50 Ω RFIN and RFOUT ports. Its internal bias network enables stable operation from -40°C to +85°C with fixed +5 V supply and 213 mA quiescent current.

It achieves >60 dBc fundamental suppression and >55 dBc third-harmonic suppression at 29 GHz while maintaining ≥20 dB input return loss and ≥7 dB output return loss across the full 27–31 GHz output band - critical for minimizing LO leakage and spurious mixing in heterodyne receiver front-ends.

Key Specifications

Pinout & Package

24-lead 4×4 mm QFN package with exposed ground paddle; alumina body, gold-over-nickel plating; MSL3 rated; requires soldering all ground leads and paddle to PCB RF ground.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar active frequency multiplier applications.

Compared with HMC1099LP3E and QPL9057, the HMC577LC4B offers the best balance of output power (+20 dBm), harmonic suppression (>55 dBc), and defined 27–31 GHz output coverage - making it the preferred choice for E-band VSAT and military radios requiring both performance and band alignment.

Availability

HMC577LC4B is available at Aetrix Electronics and suitable for point-to-point radios, VSAT terminals, and test instrumentation requiring stable component supply, consistent RF performance, and long-term obsolescence management.

Supply support for HMC577LC4B 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/Microwave portfolio into precision analog and RF solutions for communications, defense, and instrumentation markets.

The HMC577LC4B belongs to Hittite's legacy GaAs MMIC active multiplier product line, engineered specifically for millimeter-wave LO generation in E-band wireless infrastructure and aerospace systems.

FAQ

What is the recommended input drive level for optimal performance of the HMC577LC4B?

The HMC577LC4B achieves best output power and harmonic suppression when driven with +5 dBm input signal. Its usable input range spans -2 to +6 dBm; operation outside this range risks compression or reduced isolation. The HMC577LC4B datasheet specifies +20 dBm typical output and >55 dBc 3Fo isolation at +5 dBm drive, confirming this as the design center point for most applications.

Does the HMC577LC4B require external biasing components?

No external biasing resistors or active regulation are needed - the HMC577LC4B integrates internal bias circuitry and operates from a single +5 V supply. However, three mandatory bypass capacitors (100 pF, 1,000 pF, and 2.2 µF) must be placed near pin 22 (Vdd) per the application schematic. The HMC577LC4B relies on these to stabilize supply impedance and suppress RF feedback.

Can the HMC577LC4B be used below 27 GHz or above 31 GHz?

The HMC577LC4B is characterized and guaranteed only from 27 to 31 GHz output (13.5–15.5 GHz input). Performance degrades outside this band: output power drops >3 dB at 26 GHz and 32 GHz, and Fo isolation falls below 50 dBc. For reliable operation, the HMC577LC4B must be used strictly within its specified frequency range.

What is the thermal management requirement for continuous operation of the HMC577LC4B?

The HMC577LC4B has a thermal resistance of 73°C/W (channel to ground paddle) and maximum channel temperature of 175°C. At 213 mA and +5 V, it dissipates ~1.065 W. To maintain junction temperature ≤125°C at +85°C ambient, minimum PCB copper area under the exposed paddle must provide ≤40°C/W effective thermal resistance - typically achieved with ≥4×4 mm² solid ground plane and ≥6 thermal vias.

Is the HMC577LC4B pin-compatible with other Hittite multiplier variants like HMC576LC4B?

No - the HMC577LC4B is not pin-compatible with HMC576LC4B or other members of the LC4B series. Although both use 24-lead 4×4 mm QFN packages, their pin functions differ: HMC576LC4B uses pin 22 for GND and pin 15 for Vdd, whereas the HMC577LC4B assigns pin 22 to Vdd and pin 15 to RFOUT. Interchanging them without layout revision will cause functional failure.