Analog Devices Inc. HMC524LC3BTR

Overview

HMC524LC3BTR from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC I/Q mixer operating from 22–32 GHz RF/LO and DC–4.5 GHz IF, delivering 13 dB typical conversion loss, 20 dB image rejection, +20 dBm input IP3, and 40 dB LO-to-RF isolation - used in point-to-point radios and military radar front-ends as an image-reject mixer or single-sideband upconverter.

For engineers reviewing the HMC524LC3BTR datasheet, HMC524LC3BTR pinout, HMC524LC3BTR application, or HMC524LC3BTR equivalent, this page provides verified RF performance data, package interface details, thermal limits, absolute maximum ratings, and validated alternatives for millimeter-wave transceiver design.

Technical Context

The HMC524LC3BTR integrates standard Hittite mixer cells with an on-die 90° hybrid to enable quadrature mixing without external hybrids. It operates as either an image-reject downconverter (with external IF hybrid) or SSB upconverter, supporting USB IF output at 100 MHz.

Its GaAs MESFET process enables wide IF bandwidth (DC–4.5 GHz), high linearity (+20 dBm IP3), and stable amplitude/phase balance (±0.5 dB / ±2.5°) across temperature and frequency - critical for coherent receiver architectures requiring precise I/Q signal integrity.

Key Specifications

Pinout & Package

12-lead 3×3 mm surface-mount package with alumina body, gold-over-nickel plating, and exposed ground paddle requiring soldering to PCB RF ground per MSL3 reflow profile (peak 260°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I/Q mixer applications.

Compared with HMC524LC3BTR, HMC1048LC3BTR extends low-end RF coverage at the cost of IF bandwidth, while QM11024 trades integration for improved thermal dissipation - both require redesign of IF routing or hybrid placement, unlike the drop-in-ready HMC524LC3BTR.

Availability

HMC524LC3BTR is available at Aetrix Electronics and suitable for point-to-point radios, VSAT terminals, and military radar receivers requiring stable component supply, consistent RF performance across temperature, and long-term obsolescence mitigation.

Supply support for HMC524LC3BTR 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 GaAs and GaN MMICs for defense, aerospace, and communications infrastructure.

The HMC524LC3BTR belongs to Hittite's legacy I/Q mixer product line, designed specifically for compact, surface-mount E-band transceivers where hybrid assemblies were previously required - enabling smaller form factors and automated assembly.

FAQ

What is the maximum LO drive level for HMC524LC3BTR?

The absolute maximum LO drive level for HMC524LC3BTR is +27 dBm. Operation above this level risks permanent damage to the GaAs MESFET structure. For optimal performance and reliability, Analog Devices specifies +17 dBm as the recommended LO drive - delivering 13 dB typical conversion loss and 20 dB image rejection. Exceeding +17 dBm increases conversion gain marginally but degrades linearity and accelerates thermal stress on the HMC524LC3BTR die.

Can HMC524LC3BTR operate as both an image-reject mixer and an upconverter?

Yes, the HMC524LC3BTR can operate as either an image-reject downconverter (IRM) or a single-sideband (SSB) upconverter. As an IRM, it uses external IF hybrids to achieve 20 dB image rejection; as an upconverter, it generates clean USB output at 100 MHz IF. The HMC524LC3BTR's internal 90° hybrid and balanced topology support both modes without hardware change - only LO and IF port routing differs per application.

What is the DC current limit on the IF1 and IF2 ports of HMC524LC3BTR?

The IF1 and IF2 ports of HMC524LC3BTR are DC-coupled and must not source or sink more than ±3 mA of DC current. Exceeding this limit risks non-function or irreversible die failure due to junction overcurrent. For AC-coupled IF paths, external series capacitors should be selected to pass the required IF band (e.g., 100 MHz) while blocking DC bias - ensuring compliance with the HMC524LC3BTR's absolute maximum rating.

Does HMC524LC3BTR require external matching networks?

No, the HMC524LC3BTR features internally matched 50 Ω RF and LO inputs, and DC-coupled IF outputs - eliminating the need for external matching networks at those ports. The RF and LO pads are designed for direct connection to 50 Ω microstrip lines. However, IF output filtering or amplification may be added externally depending on system noise figure and dynamic range requirements - the HMC524LC3BTR itself requires no impedance tuning circuitry.

What is the thermal resistance and power dissipation limit of HMC524LC3BTR?

The HMC524LC3BTR has a junction-to-die-bottom thermal resistance (R_TH) of 191.5 °C/W. At 85°C ambient, its continuous power dissipation limit is 340 mW, derating by 9.8 mW/°C above that temperature. To meet this spec, the exposed ground paddle and all GND pins (1, 3, 7, 8, 10, 11, 12) must be soldered to a thermally robust PCB ground plane with multiple vias - insufficient thermal relief will cause junction temperatures to exceed 150°C, triggering permanent failure of the HMC524LC3BTR.