Analog Devices Inc. HMC524LC3B

Overview

HMC524LC3B 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 in a 3×3 mm SMT package - used as an image-reject mixer or single-sideband upconverter in millimeter-wave radios.

For engineers reviewing the HMC524LC3B datasheet, HMC524LC3B pinout, HMC524LC3B application, or HMC524LC3B equivalent, this page provides verified RF performance data, thermal limits, ground-critical pin assignments, and real-world deployment context for point-to-point, VSAT, and military microwave systems.

Technical Context

The HMC524LC3B integrates standard Hittite GaAs MESFET mixer cells with an on-chip 90° hybrid to enable I/Q downconversion or upconversion without external hybrids. It operates with a fixed 100 MHz USB IF output when configured as an IRM and supports DC-coupled IF1/IF2 ports with ±0.5 dB amplitude and ±2.5° phase balance across band.

Its architecture eliminates wirebonding, relying on surface-mount-compatible alumina packaging with backside die grounding. The device requires +17 dBm LO drive for optimal performance and maintains stable conversion gain and image rejection over –40°C to +85°C ambient temperature.

Key Specifications

Pinout & Package

Package: 12-lead 3×3 mm ceramic SMT (alumina body, gold-over-nickel plating, MSL3), with exposed ground paddle requiring solder connection to PCB RF ground per Note 6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC524LC3B, HMC1048LP4E offers extended low-frequency RF coverage and lower conversion loss but sacrifices DC-coupled IF and compact size; QM11024 improves IP3 by 2 dB but trades off image rejection and IF coupling flexibility - making HMC524LC3B optimal for space-constrained, zero-IF, high-rejection designs.

Availability

HMC524LC3B is available at Aetrix Electronics and suitable for point-to-point radios, VSAT terminals, and military radar sensors requiring stable component supply, consistent RF performance, and long-term obsolescence management.

Supply support for HMC524LC3B 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 high-frequency RF IC portfolio, specializing in GaAs and SiGe solutions for defense, aerospace, and communications infrastructure.

The HMC524LC3B belongs to Hittite's legacy MMIC mixer family designed specifically for millimeter-wave image-reject and SSB upconversion applications where miniaturization, repeatability, and hybrid-free integration are critical.

FAQ

What is the recommended LO drive level for optimal performance of the HMC524LC3B?

The HMC524LC3B achieves best-in-class image rejection, conversion loss, and IP3 at +17 dBm LO drive. Operating below +15 dBm degrades image rejection and increases conversion loss; exceeding +19 dBm risks compression and reduced linearity. All published specs assume +17 dBm LO unless otherwise noted, and the device supports up to +27 dBm absolute maximum LO input.

Can the HMC524LC3B be used for zero-IF (direct-conversion) receiver applications?

Yes - the HMC524LC3B supports zero-IF operation via its DC-coupled IF1 and IF2 ports, enabling true complex baseband output from 22–32 GHz RF. However, the IF ports must not source or sink more than ±3 mA DC current to avoid die malfunction or failure, and external DC blocking is required only if DC operation is not needed.

What thermal considerations apply to the HMC524LC3B during PCB layout?

The HMC524LC3B has a thermal resistance of 191.5 °C/W (junction-to-die-bottom) and requires full-solder connection of its exposed ground paddle and all ground pins (1, 3, 7, 8, 10, 11, 12) to a low-impedance RF ground plane. Insufficient grounding causes thermal runaway above 85°C ambient, especially under continuous +17 dBm LO drive and high RF input power.

Does the HMC524LC3B require external matching components for 50 Ω operation?

No - the RF, LO, and IF ports are internally matched to 50 Ω. The RF and LO pads are AC- and DC-coupled respectively with integrated matching; IF1/IF2 are DC-coupled with on-die termination. External matching is unnecessary, though proper microstrip transitions and ground via density remain critical for maintaining broadband 50 Ω integrity up to 32 GHz.

How does the HMC524LC3B handle spurious responses in upconverter mode?

In upconverter mode, the HMC524LC3B exhibits mRF ± nLO spurs - e.g., at 24.5 GHz RF and 24.4 GHz LO, the dominant spur is at 24.3 GHz (m=0,n=1) at –13 dBc. Spur levels vary with frequency and LO power; worst-case spurs exceed –10 dBc only near band edges. System-level filtering is recommended for demanding spectral purity applications.