Analog Devices Inc. HMC523LC4TR

Overview

HMC523LC4 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC I/Q mixer in a 24-lead 4×4 mm SMT package, operating from 15–23 GHz RF/LO and DC–3.5 GHz IF. It functions as an image-reject mixer (IRM) or single-sideband upconverter with 25 dB typical image rejection, 10 dB typical conversion loss, and +25 dBm input IP3 - enabling high-linearity RF front-end designs in point-to-point radios and test equipment.

For engineers reviewing the HMC523LC4 datasheet, HMC523LC4 pinout, HMC523LC4 application, or HMC523LC4 equivalent, this page delivers verified RF performance specs, validated terminal roles, thermal and isolation characteristics, and real-world deployment context for millimeter-wave transceiver design and SSB signal generation.

Technical Context

The HMC523LC4 integrates two double-balanced GaAs MESFET mixer cells with an on-die 90° hybrid to generate quadrature IF outputs (IF1/IF2), supporting both downconversion (IRM mode) and upconversion (SSB mode). Its DC–3.5 GHz IF bandwidth accommodates baseband through low-IF architectures without external hybrids.

It achieves 47 dB LO-to-RF isolation and 22 dB LO-to-IF isolation at +17 dBm LO drive, with amplitude balance ≤0.3 dB and phase balance ≤4° across 15–23 GHz - critical for maintaining sideband suppression in wideband SSB systems.

Key Specifications

Pinout & Package

Package: 24-lead, 4×4 mm leadless RoHS-compliant SMT 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 HMC523LC4, HMC1048LP4E extends usable RF range downward but trades conversion efficiency, while QM11036 offers smaller BOM cost at reduced image rejection and IP3 - making HMC523LC4 optimal for high-performance E-band IRM/SSB systems demanding precision balance and linearity.

Availability

HMC523LC4 is available at Aetrix Electronics and suitable for point-to-point radios, VSAT terminals, and millimeter-wave test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing for defense and telecom OEMs.

Supply support for HMC523LC4 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, GaN, and SiGe MMIC solutions for defense, aerospace, and communications.

The HMC523LC4 belongs to Hittite's legacy I/Q mixer product line, designed specifically for high-performance image-reject and single-sideband signal processing in E-band wireless infrastructure and instrumentation.

FAQ

What is the recommended LO drive level for HMC523LC4 to achieve specified image rejection?

The HMC523LC4 requires +17 dBm LO drive to meet its datasheet-specified 25 dB typical image rejection. At +15 dBm LO, image rejection drops to ~19 dB; at +19 dBm, it improves marginally but risks increased distortion. Operating outside the +17 dBm ±2 dB range compromises balance and sideband suppression performance in both IRM and SSB modes. Always verify LO power at the HMC523LC4 pin using calibrated RF measurement.

Can HMC523LC4 operate with DC-coupled IF outputs, and what current limits apply?

Yes, HMC523LC4 supports DC-coupled IF outputs on pins 9 (IF1) and 11 (IF2), but each IF pin must not source or sink more than 3 mA DC current. Exceeding this limit causes non-functional behavior or permanent damage. For AC-coupled applications above ~10 MHz, external series capacitors are recommended to block DC bias while preserving IF signal integrity across the full DC–3.5 GHz bandwidth.

Is the HMC523LC4 pin-compatible with other Hittite I/Q mixers like HMC522LC4 or HMC524LC4?

No, the HMC523LC4 is not pin-compatible with HMC522LC4 or HMC524LC4. While all three use 4×4 mm packages, their pin assignments differ significantly - particularly for IF1/IF2 polarity and ground pin distribution. The HMC523LC4 has dedicated GND pins at positions 3, 5, 12, 14, and 16, whereas HMC522LC4 uses different grounding topology. PCB layout must be redesigned for each variant.

What thermal management is required for continuous operation of HMC523LC4 at maximum RF power?

HMC523LC4 has a thermal resistance of 191.5 °C/W (junction-to-package bottom) and max continuous dissipation of 340 mW at 85°C ambient. To sustain full RF power, the exposed ground paddle must be soldered to a multilayer PCB with ≥6 thermal vias (0.3 mm diameter) connecting to an internal ground plane, and the board must provide ≥2 cm² copper area beneath the package. Derating is required above 85°C ambient at 5.22 mW/°C.

Does HMC523LC4 require external matching networks on RF or LO ports?

No, the HMC523LC4 features internally matched 50 Ω RF (pin 4) and LO (pin 15) ports across 15–23 GHz, eliminating external matching components. However, proper PCB layout is essential: microstrip traces must maintain 50 Ω impedance, and ground via density around the package must match the evaluation board (e.g., Hittite's 109996) to preserve return loss and isolation specs. No baluns, transformers, or stubs are needed.