Analog Devices Inc. HMC-C041

Overview

HMC-C041 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC passive I/Q mixer module operating from 6–10 GHz RF/LO and DC–3.5 GHz IF, delivering 35 dB image rejection, +25 dBm input IP3, and 7.5–10 dB conversion loss as an image-reject mixer or single-sideband upconverter in point-to-point radio transceivers.

For engineers reviewing the HMC-C041 datasheet, HMC-C041 pinout, HMC-C041 application, or HMC-C041 equivalent, this module supports direct microstrip/coplanar integration via removable SMA connectors, requires no external quadrature hybrid for 100 MHz USB IF output, and maintains amplitude/phase balance within 0.5 dB and 5° across temperature and LO drive.

Technical Context

The HMC-C041 integrates two double-balanced GaAs MESFET mixer cells with an on-die 90° hybrid to enable true I/Q signal processing without external phase-shifting networks. Its hermetic C-4 package houses all active and passive elements required for image-reject downconversion or SSB upconversion.

It operates with LO drive of +19 dBm (typical), achieves LO-to-RF isolation of 45 dB and LO-to-IF isolation of 25 dB, and sustains full DC–3.5 GHz IF bandwidth with DC-coupled IF1/IF2 ports - enabling baseband and low-IF architectures without external blocking capacitors when current-limited to ±3 mA.

Key Specifications

Pinout & Package

Hermetically sealed C-4 metal-ceramic module (20 g, Kovar™ body with gold-nickel plating); includes field-replaceable Tensolite 5602-5CCSF SMA connectors. Mounting spacer: nickel-plated aluminum.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC-C041, HMC1040LP4CE trades DC IF capability and lower loss for wider RF bandwidth, while QM11036 replaces hermetic reliability and passive simplicity with integrated gain and smaller footprint - making HMC-C041 optimal for mission-critical zero-IF and ruggedized deployments.

Availability

HMC-C041 is available at Aetrix Electronics and suitable for point-to-point radios, military communications systems, and satellite ground terminals requiring stable component supply, long-life obsolescence management, and traceable sourcing for Class 3 industrial and defense programs.

Supply support for HMC-C041 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 ICs, modules, and subsystems for defense, aerospace, and communications.

The HMC-C041 belongs to Hittite's legacy GaAs MMIC mixer module family, engineered specifically for high-reliability image-reject and SSB conversion in microwave infrastructure where hermetic sealing and passive stability are mandatory.

FAQ

What is the recommended LO drive level for optimal performance of the HMC-C041?

The HMC-C041 achieves best image rejection, conversion loss, and IP3 at +19 dBm LO drive. Performance degrades outside +17 to +21 dBm: below +17 dBm increases conversion loss and reduces IP3; above +21 dBm risks compression and spurious generation. All electrical specifications in the datasheet assume +19 dBm LO drive unless otherwise noted. The HMC-C041 absolute maximum LO input is +27 dBm, but sustained operation above +21 dBm is not recommended for linear applications.

Can the HMC-C041 be used for zero-IF (direct-conversion) receiver designs?

Yes, the HMC-C041 supports zero-IF operation via its DC-coupled IF1 and IF2 ports. To maintain functionality, each IF port must be limited to ±3 mA DC current; exceeding this causes non-function or permanent damage. For true DC–100 MHz operation, no external blocking capacitors are needed. The HMC-C041's 35 dB image rejection and 5° phase balance preserve I/Q orthogonality critical for QPSK and QAM demodulation in zero-IF architectures.

Does the HMC-C041 require external DC blocking on the RF or LO ports?

No - both RF and LO ports are internally AC-coupled and 50 Ω matched, so no external DC blocking is required for standard operation. The HMC-C041 datasheet explicitly states "This pin is AC coupled and matched to 50 Ohms" for pins 1 (RF) and 4 (LO). Adding external capacitors may degrade broadband return loss and is unnecessary unless interfacing with non-50 Ω sources/sinks or implementing custom bias injection schemes.

What is the thermal resistance and power dissipation limit of the HMC-C041?

The HMC-C041 has a junction-to-die-bottom thermal resistance (R_TH) of 128 °C/W. At +85°C case temperature, its continuous power dissipation is rated at 507 mW; above 85°C, it must be derated by 7.8 mW/°C. Since the HMC-C041 is a passive mixer, actual power dissipation is very low (<50 mW under typical +19 dBm LO drive); the rating primarily addresses worst-case LO overdrive or ambient heating in sealed enclosures.

How does the HMC-C041 achieve image rejection without an external quadrature hybrid?

The HMC-C041 integrates a monolithic 90° hybrid on the same GaAs die as its two double-balanced mixer cells, eliminating the need for external discrete hybrids or lumped-element phase shifters. This on-die hybrid ensures tight amplitude and phase matching (<0.5 dB / <5°) across temperature and frequency, enabling consistent 35 dB image rejection without manual tuning or calibration. The HMC-C041's internal architecture makes it a self-contained image-reject solution unlike hybrid-style assemblies requiring external alignment.