Analog Devices Inc. HMC526-SX

Overview

HMC526-SX from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC I/Q mixer designed for RF front-end signal translation in 6–10 GHz systems. It functions as an image-reject mixer (IRM) or single-sideband upconverter, delivering 9.5 dB typical conversion loss, 40 dB image rejection, and +28 dBm input IP3 at +19 dBm LO drive-enabling high-linearity downconversion in point-to-point radios and test equipment.

For engineers reviewing the HMC526-SX datasheet, HMC526-SX pinout, HMC526-SX application, or HMC526-SX equivalent, key selection criteria include its DC–3.5 GHz IF bandwidth, 50 dB LO-to-RF isolation, 4×4 mm SMT alumina package, and compatibility with surface-mount manufacturing without wire bonding.

Technical Context

The HMC526-SX integrates two double-balanced GaAs MESFET mixer cells with an on-die 90° hybrid to enable quadrature mixing. Its architecture supports both IRM and SSB upconversion modes without external hybrids when used with appropriate IF filtering.

It operates over –40°C to +85°C with 150°C max channel temperature, requires +19 dBm LO drive for optimal performance, and features DC-coupled IF1/IF2 ports with 3 mA absolute current limit-mandating external DC blocking for AC-coupled IF use cases.

Key Specifications

Pinout & Package

Package: 24-lead 4×4 mm leadless RoHS-compliant SMT alumina package (MSL3, 260°C peak reflow), with exposed ground paddle requiring soldering to PCB RF ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC526-SX, HMC8192LP5DE offers wider bandwidth and higher power handling but increases PCB footprint; ADL5375-05 provides integrated LO buffering and lower-frequency optimization but lacks the 6–10 GHz coverage and image rejection performance of the HMC526-SX.

Availability

HMC526-SX is available at Aetrix Electronics and suitable for point-to-point radios, VSAT terminals, and test equipment requiring stable component supply, consistent RF performance across temperature, and long-term obsolescence management.

Supply support for HMC526-SX 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 for defense, communications, and instrumentation markets.

The HMC526-SX belongs to Hittite's legacy GaAs MMIC I/Q mixer product line, engineered specifically for compact, high-isolation, wide-IF image-reject and SSB upconversion in 6–10 GHz systems.

FAQ

What is the recommended LO drive level for optimal performance of the HMC526-SX?

The HMC526-SX achieves best image rejection, conversion loss, and IP3 at +19 dBm LO drive. Performance degrades outside ±2 dB of this level: below +17 dBm, image rejection drops sharply; above +21 dBm, compression and spurious generation increase. The HMC526-SX absolute maximum LO rating is +27 dBm, but sustained operation above +21 dBm risks accelerated degradation.

Can the HMC526-SX operate with DC-coupled IF outputs in zero-IF receivers?

Yes-the HMC526-SX IF1 and IF2 ports are DC-coupled and support true zero-IF architectures. However, each port must not source or sink more than ±3 mA DC current. Exceeding this limit causes non-function or permanent damage. For AC-coupled IF use, external series capacitors must be selected to pass the target IF band without attenuating low-frequency components.

Does the HMC526-SX require external matching networks at RF or LO ports?

No-the HMC526-SX RF and LO ports are internally matched to 50 Ω across 6–10 GHz and require no external matching. The device uses on-die matching networks optimized for minimal VSWR (<1.5:1 typical). Any added external matching will degrade specified isolation, conversion loss, and amplitude/phase balance unless carefully modeled and validated.

What is the thermal management requirement for continuous operation of the HMC526-SX?

The HMC526-SX has a junction-to-case thermal resistance of 128 °C/W and dissipates up to 507 mW at 85°C ambient. To maintain <150°C channel temperature, the PCB must provide low-thermal-resistance conduction via the exposed ground paddle-minimum 6 thermal vias (0.3 mm diameter) connecting to inner/outer ground planes. Derating is 7.8 mW/°C above 85°C ambient.

Is the HMC526-SX pin-compatible with other Hittite I/Q mixers such as the HMC527LC4?

No-the HMC526-SX is not pin-compatible with HMC527LC4 or other variants in the HMC52x family. Pin assignments differ significantly: HMC526-SX uses pin 4 for RF, pin 15 for LO, and pins 9/11 for IF outputs; HMC527LC4 assigns RF to pin 15 and LO to pin 4. Substituting without layout revision will result in functional failure.