Analog Devices Inc. HMC553-SX

Overview

HMC553-SX from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC double-balanced passive mixer operating from 7 to 14 GHz RF/LO and DC–5 GHz IF, delivering 7 dB typical conversion loss, 50 dB LO-to-RF isolation, and +22 dBm input IP3 - ideal for microwave up/downconversion in point-to-point radios and test equipment.

For engineers reviewing the HMC553-SX datasheet, HMC553-SX pinout, HMC553-SX application, or HMC553-SX equivalent, this page provides verified package mapping, validated terminal functions, confirmed RF/IF/LO bandwidths, real-world isolation metrics, and direct alternative part comparisons for high-frequency transceiver design.

Technical Context

The HMC553-SX employs a passive double-balanced topology with integrated balun structures optimized for high LO-to-RF (50 dB typ.) and LO-to-IF (34 dB typ.) isolation across 7–14 GHz. It requires no external matching components and operates with LO drive as low as +9 dBm.

Based on GaAs MESFET process, the device supports both upconverter and downconverter configurations, maintains DC-coupled RF, LO, and IF ports, and delivers stable performance from –40°C to +85°C with robust Class 1C (1,000 V HBM) ESD protection.

Key Specifications

Pinout & Package

12-lead ceramic 3×3 mm SMT package (9 mm² footprint) with alumina body, gold-over-nickel plating, and exposed ground paddle requiring solder connection to PCB RF ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar passive double-balanced mixer applications.

Compared with HMC1048LP3E and QM11024, the HMC553-SX uniquely balances low LO drive (+9 dBm min), DC-coupled IF, and best-in-class 7 dB conversion loss in its native 7–14 GHz band - making it optimal for size-constrained, high-linearity X-band radios where IF flexibility and thermal stability are critical.

Availability

HMC553-SX is available at Aetrix Electronics and suitable for point-to-point radios, test equipment, and military communications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.

Supply support for HMC553-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 integrates its high-frequency RF portfolio into precision analog and RF solutions for communications, defense, and instrumentation markets.

The HMC553-SX belongs to Hittite's legacy GaAs MMIC mixer product line, engineered specifically for X-band wireless infrastructure and test systems demanding high isolation, wide IF bandwidth, and ruggedized SMT packaging.

FAQ

What is the minimum LO drive level required for specified performance of the HMC553-SX?

The HMC553-SX operates with a minimum LO drive of +9 dBm while maintaining specified conversion loss, isolation, and linearity. At +9 dBm, typical conversion loss is 8 dB and LO-to-RF isolation remains ≥40 dB across 7–14 GHz. Performance degrades outside datasheet limits below this level, so +9 dBm is the validated lower bound for production use of the HMC553-SX.

Can the HMC553-SX be used for zero-IF (direct-conversion) receiver applications?

Yes - the HMC553-SX supports zero-IF operation because its IF port is DC-coupled and specified from DC to 5 GHz. When used in direct-conversion receivers, the IF output can interface directly with baseband ADCs or I/Q demodulators without AC coupling. However, total DC current through the IF pin must not exceed ±2 mA to prevent non-function or damage to the HMC553-SX.

Does the HMC553-SX require external matching components or bias networks?

No - the HMC553-SX is a fully matched passive double-balanced mixer with integrated baluns. All RF, LO, and IF ports are DC-coupled and impedance-matched to 50 Ω. No external matching networks, bias tees, or DC blocking capacitors are required for basic operation, though an external series capacitor on IF may be added if DC blocking is needed for a specific application using the HMC553-SX.

What is the thermal resistance and maximum power dissipation of the HMC553-SX?

The HMC553-SX has a channel-to-ground paddle thermal resistance of 364 °C/W. Its maximum continuous power dissipation is 178 mW at 85 °C case temperature, derating linearly by 2.75 mW/°C above that. This thermal profile enables reliable operation in sealed enclosures or high-ambient environments when the exposed ground paddle is soldered to a thermally robust PCB ground plane per the HMC553-SX datasheet guidelines.

Is the HMC553-SX pin-compatible with other Hittite mixer variants like HMC554-SX or HMC1048LP3E?

No - the HMC553-SX is not pin-compatible with HMC554-SX (different pin count and function layout) or HMC1048LP3E (same 12-lead footprint but distinct pin assignments for RF/LO/IF). The HMC553-SX uses pins 2 (LO), 5 (IF), and 8 (RF); substituting alternate parts requires PCB redesign. Always verify pinout diagrams before replacement - the HMC553-SX pin mapping is unique to its functional configuration.