Analog Devices Inc. HMC558-SX

Overview

HMC558-SX from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC passive double-balanced mixer designed for RF/LO frequency translation between 5.5 GHz and 14.0 GHz, with DC–6 GHz IF bandwidth, 7 dB typical conversion loss, 45 dB LO-to-RF isolation, and operation at +15 dBm LO drive - ideal for point-to-point radio transceivers.

For engineers reviewing the HMC558-SX datasheet, HMC558-SX pinout, HMC558-SX application, or HMC558-SX equivalent, this page delivers verified RF mixer specifications, thermal and isolation performance across temperature, RoHS-compliant 3×3 mm ceramic SMT package details, and real-world up/downconverter use cases requiring high linearity and broadband IF response.

Technical Context

The HMC558-SX employs a passive double-balanced topology with integrated balun structures optimized for high LO-to-RF (45 dB typ.) and LO-to-IF (25 dB typ.) isolation. It operates without external matching components and supports both upconversion and downconversion modes.

It is fabricated in GaAs MESFET process, DC-coupled on LO, RF, and IF ports, and rated for -40°C to +85°C operation with 211 mW max dissipation at 85°C. The device achieves +24 dBm input IP3 and +54 dBm input IP2 under +15 dBm LO drive.

Key Specifications

Pinout & Package

12-lead leadless ceramic SMT package (3×3 mm, 9 mm²), alumina body, exposed ground paddle requiring solder connection to PCB RF ground plane per JEDEC MO-220 standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RF mixer applications.

Compared with HMC558-SX, HMC1048LC3B extends upper frequency coverage but sacrifices low-band performance, while QM11036 offers broader bandwidth and lower cost at the expense of higher conversion loss, reduced isolation, and non-drop-in packaging - making HMC558-SX optimal for 5.5–14 GHz fixed wireless and defense platforms demanding proven reliability and minimal external circuitry.

Availability

HMC558-SX is available at Aetrix Electronics and suitable for point-to-point radios, test equipment & sensors, and military communications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for HMC558-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 HMC558-SX belongs to Hittite's legacy GaAs MMIC mixer family, engineered specifically for microwave wireless infrastructure and electronic warfare systems requiring high linearity, broadband IF, and ruggedized SMT packaging.

FAQ

What is the recommended LO drive level for optimal performance of the HMC558-SX?

The HMC558-SX achieves best conversion loss (7 dB) and IP3 (+24 dBm) at +15 dBm LO drive. It remains functional down to +9 dBm, though conversion loss increases by ~1.5 dB and IP3 drops ~3 dB. Operation above +20 dBm is permitted within absolute maximum ratings but yields diminishing returns and increased thermal load. Always verify LO power at the HMC558-SX pin using calibrated RF measurement.

Can the HMC558-SX be used for zero-IF (direct-conversion) receiver designs?

Yes - the HMC558-SX supports DC-coupled IF operation, enabling true zero-IF architectures. However, the IF port must not source or sink more than ±2 mA DC current to avoid malfunction or damage. For DC-coupled use, ensure baseband signal paths comply with this current limit; otherwise, use an external series capacitor sized for the lowest IF frequency of interest.

Does the HMC558-SX require external matching components or bias tees?

No - the HMC558-SX is fully matched to 50 Ω on LO, RF, and IF ports and contains no active devices, so it requires no external biasing, DC blocking, or impedance-matching networks. Its passive double-balanced topology and integrated baluns eliminate the need for external transformers or lumped-element matching, simplifying PCB layout and reducing insertion loss.

What is the thermal management requirement for continuous operation of the HMC558-SX?

The HMC558-SX has a thermal resistance of 307 °C/W (channel-to-ground paddle). At 85 °C ambient and 211 mW max dissipation, junction temperature reaches ~150 °C - its absolute maximum. To maintain reliability, ensure the exposed ground paddle is fully soldered to a thermally robust PCB ground plane with ≥6 thermal vias (0.3 mm diameter) connecting to inner/outer ground layers. Derate power linearly above 85 °C ambient.

Is the HMC558-SX pin-compatible with other Hittite mixer variants like HMC558LC3B?

Yes - HMC558-SX and HMC558LC3B share identical 12-lead 3×3 mm ceramic package, pinout, and electrical specifications. The "-SX" suffix denotes the same device in tape-and-reel packaging for automated assembly, while "LC3B" indicates the original evaluation-grade marking. Both are functionally and mechanically interchangeable with no PCB or layout changes required.