Analog Devices Inc. HMC774-SX

Overview

HMC774-SX from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC double-balanced mixer operating from 7 to 34 GHz RF/LO and DC–8 GHz IF, delivering 10–14 dB conversion loss, +22 dBm input IP3, and 35 dB LO/RF isolation in a 12-lead 3×3 mm ceramic SMT package. It functions as an upconverter or downconverter with no DC bias required and is used in millimeter-wave point-to-point radios and test equipment.

For engineers reviewing the HMC774-SX datasheet, HMC774-SX pinout, HMC774-SX application, or HMC774-SX equivalent, key selection criteria include RF/LO frequency coverage (7–34 GHz), IF bandwidth (DC–8 GHz), LO drive sensitivity (+15 dBm typical), passive operation, and 3×3 mm RoHS-compliant ceramic package compatibility with surface-mount assembly.

Technical Context

The HMC774-SX employs optimized on-chip balun structures to achieve high LO-to-RF (35 dB) and LO-to-IF (20–40 dB) isolation, enabling clean signal translation without external matching networks. Its passive architecture eliminates DC bias requirements and supports both upconversion and downconversion modes.

It operates across two RF/LO bands: 7–20 GHz and 20–34 GHz, with IF performance validated at 0.5 GHz. Conversion gain varies with temperature and LO drive level, and spurious output suppression (e.g., mRF ± nLO) is characterized across the full band.

Key Specifications

Pinout & Package

12-lead leadless ceramic package (3×3 mm, 9 mm²) with exposed ground paddle; alumina body, gold-over-nickel plating, MSL3 rating, and RoHS compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC774-SX, HMC1048LP3E extends usable frequency but trades conversion loss, while QPC1006 adds LO amplification at the cost of frequency range and IF bandwidth-neither is pin-compatible, and each serves distinct system-level trade-offs in bias architecture, size, and band coverage.

Availability

HMC774-SX is available at Aetrix Electronics and suitable for point-to-point radios, test equipment, and military communications requiring stable component supply, long-term obsolescence management, and traceable sourcing for RF front-end production.

Supply support for HMC774-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.

The HMC774-SX belongs to Hittite's GaAs MMIC mixer product line, designed specifically for millimeter-wave wireless infrastructure and test equipment where passive, broadband, and surface-mount performance are critical.

FAQ

What is the recommended LO drive level for optimal performance of the HMC774-SX?

The HMC774-SX achieves best conversion loss and isolation with LO drive levels of +15 dBm or higher. At +15 dBm, typical conversion loss is 10–11 dB and LO/RF isolation reaches 35 dB. Lower drive (e.g., +13 dBm) increases conversion loss by ~1 dB and reduces IP3 by ~2 dBm. The HMC774-SX does not require DC bias, so LO drive is the primary performance control parameter.

Does the HMC774-SX support DC-coupled IF operation, and what are the current limits?

Yes, the HMC774-SX IF port (Pin 5) is DC-coupled and supports operation from DC to 8 GHz. However, it must not source or sink more than ±2 mA of current; exceeding this limit risks non-function or permanent damage. For AC-coupled applications, a series capacitor sized for the lowest IF frequency should be used externally.

What thermal management is required for continuous operation of the HMC774-SX?

The HMC774-SX has a channel-to-ground thermal resistance of 343 °C/W and a max continuous dissipation of 189 mW at 85 °C ambient. To maintain reliability, the exposed ground paddle must be soldered to a thermally robust PCB ground plane with ≥6 vias (0.3 mm diameter) connecting to inner/outer ground layers. Use of an external heatsink is recommended for >150 mW average power.

Can the HMC774-SX be used as both an upconverter and downconverter, and are there performance differences?

Yes, the HMC774-SX is bidirectional and functions as both upconverter and downconverter. All published specifications-including conversion loss, IP3, and isolation-are measured in downconverter mode (RF→IF) unless otherwise noted. Upconverter performance is verified per application note AN-1181 and shows comparable loss and linearity, though LO-to-RF isolation remains identical while RF-to-IF isolation differs due to port asymmetry.

What is the absolute maximum RF/IF input power rating for the HMC774-SX?

The absolute maximum RF/IF input power for the HMC774-SX is +21 dBm. Exceeding this level risks permanent damage to the internal diode quad. This rating applies regardless of whether the device is used as an upconverter or downconverter. Operation near this limit should include thermal derating and verification of peak envelope power in modulated signals.