Analog Devices Inc. HMC775LC5TR

Overview

HMC775LC5TR from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC I/Q mixer with integrated LO amplifier, operating from 10–16 GHz RF/LO and delivering DC–3.5 GHz IF bandwidth. It functions as an image-reject mixer or single-sideband upconverter, achieves 25 dB image rejection, +25 dBm input IP3, and requires only 0 dBm LO drive-enabling compact point-to-point radio transceivers.

For engineers reviewing the HMC775LC5TR datasheet, HMC775LC5TR pinout, HMC775LC5TR application, or HMC775LC5TR equivalent, this device supports high-linearity SSB up/downconversion in space-constrained microwave systems where surface-mount integration, wide IF bandwidth, and thermal stability across –40°C to +85°C are critical selection criteria.

Technical Context

The HMC775LC5TR integrates two double-balanced GaAs MESFET mixer cells and an on-die 90° hybrid to enable quadrature signal processing without external hybrids. Its internal LO amplifier eliminates need for external LO buffering while maintaining 30 dB LO-to-RF isolation and 45 dB RF-to-IF1 isolation.

It supports both downconversion and upconversion modes with USB/LSB flexibility via external IF hybrid configuration. Conversion gain varies with temperature and LO drive level, exhibiting stable P1dB (13 dBm typ.) and IP3 (25 dBm typ.) across its full 10–16 GHz band at +25°C.

Key Specifications

Pinout & Package

Package: 32-lead, 5 mm × 5 mm leadless ceramic SMT package (alumina body, gold-over-nickel plating, MSL3). Exposed ground paddle must be soldered to PCB RF ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC1048LP5E and ADMV1013ACPZ, the HMC775LC5TR uniquely balances X/Ku-band coverage, integrated LO drive, and compact 5×5 mm footprint-making it optimal for space-limited 10–16 GHz transceivers where external LO buffering is undesirable and image rejection >20 dB is mandatory.

Availability

HMC775LC5TR is available at Aetrix Electronics and suitable for point-to-point radio, VSAT terminal, and military SATCOM applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for HMC775LC5TR 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 GaAs, SiGe, and RF SOI components for defense, communications, and instrumentation markets.

The HMC775LC5TR belongs to Hittite's legacy MMIC I/Q mixer product line, designed specifically for miniaturized, high-performance microwave transceivers requiring integrated LO amplification and image rejection without external hybrids.

FAQ

What is the recommended LO drive level for optimal performance of the HMC775LC5TR?

The HMC775LC5TR is specified for 0 dBm LO drive, which delivers best-in-class image rejection (25 dB typ.) and conversion gain flatness across 10–16 GHz. Driving with –2 dBm or +3 dBm degrades sideband rejection by up to 10 dB and increases LO leakage; therefore, 0 dBm is the design target for all HMC775LC5TR applications.

Does the HMC775LC5TR support both upconversion and downconversion modes?

Yes, the HMC775LC5TR supports both modes. As a downconverter, it accepts RF input and produces I/Q IF outputs. As an upconverter, it accepts I/Q IF inputs and generates RF output-requiring only external 90° hybrid configuration per application circuit. All electrical specs in the datasheet apply to both configurations unless noted otherwise.

What is the maximum allowable DC current at the IF1 and IF2 pins of the HMC775LC5TR?

The HMC775LC5TR IF1 and IF2 pins are DC-coupled but must not source or sink more than ±3 mA of current. Exceeding this limit risks non-functional behavior or permanent damage. For AC-coupled IF interfaces, external series capacitors should be used; for DC-coupled use, ensure downstream circuitry complies with the ±3 mA constraint.

Is the HMC775LC5TR still in active production or marked obsolete?

The HMC775LC5TR is marked OBSOLETE in official documentation, but Aetrix Electronics maintains legacy inventory and offers lifecycle management support-including last-time buy planning, cross-reference assistance, and technical continuity for existing designs relying on the HMC775LC5TR.

What package thermal considerations apply to the HMC775LC5TR during PCB layout?

The HMC775LC5TR features an exposed ground paddle with 80 °C/W thermal resistance (channel-to-ground). To maintain junction temperature below 125°C at max dissipation (1.1 W), the PCB must provide low-thermal-resistance grounding: solder the paddle fully, use ≥8 thermal vias (0.3 mm diameter) to inner/outer ground planes, and avoid thermal isolation under the package.