Analog Devices Inc. HMC144LC4TR

Overview

HMC144LC4TR from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC double-balanced mixer operating from 6 to 20 GHz, used as an upconverter or downconverter in RF front-ends. It delivers 11.5 dB typical conversion loss, +23 dBm input IP3, and 35 dB LO/RF isolation with DC–3 GHz IF bandwidth, enabling high-linearity signal translation in microwave radios.

For engineers reviewing the HMC144LC4TR datasheet, HMC144LC4TR pinout, HMC144LC4TR application, or HMC144LC4TR equivalent, key selection criteria include its broadband 6–20 GHz RF/LO range, leadless 4×4 mm RoHS-compliant SMT package, DC-coupled IF port requiring ≤±2 mA current, and absence of external baluns or DC bias components.

Technical Context

The HMC144LC4TR integrates on-chip baluns for broadband operation without external components, supporting both upconversion and downconversion modes. Its monolithic GaAs construction ensures consistent conversion loss and isolation across production lots, replacing hybrid diode mixers with higher reliability and surface-mount compatibility.

It operates with +20 dBm LO drive, exhibits 25–35 dB LO-to-RF isolation and 15–25 dB RF-to-IF isolation, and maintains stable performance from –40°C to +85°C. The DC-coupled IF port enables baseband and low-IF architectures, while AC-coupled 50 Ω RF and LO ports simplify impedance matching.

Key Specifications

Pinout & Package

Package: 4×4 mm leadless surface-mount package with alumina body, gold-over-nickel plating, and exposed ground paddle requiring PCB soldering per MSL3 handling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC144LC4TR, HMC1048LC4 offers proven compatibility in existing Hittite designs but sacrifices 2 GHz upper-band coverage and 1 dB IP3, while QM11030 extends low-frequency reach and improves conversion efficiency at the cost of larger package size and non-drop-in layout adaptation.

Availability

HMC144LC4TR is available at Aetrix Electronics and suitable for point-to-point radios, VSAT terminals, and test equipment requiring stable component supply, long-term obsolescence management, and traceable sourcing for aerospace-grade builds.

Supply support for HMC144LC4TR 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, integrating its high-frequency RF/Microwave portfolio into ADI's broader signal chain solutions.

The HMC144LC4TR belongs to Hittite's GaAs MMIC mixer product line, designed specifically for broadband microwave communication systems demanding high isolation, linearity, and surface-mount manufacturability without external baluns.

FAQ

What is the recommended LO drive level for optimal performance of the HMC144LC4TR?

The HMC144LC4TR is characterized and optimized for +20 dBm LO drive. At this level, it achieves 11.5 dB typical conversion loss, +23 dBm input IP3, and 35 dB LO/RF isolation. Lower LO drive (e.g., +17 dBm) increases conversion loss by ~1–2 dB and degrades IP3 by ~2–3 dB, while exceeding +20 dBm risks compression or reliability impact. HMC144LC4TR must not be operated above +27 dBm LO per absolute maximum ratings.

Can the HMC144LC4TR be used for zero-IF (direct-conversion) receiver applications?

Yes, the HMC144LC4TR supports zero-IF operation via its DC-coupled IF port. However, the IF port must not source or sink more than ±2 mA DC current to avoid die damage. For true DC-coupled baseband interfaces, external current-limiting circuitry or bias-T networks are required. HMC144LC4TR's DC–3 GHz IF bandwidth enables full baseband capture without high-pass filtering limitations.

Does the HMC144LC4TR require external baluns or DC blocking components?

No. The HMC144LC4TR integrates on-chip baluns for both RF and LO ports, eliminating the need for external transformers or lumped baluns. Its RF and LO ports are AC-coupled and 50 Ω matched from 6–20 GHz, requiring no external DC blocking. Only the IF port may need external DC blocking if operation above DC is not required - but that is optional, not mandatory.

What is the grounding requirement for the HMC144LC4TR's exposed paddle and ground pins?

All ground pins (2, 4, 8, 10, 15, 17) and the exposed ground paddle must be soldered directly to a solid RF/DC ground plane using multiple thermal vias. Inadequate paddle soldering causes degraded isolation, increased conversion loss, and thermal instability. HMC144LC4TR's performance specifications assume full paddle attachment per the manufacturer's outline drawing and evaluation board guidelines.

Is the HMC144LC4TR pin-compatible with other Hittite mixer variants like the HMC1048LC4?

No, the HMC144LC4TR is not pin-compatible with HMC1048LC4. Although both use 4×4 mm leadless packages, their pin functions differ: HMC144LC4TR assigns pin 9 to IF and pin 16 to LO, whereas HMC1048LC4 uses different pin allocations for RF, LO, and IF. Layout redesign and schematic updates are required when substituting HMC144LC4TR for HMC1048LC4 or vice versa.