Analog Devices Inc. HMC144-SX

Overview

HMC144-SX from Hittite Microwave Corporation is a GaAs MMIC double-balanced mixer die operating from 5 to 20 GHz RF/LO and DC–3 GHz IF, delivering +25 dBm input IP3, 30 dB LO/RF isolation, and 12 dB typical conversion loss. It serves as a compact, bias-free upconverter/downconverter in microwave radio front-ends requiring high linearity and image-reject module integration.

For engineers reviewing the HMC144-SX datasheet, HMC144-SX pinout, HMC144-SX application, or HMC144-SX equivalent, this page provides verified RF performance data, validated die-level terminal mapping, confirmed mirror-layout differentiation from HMC143, and real-world selection guidance for point-to-point radios and VSAT systems.

Technical Context

The HMC144-SX implements a monolithic double-balanced architecture using 1 μm GaAs MESFET process, integrating on-chip baluns for broadband operation without external components or DC bias. Its mirror-image layout relative to HMC143 enables optimized placement in image-reject mixer modules.

It achieves RF/IF isolation improvement over HMC141/142 via an integrated IF combiner, supports LO drive levels from +13 to +20 dBm, and maintains stable SSB noise figure (10–12 dB) and conversion gain across –55°C to +85°C operating temperature range.

Key Specifications

Pinout & Package

Package: Bare GaAs MMIC die in WP-4 standard packaging (0.004″ thickness, gold backside and bond pads, grounded backside metallization).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC143-SX and QM11013, the HMC144-SX uniquely delivers mirror-layout optimization for image-reject topologies without bias circuitry, making it the preferred choice for compact, high-isolation RF module designs where layout symmetry and simplicity are critical.

Availability

HMC144-SX is available at Aetrix Electronics and suitable for microwave point-to-point radios, VSAT terminals, and radar transceiver modules requiring stable component supply and legacy GaAs MMIC performance.

Supply support for HMC144-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

Hittite Microwave Corporation, now part of Analog Devices, specialized in high-frequency RF ICs and MMICs for defense, communications, and test equipment markets before its 2014 acquisition.

The HMC144-SX belongs to Hittite's legacy GaAs double-balanced mixer product line, engineered specifically for compact, high-isolation microwave front-ends in licensed spectrum infrastructure where hybrid diode mixers were previously used.

FAQ

What is the primary functional difference between HMC144-SX and HMC143-SX?

The HMC144-SX features a mirror-image bond pad layout compared to the HMC143-SX, with LO and RF pads swapped. This allows symmetrical placement in image-reject mixer modules without signal crossover. All electrical specifications-including +25 dBm input IP3, 30 dB LO/RF isolation, and DC–3 GHz IF bandwidth-are identical between HMC144-SX and HMC143-SX. The HMC144-SX is not a drop-in replacement for HMC143-SX due to the reversed pad orientation; PCB layout must be adjusted accordingly.

Does the HMC144-SX require DC bias voltage or current to operate?

No, the HMC144-SX operates without any external DC bias. Its GaAs MESFET core is self-biased, eliminating the need for bias tees, resistors, or active regulation circuits. This simplifies RF layout and improves reliability in high-frequency applications. However, the IF port must not source or sink more than ±2 mA DC current, as exceeding this limit risks die failure. The backside ground must be solidly connected to system RF ground for proper operation.

What is the maximum allowable LO drive level for the HMC144-SX?

The absolute maximum LO drive level for the HMC144-SX is +27 dBm, but the device is characterized and optimized for +20 dBm LO drive. At +20 dBm, it achieves +25 dBm input IP3, 30 dB LO/RF isolation, and 12 dB typical conversion loss. Driving above +20 dBm may improve linearity marginally but increases risk of compression and thermal stress. Operation beyond +27 dBm violates absolute maximum ratings and may cause permanent damage to the HMC144-SX die.

Can the HMC144-SX be used for both upconversion and downconversion?

Yes, the HMC144-SX is fully bidirectional and functions identically as an upconverter or downconverter. Its double-balanced architecture and symmetric port matching (50 Ω AC-coupled LO and RF, DC-coupled IF) support either mode without modification. In upconversion, the IF port accepts baseband or low-IF signals (DC–3 GHz), while RF and LO ports generate the translated RF output. In downconversion, RF and LO inputs produce the IF output. Performance metrics such as conversion loss and IP3 apply equivalently in both directions.

Is the HMC144-SX still in active production or considered obsolete?

The HMC144-SX is marked "OBSOLETE" in its official datasheet revision v05.1007, indicating discontinuation by Hittite (now Analog Devices). However, Aetrix Electronics maintains legacy inventory and offers controlled-life-cycle sourcing for ongoing production programs. No functional replacements or second sources are endorsed by Analog Devices. Customers should consult Aetrix for remaining stock levels, last-time-buy options, and long-term obsolescence mitigation planning for the HMC144-SX.