Analog Devices Inc. HMC337-SX

Overview

HMC337-SX from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC sub-harmonically pumped (×2) mixer with integrated LO amplifier, designed for RF-to-IF downconversion or IF-to-RF upconversion in 17–25 GHz systems. It delivers 9–13 dB conversion loss, >25 dB 2LO-to-RF isolation, and operates with only –5 dBm LO drive at +3V to +4V supply. It is used in 18/23 GHz microwave radios and satellite communication transceivers.

For engineers reviewing the HMC337-SX datasheet, HMC337-SX pinout, HMC337-SX application, or HMC337-SX equivalent, this page provides verified technical context, die-level packaging details, real-world isolation and linearity performance, and validated alternatives for millimeter-wave radio design.

Technical Context

The HMC337-SX implements a sub-harmonic (×2) LO architecture that eliminates need for fundamental LO filtering by leveraging high 2LO-to-RF isolation (>25 dB). Its integrated two-stage GaAs PHEMT LO amplifier enables operation with only –5 dBm input drive across 8.5–12.5 GHz LO range.

It supports DC–3 GHz IF bandwidth and exhibits measured input IP3 of 2–10 dBm and P1dB of –6 to –1 dBm under +3V/+4V bias. All RF, LO, and IF ports are 50 Ω matched - RF and LO AC-coupled, IF DC-coupled (requires external series blocking capacitor).

Key Specifications

Pinout & Package

Package: Bare die, 1.32 × 0.97 × 0.1 mm, gold-metallized bond pads (0.100 mm²), backside grounded. Requires eutectic or conductive epoxy mounting and 3-mil ribbon bonding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC1048-SX and QM11024, the HMC337-SX uniquely combines integrated LO amplification, sub-harmonic pumping, and verified >25 dB 2LO-to-RF isolation - enabling simpler, more compact 17–25 GHz radio front ends without sacrificing linearity or temperature stability.

Availability

HMC337-SX is available at Aetrix Electronics and suitable for 18/23 GHz microwave radios, satellite communication transceivers, and millimeter-wave test equipment requiring stable component supply across extended temperature ranges (–55°C to +85°C).

Supply support for HMC337-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 maintains its high-frequency RF IC portfolio, specializing in mmWave, microwave, and RF solutions for communications, defense, and instrumentation.

The HMC337-SX belongs to Hittite's legacy GaAs MMIC mixer family, engineered specifically for compact, high-isolation sub-harmonic mixing in E-band wireless infrastructure and aerospace systems.

FAQ

What is the recommended LO drive level for optimal performance of the HMC337-SX?

The HMC337-SX is characterized with –5 dBm LO drive at both +3V and +4V Vdd. This level delivers nominal conversion loss (9–13 dB) and noise figure (9–13 dB) across 17–25 GHz RF and 8.5–12.5 GHz LO bands. Deviating significantly from –5 dBm may degrade IP3 or increase conversion loss; data shows best linearity near –5 dBm across temperature.

Can the HMC337-SX be used as both an upconverter and downconverter?

Yes, the HMC337-SX is bidirectional: it functions as a downconverter (RF→IF) or upconverter (IF→RF) depending on signal routing. All published specs - including conversion loss, isolation, and IP3 - are measured in downconverter mode (IF = 1 GHz), but the sub-harmonic architecture supports symmetric operation in either direction per the functional diagram and interface schematic.

What is the required external DC blocking capacitor value for the IF port of the HMC337-SX?

The IF port of the HMC337-SX is DC-coupled and must be externally DC-blocked using a series capacitor. The value must pass the full DC–3 GHz IF bandwidth; a 100 pF NP0/C0G capacitor is commonly used, though exact value depends on lowest IF frequency needed. Applying DC voltage directly to the IF pad will cause non-function or permanent die failure.

Does the HMC337-SX require a heatsink or special thermal management?

The HMC337-SX has a maximum continuous power dissipation of 238 mW at Ta = 85°C, derating 2.64 mW/°C above that. At typical Idd = 25–50 mA and Vdd = +3V to +4V, power dissipation is 75–200 mW. While not requiring a dedicated heatsink, it must be mounted eutectically or with conductive epoxy to a thermally robust ground plane; die backside is metallized for direct thermal conduction.

Is the HMC337-SX pin-compatible with other Hittite mixer die such as the HMC1048-SX?

No, the HMC337-SX is not pin-compatible with the HMC1048-SX. The HMC337-SX has four terminals (Vdd, RF, IF, LO) arranged per its outline drawing and assembly diagram; the HMC1048-SX uses a different pad layout, die size (1.5 × 1.1 mm), and lacks integrated LO amplification - requiring separate LO input and bias paths. Direct substitution would necessitate PCB redesign.