Analog Devices Inc. HMC329ALC3B

Overview

HMC329ALC3B from Analog Devices is a GaAs MMIC double-balanced mixer operating from 24 GHz to 32 GHz, delivering 11 dB typical conversion loss (downconverter), 20 dBm typical input IP3, and 36.5 dB typical LO-to-RF isolation (24–30 GHz). It functions as both upconverter and downconverter with dc–8 GHz IF bandwidth and requires no external matching components - deployed in microwave VSAT radios, military EW systems, and test equipment.

For engineers reviewing the HMC329ALC3B datasheet, HMC329ALC3B pinout, HMC329ALC3B application, or HMC329ALC3B equivalent, key selection criteria include its 12-terminal LCC package, LO drive requirement ≥9 dBm, RF/LO port 50 Ω ac-coupling, IF port dc-coupling with ±3 mA current limit, and thermal performance governed by θJA = 120°C/W under natural convection.

Technical Context

The HMC329ALC3B employs a double-balanced topology with integrated balun structures optimized for high LO-to-RF and LO-to-IF suppression across 24–32 GHz. Its passive GaAs MMIC design eliminates bias circuitry and enables operation without external matching networks.

It supports both upper- and lower-sideband configurations: downconversion from 24–32 GHz RF to dc–8 GHz IF, and upconversion from dc–8 GHz IF to 24–32 GHz RF. Performance is characterized at LO = 13 dBm, with stable conversion gain and IP3 over −40°C to +85°C.

Key Specifications

Pinout & Package

The HMC329ALC3B uses a 12-terminal ceramic leadless chip carrier (LCC) package (E-12-4), 3 mm × 3 mm footprint, with an exposed thermal pad requiring RF/dc ground connection. Pin 1 is marked on top view; all GND pins must be soldered to solid ground plane for optimal RF performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC329ALC3B, the HMC554ALC3B delivers lower conversion loss at higher LO drive, while the QPC1006 extends RF range and offers differential IF capability - neither is pin-compatible, and each demands distinct LO drive, biasing, or layout adaptations.

Availability

HMC329ALC3B is available at Aetrix Electronics and suitable for microwave VSAT radios, electronic warfare receivers, and millimeter-wave test equipment requiring stable component supply across extended temperature ranges and high-frequency performance consistency.

Supply support for HMC329ALC3B 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 is a global leader in high-performance analog, mixed-signal, and RF ICs, serving communications, defense, instrumentation, and industrial markets with precision signal processing solutions.

The HMC329ALC3B belongs to Analog Devices' Hittite Microwave MMIC product line, engineered specifically for Ka-band wireless infrastructure, defense radar, and test instrumentation demanding broadband, high-isolation mixing performance.

FAQ

What is the minimum LO drive level required for specified performance of the HMC329ALC3B?

The HMC329ALC3B requires a minimum LO drive of 9 dBm to achieve its specified conversion loss, IP3, and isolation performance across 24–32 GHz. At 9 dBm, conversion loss increases by ~1.5 dB versus the 13 dBm typical condition, and IP3 degrades by ~2 dB. Operation below 9 dBm is not characterized and may result in unstable conversion gain or increased distortion.

Can the HMC329ALC3B be used for dc-coupled IF applications?

Yes, the HMC329ALC3B supports dc-coupled IF operation because its IF port is internally dc-coupled. However, the IF pin must not source or sink more than ±3 mA of current - exceeding this limit risks die malfunction or permanent damage. For ac-coupled use, a series capacitor sized for the target IF bandwidth should be added externally.

Does the HMC329ALC3B require external matching components?

No, the HMC329ALC3B does not require external matching components. Its RF and LO ports are internally ac-coupled and matched to 50 Ω, and the IF port is dc-coupled. The device is fully functional as a drop-in component when properly grounded via all GND pins and the exposed thermal pad - no baluns, transformers, or tuning stubs are needed.

What is the thermal resistance and recommended PCB layout for the HMC329ALC3B?

The HMC329ALC3B has θJA = 120°C/W (natural convection) and θJC = 445°C/W. To achieve rated thermal performance, the exposed pad must be soldered to a solid RF ground plane using ≥6 thermal vias (0.3 mm diameter) connecting to inner/ground layers. Signal traces must maintain 50 Ω impedance, and GND pins 1,3,4,6,7,9 must be individually low-inductance connected to the same ground plane.

Is the HMC329ALC3B suitable for both upconversion and downconversion?

Yes, the HMC329ALC3B is a bidirectional double-balanced mixer qualified for both upconversion (IF → RF) and downconversion (RF → IF) across its full 24–32 GHz RF range and dc–8 GHz IF bandwidth. Typical upconverter conversion loss is 10.5 dB at IF = 1000 MHz, and it maintains >15 dBm IP3 in both modes - verified per datasheet Figures 36–55.