Analog Devices Inc. 105976-HMC329LM3

Overview

HMC329LM3 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC double-balanced passive mixer for 26–40 GHz RF/LO and DC–8 GHz IF operation, delivering 9–11 dB conversion loss, +19 dBm input IP3, and 30–37 dB LO/RF isolation in a leadless SMT package - ideal for millimeter-wave up/downconversion in SATCOM transceivers.

For engineers reviewing the HMC329LM3 datasheet, HMC329LM3 pinout, HMC329LM3 application, or HMC329LM3 equivalent, key selection criteria include its bias-free operation, 50 Ω DC-coupled RF/LO ports, ±2 mA IF current limit, -40 to +85 °C operating range, and LM3 package compatibility with CPWG PCB transitions.

Technical Context

The HMC329LM3 employs on-chip baluns to achieve high port isolations without external components, enabling direct integration into 26–40 GHz signal chains as either upconverter or downconverter. Its passive architecture eliminates DC bias requirements and simplifies thermal design.

Performance is characterized at TA = +25 °C with LO = +13 dBm and IF = 1 GHz; conversion gain varies with frequency and temperature, and spurious outputs (e.g., mRF ± nLO) are suppressed to ≤ -67 dBc across the band - critical for low-noise radar and point-to-point radio front-ends.

Key Specifications

Pinout & Package

Package: LM3 leadless chip carrier, 25 mm², gold-over-nickel plating, plastic body; requires full soldering of base to PCB RF ground per Note 5 in outline drawing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar passive mmWave mixer applications.

Compared with HMC1048LP3E and QPC1006, the HMC329LM3 delivers best-in-class conversion loss and isolation specifically within 26–40 GHz, with minimal design overhead due to its zero-bias operation and proven LM3 mounting process - making it optimal for cost-sensitive, high-volume E-band radios.

Availability

HMC329LM3 is available at Aetrix Electronics and suitable for point-to-point radios, SATCOM terminals, and RADAR transceivers requiring stable component supply across industrial temperature ranges and millimeter-wave frequency bands.

Supply support for HMC329LM3 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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and RF technologies for communications, industrial, and aerospace markets.

The HMC329LM3 belongs to Analog Devices' legacy Hittite MMIC mixer product line, engineered for millimeter-wave infrastructure where passive, bias-free, and repeatable SMT integration are mandatory - particularly in E-band wireless and defense systems.

FAQ

Does the HMC329LM3 require DC bias voltage or current to operate?

No, the HMC329LM3 is a passive double-balanced mixer and requires no DC bias. It operates solely on RF, LO, and IF signal energy. This eliminates need for bias tees, decoupling capacitors, or power regulation circuitry - reducing design complexity and board space in mmWave front-ends. The HMC329LM3 functions reliably across its full 26–40 GHz range without any external power applied to the device.

What is the maximum allowable DC current at the IF port of the HMC329LM3?

The HMC329LM3 IF port must not source or sink more than ±2 mA of DC current. Exceeding this limit risks non-function or permanent damage. For DC-coupled IF operation, ensure external circuitry limits current to this range; for AC-coupled use above ~1 MHz, a series capacitor sized for the IF bandwidth is recommended. This specification is explicitly defined in the Absolute Maximum Ratings table for the HMC329LM3.

Can the HMC329LM3 be used for both upconversion and downconversion?

Yes, the HMC329LM3 is bidirectional and functions identically as an upconverter or downconverter. Its symmetric double-balanced architecture allows RF and IF ports to be interchanged depending on system architecture. All published specifications - including conversion loss, isolation, and IP3 - apply to both configurations when operated within rated frequency and power conditions. This flexibility is confirmed in the General Description section of the HMC329LM3 datasheet.

What package type does the HMC329LM3 use, and what are the PCB mounting requirements?

The HMC329LM3 uses the LM3 leadless chip carrier package (25 mm², plastic body, gold-over-nickel plating). Per datasheet Note 5, the entire package base must be soldered to a solid PCB RF ground plane. Recommended land pattern and CPWG transition details are provided in the HMC329LM3 evaluation board documentation to maintain 50 Ω impedance and minimize parasitic inductance at mmWave frequencies.

Is the HMC329LM3 pin-compatible with other LM3-packaged mixers like the HMC1048LP3E?

Yes, the HMC329LM3 shares identical pin numbering, terminal functions, and land pattern with the HMC1048LP3E - both use the standard 6-pin LM3 footprint with pins 1–3 as N/C, pin 4 as RF, pin 5 as IF, and pin 6 as LO. However, electrical performance differs significantly: HMC329LM3 is optimized for 26–40 GHz with lower conversion loss, while HMC1048LP3E covers 10–40 GHz with higher loss. Mechanical compatibility does not guarantee functional interchangeability in all designs.