Analog Devices Inc. HMC260-SX

Overview

HMC260-SX from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC double-balanced passive mixer operating from 14 to 26 GHz RF/LO and DC–8 GHz IF, delivering 10.5 dB typical conversion loss, +20 dBm input IP3, and 40 dB LO/RF isolation in a 12-lead 3×3 mm ceramic SMT package. It functions as an upconverter or downconverter in millimeter-wave radio transceivers without external matching or DC bias.

For engineers reviewing the HMC260-SX datasheet, HMC260-SX pinout, HMC260-SX application, or HMC260-SX equivalent, this page provides verified RF performance data, thermal limits, ground-critical pin assignments, and real-world deployment context for point-to-point radios, test instrumentation, and military EW systems.

Technical Context

The HMC260-SX employs optimized on-chip balun structures to achieve high LO-to-RF and LO-to-IF suppression across its full 14–26 GHz band. Its passive architecture eliminates DC bias requirements and enables operation with LO drive levels from +9 to +15 dBm.

It supports wideband IF output from DC to 8 GHz with no internal blocking capacitors; the IF port must be externally DC-blocked unless operating to DC with ≤2 mA current sourcing/sinking. Thermal resistance is 253 °C/W (junction-to-ground paddle), requiring direct PCB ground paddle soldering per MSL3 reflow profile.

Key Specifications

Pinout & Package

12-lead leadless ceramic SMT package (3×3 mm, 9 mm² body, alumina substrate, gold-over-nickel plating); ground paddle must be soldered to PCB RF ground plane with multiple vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC1048LC3B and QPC1006, the HMC260-SX delivers the best balance of K/Ka-band conversion loss, isolation, and compact 3×3 mm footprint-making it optimal for space-constrained, high-frequency radios where thermal management and layout simplicity are critical.

Availability

HMC260-SX is available at Aetrix Electronics and suitable for point-to-point radios, test equipment, military EW systems, and VSAT terminals requiring stable component supply across extended temperature ranges and high-frequency RF performance.

Supply support for HMC260-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 portfolio, specializing in GaAs and SiGe MMICs for defense, communications, and instrumentation markets.

The HMC260-SX belongs to Hittite's legacy fundamental mixer product line, engineered specifically for millimeter-wave wireless infrastructure and electronic warfare systems demanding high isolation, wide IF bandwidth, and zero-bias operation.

FAQ

What is the recommended LO drive level for optimal performance of the HMC260-SX?

The HMC260-SX operates optimally with LO drive between +9 dBm and +15 dBm. At +13 dBm, it achieves typical 10.5 dB conversion loss and 40 dB LO/RF isolation. Drive below +9 dBm increases conversion loss and degrades IP3; above +15 dBm risks exceeding absolute maximum ratings. The HMC260-SX datasheet specifies +13 dBm as the reference condition for all key RF parameters.

Can the HMC260-SX be used for DC-coupled IF operation, and what are the limits?

Yes, the HMC260-SX IF port supports true DC-coupled operation, but the device must not source or sink more than ±2 mA DC current at Pin 5 (IF). Exceeding this limit may cause non-function or permanent damage. For AC-coupled IF use, a series capacitor sized for the target IF bandwidth must be placed externally. The HMC260-SX does not include internal DC blocking.

Does the HMC260-SX require external matching components or bias circuitry?

No. The HMC260-SX is a fully matched, passive GaAs MMIC mixer with all ports (RF, LO, IF) DC-coupled and impedance-matched to 50 Ω. It requires no external bias, DC blocking, matching networks, or baluns. This simplifies design and reduces bill-of-materials cost-confirmed in the HMC260-SX functional description and evaluation board documentation.

What is the thermal management requirement for reliable operation of the HMC260-SX?

The HMC260-SX has a junction-to-ground-paddle thermal resistance of 253 °C/W. To maintain channel temperature ≤150 °C, the exposed ground paddle must be soldered to a thermally robust PCB ground plane using multiple vias, and the assembly must be mounted on an appropriate heat sink in high-power applications. Derating begins above +85 °C ambient (260 mW max at +85 °C, reduced by 3.95 mW/°C).

Is the HMC260-SX pin-compatible with other Hittite mixer variants like the HMC260LC3B?

Yes-the HMC260-SX and HMC260LC3B share identical 12-lead 3×3 mm ceramic package outlines, pin numbering, and terminal functions. Both are marked "H260" on-package and specify identical pin descriptions, ground paddle requirements, and MSL3 reflow profiles. The HMC260-SX is the industry-standard designation for the same die and package as HMC260LC3B.