Analog Devices Inc. HMC265-SX

Overview

HMC265-SX from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC sub-harmonically pumped (x2) downconverter mixer operating from 20–31 GHz RF, with integrated LO amplifier and IF amplification in a leadless SMT package. It delivers 3 dB typical conversion gain, 13 dB SSB noise figure, >28 dB 2LO-to-RF isolation, and requires only –4 dBm LO drive at +4 V supply - enabling compact, high-isolation microwave radio front-ends.

For engineers reviewing the HMC265-SX datasheet, HMC265-SX pinout, HMC265-SX application, or HMC265-SX equivalent, this device is selected for millimeter-wave point-to-point radios, LMDS base stations, SATCOM downconverters, and systems requiring minimal external filtering due to its high 2LO/RF and 2LO/IF isolations.

Technical Context

The HMC265-SX implements a sub-harmonic (x2) mixing architecture where the LO input operates at half the RF frequency (10–15.5 GHz), reducing LO synthesis complexity. Its monolithic GaAs design integrates a two-stage LO amplifier and IF amplifier on-die, eliminating wirebonding and ensuring repeatable RF performance across production units.

It operates as a single-supply (+3 V to +4 V) downconverter with AC-coupled 50 Ω RF, LO, and IF ports. The 2LO-to-RF isolation exceeds 28 dB across 20–31 GHz, and 2LO-to-IF isolation reaches 47 dB - enabling direct connection to IF ADCs without additional harmonic filtering.

Key Specifications

Pinout & Package

The HMC265-SX is housed in the LM3 leadless chip carrier package (3.0 × 3.0 × 0.1 mm), with gold-over-nickel plating and plastic body. All ground pins must be soldered directly to PCB RF ground plane per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC265-SX, HMC1048LP3E trades integrated LO amplification for higher linearity and broader RF coverage, while QPC1006 provides higher gain at +5 V but increases supply current - making HMC265-SX optimal for +3–+4 V, space-constrained E-band radios prioritizing isolation and LO drive simplicity.

Availability

HMC265-SX is available at Aetrix Electronics and suitable for 20–31 GHz point-to-point radios, LMDS infrastructure, and SATCOM terminals requiring stable component supply, consistent RF performance, and qualified SMT assembly support.

Supply support for HMC265-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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and RF technologies for communications, defense, and instrumentation markets.

The HMC265-SX belongs to Analog Devices' legacy Hittite Microwave MMIC mixer product line, engineered specifically for millimeter-wave wireless infrastructure requiring high isolation, low LO drive, and robust SMT integration.

FAQ

What is the recommended LO drive level for optimal performance of the HMC265-SX?

The HMC265-SX achieves best conversion gain and isolation with –4 dBm LO drive at +4 V supply. Performance remains functional from –8 dBm to 0 dBm, but gain drops below –6 dBm and compression increases above –2 dBm. The HMC265-SX datasheet specifies –4 dBm as the nominal LO drive condition for all key specs including noise figure and IP3.

Does the HMC265-SX require external filtering between LO and RF paths?

No - the HMC265-SX provides >28 dB 2LO-to-RF isolation and >39 dB 2LO-to-IF isolation across 20–31 GHz, eliminating the need for external diplexers or harmonic filters in most implementations. This is enabled by its sub-harmonic architecture and monolithic GaAs layout, as confirmed in the HMC265-SX evaluation data and isolation plots.

What is the operating temperature range for the HMC265-SX?

The HMC265-SX is specified for continuous operation from –40 °C to +85 °C. Electrical parameters such as conversion gain and noise figure are characterized at +25 °C, but thermal stability data shows <1 dB gain variation from –40 °C to +85 °C under nominal bias, per HMC265-SX temperature sweep measurements.

Can the HMC265-SX be used in an upconversion configuration?

No - the HMC265-SX is designed and characterized exclusively as a downconverter (RF → IF). Its internal LO amplifier, bias network, and port matching are optimized for RF input and IF output. Upconversion is not supported, and no upconversion specifications (e.g., sideband suppression, LO-to-RF gain) are provided for the HMC265-SX.

What PCB layout practices are critical for achieving specified HMC265-SX performance?

Ground vias must surround the LM3 pad; RF/LO/IF traces require grounded coplanar waveguide (CPWG) transitions with 0.005" gap to ground; Vdd requires a 100–330 pF bypass capacitor placed within 0.5 mm of pin 3; and all ground pins (pin 7 and optional pins 1/2) must be soldered to a solid RF ground plane - as defined in the HMC265-SX evaluation board layout and land pattern documentation.