Analog Devices Inc. 112405-HMC575LP4

Overview

The 112405-HMC575LP4 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC x2 active frequency multiplier IC designed for LO multiplication in RF signal chains. It accepts 3–4.5 GHz input, delivers +17 dBm typical output across 6–9 GHz, provides 15 dBc Fo/3Fo isolation, and operates from a single +5 V supply drawing 90 mA - ideal for point-to-point radio transceivers.

For engineers reviewing the 112405-HMC575LP4 datasheet, 112405-HMC575LP4 pinout, 112405-HMC575LP4 application, or 112405-HMC575LP4 equivalent, key selection criteria include its 6–9 GHz output bandwidth, -140 dBc/Hz SSB phase noise at 100 kHz offset, DC-blocked 50 Ω matched I/Os, RoHS-compliant 4×4 mm QFN package, and compatibility with surface-mount manufacturing.

Technical Context

This device implements a broadband GaAs PHEMT-based x2 multiplication architecture with integrated bias networks and on-chip DC blocking. Its input is matched to 50 Ω over 3–4.5 GHz, and output is matched to 50 Ω over 6–9 GHz, enabling direct integration into 50 Ω RF systems without external matching.

It features dual 5 V supply inputs (Vdd1/Vdd2), requires external 100 pF and 2.2 μF bypass capacitors per supply rail, and maintains stable output power across -40°C to +85°C operating temperature - supporting military, space, and high-reliability instrumentation applications.

Key Specifications

Pinout & Package

Package: 4×4 mm, 24-lead leadless QFN (RoHS-compliant low-stress molded plastic), exposed ground paddle requiring solder connection to PCB RF ground.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar active frequency multiplier applications.

Compared with HMC1089LP4E and QM11036, the 112405-HMC575LP4 offers optimal balance of output power, phase noise, and +5 V simplicity for compact C-band radios - making it preferred for space-constrained, thermally sensitive VSAT and wireless infrastructure designs.

Availability

112405-HMC575LP4 is available at Aetrix Electronics and suitable for point-to-point radios, VSAT terminals, and test instrumentation requiring stable component supply, consistent RF performance, and RoHS-compliant SMT packaging.

Supply support for 112405-HMC575LP4 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 leader in high-performance analog, mixed-signal, and RF ICs, formed through the acquisition of Hittite Microwave in 2014.

The HMC575LP4 belongs to Analog Devices' legacy Hittite GaAs MMIC frequency multiplier product line, engineered specifically for high-linearity, low-phase-noise LO generation in microwave communication and defense systems.

FAQ

What is the recommended input drive level for optimal performance of the 112405-HMC575LP4?

The 112405-HMC575LP4 is specified for optimal output power and isolation with a +3 dBm input drive level. It supports an input range of -2 dBm to +6 dBm; operation below -2 dBm reduces output power and may degrade Fo isolation, while exceeding +6 dBm risks compression or damage. The 112405-HMC575LP4 datasheet confirms +17 dBm typical output and 15 dBc Fo isolation at +3 dBm drive under +5 V bias.

Does the 112405-HMC575LP4 require external DC blocking capacitors on its RF ports?

No - the 112405-HMC575LP4 features internally DC-blocked RFIN and RFOUT ports, both matched to 50 Ω across their respective bands (3–4.5 GHz and 6–9 GHz). This eliminates the need for external blocking capacitors in most designs, simplifying layout and preserving signal integrity. The 112405-HMC575LP4 pin description explicitly states "AC coupled and matched" for pins 3 and 16.

What is the thermal management requirement for continuous operation of the 112405-HMC575LP4?

The 112405-HMC575LP4 has a channel-to-ground-paddle thermal resistance of 127 °C/W and a maximum channel temperature of 150 °C. For continuous operation at full rated power, the exposed ground paddle must be soldered to a multilayer PCB ground plane with ≥4 thermal vias (0.3 mm diameter, spaced ≤1 mm apart). The 112405-HMC575LP4 derates 7.9 mW/°C above 85 °C ambient, so thermal design must ensure junction temperature remains within limits under worst-case +85 °C ambient and 90 mA supply current.

Can the 112405-HMC575LP4 operate from a single 5 V supply, and what bypassing is required?

Yes - the 112405-HMC575LP4 operates from a single +5 V supply applied to both Vdd1 (pin 22) and Vdd2 (pin 20). Each supply pin requires local bypassing: a 100 pF capacitor (0402) and a 2.2 μF tantalum capacitor (or equivalent low-ESR ceramic) placed within 2 mm of the pin. This configuration ensures stable bias and low-noise operation across 6–9 GHz, as verified in the 112405-HMC575LP4 application schematic and evaluation board documentation.

Is the 112405-HMC575LP4 pin-compatible with the HMC575LP4E variant?

Yes - the 112405-HMC575LP4 and HMC575LP4E share identical pinout, package dimensions, and electrical specifications. The only differences are lead finish (Sn/Pb vs. 100% matte Sn) and MSL reflow profile (235 °C vs. 260 °C peak). Both variants use the same 4×4 mm QFN package with 24 leads and exposed paddle, and the 112405-HMC575LP4 pin description applies identically to both versions per Hittite/Analog Devices package documentation.