Analog Devices Inc. 105711-HMC347LP3

Overview

105711-HMC347LP3 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SPDT non-reflective switch operating from DC to 14 GHz, delivering 1.6 dB insertion loss at 10 GHz, >50 dB isolation up to 3 GHz, and complementary -5/0 V control logic. It serves as an RF signal path selector in microwave transceivers requiring high isolation and broadband linearity.

For engineers reviewing the 105711-HMC347LP3 datasheet, 105711-HMC347LP3 pinout, 105711-HMC347LP3 application, or 105711-HMC347LP3 equivalent, key selection criteria include its non-reflective architecture, 3×3 mm QFN package with exposed paddle grounding, DC–14 GHz bandwidth, and compatibility with -5/0 V logic without external bias.

Technical Context

This SPDT switch uses GaAs MESFET technology to implement a non-reflective topology where off-state ports are terminated to 50 Ω, minimizing signal reflections during state transitions. Its complementary negative logic interface (CTLA/CTLB at -5 V / 0 V) eliminates need for level-shifting circuitry or positive supply rails.

Designed for high-frequency signal routing, it achieves 23 dBm input P1dB and +43 dBm IIP3 across 0.5–14 GHz, supporting linear operation in fiber-optic front-ends and test instrumentation. Thermal resistance of 440 °C/W (insertion path) enables stable performance under continuous RF power at +85 °C ambient.

Key Specifications

Pinout & Package

The 105711-HMC347LP3 is housed in a 3×3 mm, 16-pin leadless QFN package with exposed metal paddle for RF grounding. All ground pins (2, 4, 6, 8, 13, 15) and N/C pins (1, 5, 9, 12, 16) must be soldered to PCB RF ground per Hittite Application Note land pattern guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SPDT switch applications.

Compared with HMC132C8 and QM11036, the 105711-HMC347LP3 uniquely balances DC–14 GHz coverage, non-reflective termination, and -5/0 V logic in a 3×3 mm footprint-making it optimal for next-generation broadband test equipment and Ka-band satellite modems.

Availability

105711-HMC347LP3 is available at Aetrix Electronics and suitable for basestation infrastructure, fiber optics & broadband telecom, and microwave radio & VSAT applications requiring stable component supply, RoHS-compliant sourcing, and long-term lifecycle support.

Supply support for 105711-HMC347LP3 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 integrates its high-frequency RF portfolio into precision analog and RF solutions for communications, defense, and instrumentation markets.

The 105711-HMC347LP3 belongs to Hittite's GaAs MMIC SPDT switch product line, engineered specifically for broadband non-reflective signal routing in microwave infrastructure where isolation, linearity, and compact packaging are critical.

FAQ

What is the operating temperature range for the 105711-HMC347LP3?

The 105711-HMC347LP3 operates from -55 °C to +85 °C. Its absolute maximum channel temperature is 150 °C, and thermal resistance is specified at 440 °C/W for the insertion loss path. Derating begins above +85 °C at 2 mW/°C, ensuring reliability in outdoor basestation enclosures and military-grade radios where ambient extremes occur.

Does the 105711-HMC347LP3 require external DC blocking capacitors?

Yes, the 105711-HMC347LP3 RF ports (RFC, RF1, RF2) are DC-coupled and matched to 50 Ω, so external DC blocking capacitors are required if the RF line potential differs from 0 V. This prevents unintended DC current flow and maintains impedance integrity-critical for laser driver interfaces in fiber-optic modules.

How does the non-reflective design of the 105711-HMC347LP3 improve system performance?

The non-reflective design of the 105711-HMC347LP3 terminates off-state RF ports to 50 Ω, preventing signal reflections that cause VSWR degradation, return loss ripple, and measurement uncertainty. In test instrumentation and coherent optical systems, this directly improves measurement repeatability and reduces laser instability caused by back-reflected light.

What is the ESD rating of the 105711-HMC347LP3 and how does it impact handling?

The 105711-HMC347LP3 is rated Class 1A per HBM (Human Body Model), meaning it withstands ≥250 V ESD discharge. This allows safe handling on standard SMT assembly lines without special ionized air or wrist straps beyond typical ESD protocols-reducing yield loss during high-volume manufacturing of microwave radios and test gear.

Can the 105711-HMC347LP3 be used in place of the HMC132C8 without layout changes?

No, the 105711-HMC347LP3 cannot replace the HMC132C8 without PCB layout changes: the HMC132C8 uses a 5×5 mm package with different pin count and spacing, while the 105711-HMC347LP3 is a 3×3 mm 16-pin QFN. Though both are SPDT switches, their footprints, grounding schemes, and control voltage requirements differ significantly.