Analog Devices Inc. HMC347

Overview

HMC347 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SPDT non-reflective switch operating from DC to 20 GHz, delivering 1.6 dB typical insertion loss and >40 dB isolation at 20 GHz with -5/0 V dual negative control logic. It features coplanar RF I/Os, zero current consumption, and no external V_EE, enabling direct integration into broadband microwave front-ends for fiber-optic transceivers and military radar modules.

For engineers reviewing the HMC347 datasheet, HMC347 pinout, HMC347 application, or HMC347 equivalent, key selection criteria include its DC–20 GHz bandwidth, non-reflective architecture, 1.3 × 0.8 mm die size, -55°C to +85°C operating temperature range, and compatibility with 50 Ω microstrip layouts requiring minimal bond-wire inductance.

Technical Context

The HMC347 implements a monolithic GaAs MESFET-based SPDT topology with on-chip via-hole grounding to achieve broadband non-reflective termination in both "ON" and "OFF" states. Its control interface uses two independent -5/0 V logic lines (CTRLA/CTRLB) with no static current draw and no external bias supply required.

Designed for RF signal routing in high-frequency systems, the HMC347 maintains stable RF performance across temperature (–55°C to +85°C) and supports 19 dBm input P1dB and 38 dBm IP3 over 0.5–20 GHz - critical for low-distortion switching in VSAT uplinks and microwave radio transceivers.

Key Specifications

Pinout & Package

Package: Unpackaged GaAs MMIC die, dimensions 1.3 mm × 0.8 mm × 0.1 mm, back-metallized for direct thermal and RF grounding. Requires Waffle Pack (WP-8) or custom die packaging per application.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC547LP3E and QM11036, the HMC347 offers the smallest footprint and zero static current but requires bare-die handling and negative control logic - making it optimal for space-constrained, low-power, high-isolation hybrid microwave assemblies rather than standard PCB designs.

Availability

HMC347 is available at Aetrix Electronics and suitable for fiber-optic transceivers, microwave radio systems, military radar modules, and VSAT outdoor units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HMC347 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 precision signal processing and connectivity.

The HMC347 belongs to the Hittite Microwave legacy GaAs MMIC switch product line, engineered for broadband, high-isolation RF signal routing in defense, aerospace, and communications infrastructure where die-level integration and DC–20 GHz performance are critical.

FAQ

What is the operating voltage range for the HMC347 control inputs?

The HMC347 control inputs (CTRLA and CTRLB) operate with a logic range of –5 V (active low) to 0 V (inactive), with absolute maximum ratings from +0.5 V to –7.5 V DC. No current flows through the control pins under steady-state conditions, eliminating power supply requirements beyond the logic driver. This specification is confirmed in the Absolute Maximum Ratings table and Truth Table of the official HMC347 datasheet v04.0907.

Does the HMC347 require an external V_EE supply?

No, the HMC347 requires no external V_EE or bias supply - it operates solely from the –5 V / 0 V control voltages and draws zero static current. This is explicitly stated in the General Description: "requires no Vee and has no current consumption." The die's GaAs MESFET architecture enables fully self-biased operation, simplifying power delivery in compact RF modules where the HMC347 is deployed.

What is the thermal resistance of the HMC347 in the insertion loss path?

The thermal resistance of the HMC347 in the insertion loss path is 440 °C/W, as specified in the Absolute Maximum Ratings table. This value reflects junction-to-ground thermal impedance when mounted to an RF ground plane using AuSn eutectic or conductive epoxy. Proper thermal management is essential for reliability at elevated RF power levels, especially near the +27 dBm absolute maximum RF input rating.

Can the HMC347 be used below DC (sub-Hz frequencies)?

Yes, the HMC347 is rated for true DC operation - its "DC – 20 GHz" frequency range includes 0 Hz, enabling use in baseband and low-frequency RF switching applications such as IF routing and calibration path selection. The coplanar, DC-coupled I/O structure supports this capability, though external blocking capacitors are required if any RF port exhibits non-zero DC potential relative to ground.

What ESD precautions apply to the HMC347?

The HMC347 is classified as Class 1A ESD-sensitive per HBM, requiring strict handling per the manufacturer's guidelines: storage in dry nitrogen after opening ESD bags, avoidance of liquid cleaning, use of vacuum collets or bent tweezers only on chip edges, and suppression of bias supply transients. These requirements are documented in the Handling Precautions section of the HMC347 datasheet v04.0907 and remain valid for all units of the HMC347 regardless of distribution channel.