Analog Devices Inc. 105711-HMC547LP3

Overview

HMC547LP3 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SPDT non-reflective switch operating from DC to 20 GHz, delivering 1.6 dB insertion loss at 10 GHz, >50 dB isolation up to 5 GHz, and complementary -5 V/0 V control logic with no external bias supply required. It serves as a high-isolation RF signal path selector in microwave transceivers and test instrumentation.

For engineers reviewing the HMC547LP3 datasheet, HMC547LP3 pinout, HMC547LP3 application, or HMC547LP3 equivalent, key selection criteria include its non-reflective architecture, QFN 3×3 mm package with exposed ground paddle, DC–20 GHz bandwidth, and compatibility with standard 50 Ω RF systems requiring fast switching and minimal impedance discontinuity.

Technical Context

The HMC547LP3 implements a monolithic GaAs MESFET-based SPDT switch with integrated termination for non-reflective operation in both "off" states, enabling stable impedance matching across DC–20 GHz. Its complementary negative-control interface (A/B pins at -5 V/0 V) eliminates need for level-shifting circuitry or positive supply rails.

Thermal design relies on direct soldering of the exposed metal paddle and multiple ground pins (2, 4, 6, 8, 13, 15) to PCB RF ground, achieving thermal resistance of 250 °C/W on terminated paths. Absolute maximum RF input power is +30 dBm, with hot-switch capability rated at +23 dBm under -5 V control.

Key Specifications

Pinout & Package

Package: 3×3 mm leadless QFN with exposed metal paddle (MSL1, Sn/Pb finish), requiring full-solder connection of paddle and all ground pins to PCB RF ground plane per Hittite land pattern guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC547LP3E and QM11036, the HMC547LP3 offers unique advantages in negative-control simplicity and thermal reliability for Sn/Pb assembly, while maintaining best-in-class isolation below 5 GHz - making it optimal for cost-sensitive, high-isolation microwave infrastructure designs.

Availability

HMC547LP3 is available at Aetrix Electronics and suitable for basestation infrastructure, fiber optics & broadband telecom, and microwave radio & VSAT applications requiring stable component supply, consistent RF performance across temperature, and long-term obsolescence management.

Supply support for HMC547LP3 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 continues to manufacture and support its high-frequency RF portfolio, including GaAs MMIC switches, amplifiers, and mixers for defense, communications, and instrumentation markets.

The HMC547LP3 belongs to Hittite's legacy GaAs MMIC SPDT switch product line, engineered specifically for broadband non-reflective RF signal routing in microwave infrastructure where high isolation, low loss, and control simplicity are critical.

FAQ

What is the operating temperature range for the HMC547LP3?

The HMC547LP3 is specified for continuous operation from -40 °C to +85 °C ambient temperature. Electrical parameters such as insertion loss, isolation, and return loss are guaranteed across this range at TA = +25 °C, with typical performance curves provided for +85 °C and -40 °C in the datasheet. Thermal resistance values (250 °C/W on terminated path) support reliable operation within this envelope when proper PCB grounding is implemented.

Does the HMC547LP3 require external bias components or DC blocking capacitors?

The HMC547LP3 requires no external bias supply - its complementary -5 V/0 V control logic operates without positive voltage rails. However, DC blocking capacitors are mandatory on RFC, RF1, and RF2 ports if the RF line DC potential differs from 0 V, as all three RF pins are DC-coupled and internally matched to 50 Ω. The datasheet specifies this requirement explicitly in the Pin Descriptions section.

How does the HMC547LP3 differ from the HMC547LP3E variant?

The HMC547LP3 and HMC547LP3E share identical RF specifications, pinout, and functional behavior. The sole differences are RoHS compliance (HMC547LP3E uses 100% matte Sn finish), peak reflow temperature (260 °C vs. 235 °C), and moisture sensitivity level (both MSL1). No electrical or mechanical redesign was performed - they are drop-in replacements for their respective assembly processes.

Can the HMC547LP3 be used in reflective (series-shunt) configurations?

No - the HMC547LP3 is strictly a non-reflective SPDT switch with internal 50 Ω terminations on unselected paths. It is not designed for series-shunt or reflective topologies. Attempting to use it in a reflective configuration would violate its internal architecture, degrade isolation, increase VSWR, and risk damage due to mismatched power dissipation. Its truth table and functional diagram confirm fixed non-reflective operation.

What is the maximum RF input power the HMC547LP3 can handle continuously?

The HMC547LP3 has an absolute maximum RF input power rating of +30 dBm (1 W) when control voltage is held at -5 V. For continuous operation under hot-switch conditions (i.e., switching while RF is applied), the limit is +23 dBm. These ratings assume proper thermal management via full-solder connection of the exposed paddle and all ground pins to a low-impedance PCB ground plane, as specified in the package outline drawing and thermal resistance data.