Analog Devices Inc. HMC784MS8GETR

Overview

HMC784MS8GETR from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SPDT transmit/receive switch in MSOP-8G package, operating from DC to 4 GHz with +40 dBm input P1dB at +8 V, 0.4 dB typical insertion loss at DC–1.0 GHz, and +62 dBm IIP3 at +5 V - deployed in cellular infrastructure and test equipment for high-linearity RF path switching.

For engineers reviewing the HMC784MS8GETR datasheet, HMC784MS8GETR pinout, HMC784MS8GETR application, or HMC784MS8GETR equivalent, key selection criteria include its 10 W RF power handling, positive CMOS/TTL-compatible control (3–8 V), reflective OFF-state architecture, and thermal performance up to +85 °C in compact 14.8 mm² MSOP-8G.

Technical Context

The HMC784MS8GETR implements a monolithic GaAs pHEMT-based SPDT switch with integrated bias control circuitry enabling single-supply operation from +3 V to +8 V. Its reflective OFF-state design (RF1/RF2 present short circuits when inactive) minimizes external component count while maintaining >26 dB isolation across DC–4 GHz.

Switching is controlled via complementary logic inputs A and B with 15 ns rise/fall time and 40 ns propagation delay; on-chip thermal protection supports continuous operation at +85 °C with 53.4 °C/W channel-to-ground thermal resistance and 1.217 W max dissipation at T_C = 85 °C.

Key Specifications

Pinout & Package

Package: MSOP-8G (14.8 mm²), RoHS-compliant low-stress molded plastic with 100% matte Sn lead finish, MSL1 rating, and 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 SPDT T/R switch applications.

Compared with HMC784MS8GETR, HMC547LP3E extends frequency coverage but adds supply complexity, while QM11036 offers higher power at narrower voltage range - HMC784MS8GETR remains optimal for 4G infrastructure and test gear requiring 3–8 V logic flexibility and proven DC–4 GHz linearity.

Availability

HMC784MS8GETR is available at Aetrix Electronics and suitable for cellular infrastructure, WiMAX CPE, and RF test equipment requiring stable component supply, long-lifecycle support, and traceable GaAs MMIC sourcing.

Supply support for HMC784MS8GETR 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 maintains its high-frequency RF portfolio, specializing in GaAs, GaN, and SiGe MMICs for defense, communications, and instrumentation.

The HMC784MS8GETR belongs to Hittite's legacy high-power SPDT switch product line, engineered for broadband T/R applications demanding high linearity, thermal resilience, and logic-compatible control in compact surface-mount packages.

FAQ

What is the maximum RF input power the HMC784MS8GETR can handle?

The HMC784MS8GETR supports +40 dBm (10 W) input P1dB at +8 V supply, with absolute maximum RF input power rated at +39 dBm at +85 °C ambient. Derating applies above 85 °C per its 25 mW/°C thermal specification. This makes HMC784MS8GETR suitable for macrocell and repeater front-end switching where high-power handling is critical.

Does the HMC784MS8GETR require external DC blocking capacitors?

Yes - DC blocking capacitors are mandatory at RFC, RF1, and RF2 ports as specified in the datasheet. Their value determines the lowest usable frequency; for DC–4 GHz operation, typical values range from 100 pF to 1 nF depending on low-frequency cutoff requirements. The HMC784MS8GETR itself is DC-coupled internally but relies on external AC coupling for system-level DC isolation.

What logic families are compatible with the HMC784MS8GETR control inputs?

The HMC784MS8GETR accepts +3 V to +8 V positive control signals and is directly compatible with CMOS (HC series) and TTL (HCT series) logic families without level shifting. Input current is ≤0.5 μA in low state and ≤0.1 μA in high state, minimizing drive burden. This compatibility simplifies integration into existing FPGA-, MCU-, or ASIC-controlled RF subsystems using HMC784MS8GETR.

How does thermal performance impact HMC784MS8GETR reliability in sealed enclosures?

HMC784MS8GETR features 53.4 °C/W thermal resistance from channel to ground paddle and is rated for continuous operation up to +85 °C ambient. In sealed enclosures, proper PCB grounding of all GND pins and the exposed paddle is essential to maintain junction temperature below 150 °C. Thermal derating begins at 85 °C, reducing max dissipation by 25 mW/°C - a key design consideration for long-term reliability of HMC784MS8GETR in enclosed RF modules.

Is the HMC784MS8GETR pin-compatible with other Hittite SPDT switches like the HMC547LP3E?

No - HMC784MS8GETR uses an 8-lead MSOP-8G package with specific pinout (A/B/Vdd/GND/RFC/RF1/RF2), while HMC547LP3E uses a 16-lead QFN package with different pin assignment and dual-supply requirements. There is no pin-to-pin or drop-in replacement relationship; redesign of layout and biasing is required when substituting HMC784MS8GETR with HMC547LP3E or other family members.