Analog Devices Inc. 104124-HMC784MS8GE

Overview

HMC784MS8GE from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SPDT transmit/receive switch in an 8-lead MSOPG package, designed for DC–4 GHz RF signal routing in high-power infrastructure transceivers. It delivers +40 dBm input P1dB at +8 V, 0.4 dB insertion loss at DC–1 GHz, and +62 dBm third-order intercept, enabling robust operation in cellular base station front-ends and test equipment.

For engineers reviewing the HMC784MS8GE datasheet, HMC784MS8GE pinout, HMC784MS8GE application, or HMC784MS8GE 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 with 53.4 °C/W channel-to-ground thermal resistance.

Technical Context

The HMC784MS8GE 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 tRISE/tFALL of 15 ns and tON/tOFF of 40 ns. On-chip thermal protection supports continuous dissipation of 1.217 W at +85 °C, derating linearly above that temperature.

Key Specifications

Pinout & Package

Package: MSOP8G (14.8 mm²), RoHS-compliant low-stress plastic with copper alloy leadframe and 100% matte tin finish; MSL1 rated; thermal paddle must be soldered to PCB RF ground.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SPDT high-power RF switch applications.

Compared with HMC784MS8GE, HMC547LP3E trades 6 dB P1dB headroom for smaller size and wider bandwidth, while QM11036 offers higher integration but demands more complex biasing and layout-neither is pin-compatible, and both require board redesign.

Availability

HMC784MS8GE is available at Aetrix Electronics and suitable for cellular infrastructure, fixed wireless terminals, and RF test equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for HMC784MS8GE 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 MMIC solutions for defense, communications, and instrumentation markets.

The HMC784MS8GE belongs to Hittite's legacy high-power SPDT switch product line, engineered specifically for DC–4 GHz T/R applications demanding high linearity, thermal resilience, and simplified bias architecture in macrocell and test-system designs.

FAQ

What is the maximum RF input power the HMC784MS8GE can handle continuously?

The HMC784MS8GE supports continuous RF input power up to +39 dBm (≈8 W) at +85 °C with +8 V supply and 50 Ω source/load impedances. Its absolute maximum rating is defined by thermal limits: 1.217 W dissipation at +85 °C, derating 25 mW/°C above that temperature. This makes the HMC784MS8GE suitable for macrocell base station T/R switching where sustained high-power operation is required.

Does the HMC784MS8GE require external DC blocking capacitors?

Yes, the HMC784MS8GE requires external DC blocking capacitors at all three RF ports (RFC, RF1, and RF2), as stated in the datasheet notes and truth table. These capacitors define the lowest usable frequency-typically 100 pF for operation down to ~20 MHz. The device itself is DC-coupled internally, so omission of these capacitors risks damage from DC voltage or bias feed-through in real-world RF circuits.

Can the HMC784MS8GE operate from a +3.3 V supply?

Yes, the HMC784MS8GE is fully specified for operation from +3 V to +8 V. At +3.3 V, it delivers +32 dBm input P0.1dB and +32 dBm P1dB across 0.1–4 GHz, with insertion loss increasing slightly (e.g., 0.6 dB typical at DC–1 GHz). Control inputs remain compatible with standard 3.3 V CMOS logic, making the HMC784MS8GE viable in mixed-voltage systems without level-shifting circuitry.

What is the thermal resistance of the HMC784MS8GE and how should it be managed on PCB?

The HMC784MS8GE has a channel-to-ground thermal resistance (θ_CH-GND) of 53.4 °C/W. To achieve rated performance, the exposed thermal paddle and pins 6 and 7 must be soldered directly to a low-impedance RF ground plane using multiple thermal vias. The datasheet mandates grounding the paddle-failure to do so results in excessive junction temperature rise and potential reliability degradation during high-power operation.

Is the HMC784MS8GE pin-compatible with other Hittite SPDT switches like the HMC783MS8GE?

No, the HMC784MS8GE is not pin-compatible with HMC783MS8GE or other members of the MSOP8G SPDT family. While both use the same MSOP8G package outline, their pin functions differ: HMC784MS8GE uses pins 1/A and 2/B for complementary control, whereas HMC783MS8GE employs a single-control architecture with different pin assignments. Board-level replacement requires schematic and layout revision-not drop-in substitution.