Analog Devices Inc. HMC284MS8GE

Overview

HMC284MS8GE from Hittite Microwave Corporation is a non-reflective SPDT RF switch IC designed for signal path selection in DC–3.5 GHz systems, featuring 0.7 dB typical insertion loss at 3.5 GHz, >45 dB isolation at 2.0 GHz, and positive 0/+5 V control logic compatible with CMOS/TTL. It serves in cellular/PCS base station front-ends where low-loss, high-isolation antenna or filter switching is required.

For engineers reviewing the HMC284MS8GE datasheet, HMC284MS8GE pinout, HMC284MS8GE application, or HMC284MS8GE equivalent, key selection criteria include non-reflective OFF-state matching, thermal resistance of 140 °C/W (insertion path), MSL1 RoHS-compliant MSOP-8G package, and operation across –40 °C to +85 °C industrial temperature range.

Technical Context

This monolithic GaAs pHEMT switch uses on-chip positive-control circuitry enabling 0/+5 V logic compatibility with sub-25 µA control current per input. Its non-reflective architecture terminates both RF1 and RF2 ports in 50 Ω when deselected, eliminating need for external termination in T/R or diversity switching.

The device operates over DC–3.5 GHz with specified performance up to 3.5 GHz, including 10 dB return loss (OFF state) and 12 dB return loss (ON state) at 3.5 GHz. Switching speed is defined by 40 ns tRISE/tFALL and 60 ns tON/tOFF, supporting medium-speed reconfiguration in wireless infrastructure.

Key Specifications

Pinout & Package

Package: RoHS-compliant MSOP-8G (8-lead grounded base MSOP) with exposed paddle requiring solder connection to PCB RF ground; MSL1 rating; 100% matte Sn lead finish; thermal resistance 140 °C/W (insertion path).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC284MS8GE, HMC194MS8 trades non-reflective operation for marginally better loss, while QM11036 offers smaller size and higher temperature rating at reduced isolation-making HMC284MS8GE optimal for industrial wireless infrastructure demanding guaranteed 50 Ω OFF-state matching.

Availability

HMC284MS8GE is available at Aetrix Electronics and suitable for cellular/PCS base stations, 2.4 GHz ISM systems, and 3.5 GHz wireless local loop applications requiring stable component supply, long-term lifecycle support, and traceable RoHS-compliant sourcing.

Supply support for HMC284MS8GE 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

Hittite Microwave Corporation, now part of Analog Devices, specialized in high-performance RFICs and microwave components for wireless infrastructure, defense, and test equipment markets.

The HMC284MS8GE belongs to Hittite's non-reflective SPDT switch product line, engineered specifically for high-isolation, low-loss signal routing in multi-band base station and fixed wireless transceivers.

FAQ

What is the operating temperature range for the HMC284MS8GE?

The HMC284MS8GE is rated for operation from –40 °C to +85 °C, meeting industrial temperature requirements for outdoor wireless infrastructure equipment. This range is validated under DC–3.5 GHz RF operation with 0/+5 V control inputs and 50 Ω system impedance. Thermal resistance is specified as 140 °C/W for the insertion loss path, supporting reliable thermal management in sealed enclosures.

Does the HMC284MS8GE require external DC blocking capacitors?

Yes, the HMC284MS8GE requires external DC blocking capacitors at RFC, RF1, and RF2 ports, as stated in the application notes. These capacitors define the lowest usable frequency and prevent DC bias from interfering with connected components. Typical values are 100 pF in 0402 package, selected to maintain ≥50 Ω impedance down to the desired low-frequency limit.

How does the non-reflective design of the HMC284MS8GE benefit system-level RF performance?

The non-reflective design of the HMC284MS8GE internally terminates both RF1 and RF2 ports to 50 Ω when deselected, ensuring VSWR remains near 1:1 regardless of switch state. This eliminates reflected energy that could destabilize power amplifiers or degrade receiver noise figure-critical in cellular base station front-ends where HMC284MS8GE is deployed.

Can the HMC284MS8GE be driven directly by standard CMOS logic?

Yes, the HMC284MS8GE accepts 0/+5 V control inputs and draws ≤25 µA per control pin, making it directly compatible with HC-series CMOS logic operating at Vdd = +5 V. No level-shifting or buffering is needed, simplifying interface design in digital-controlled RF subsystems using the HMC284MS8GE.

What is the absolute maximum RF input power rating for the HMC284MS8GE?

The absolute maximum RF input power for the HMC284MS8GE is +26 dBm, as specified in the Absolute Maximum Ratings table. However, continuous operation above +18 dBm (hot switch power level) is not recommended. For linear operation, the input P1dB is 18 dBm at 0.5–3.5 GHz, defining the practical upper limit for distortion-free signal handling in the HMC284MS8GE.