Analog Devices Inc. HMC233G8

Overview

HMC233G8 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SPDT switch in a hermetic surface-mount package, operating from DC to 6 GHz. It delivers 1.5 dB typical insertion loss at 4 GHz, >44 dB isolation up to 2 GHz, and >31 dB isolation up to 6 GHz, with non-reflective design and -5/0 V complementary control logic-ideal for RF front-end path selection in microwave radios.

For engineers reviewing the HMC233G8 datasheet, HMC233G8 pinout, HMC233G8 application, or HMC233G8 equivalent, key selection criteria include its high isolation across 0.5–6 GHz, 22–27 dBm input P1dB, 46 dBm IIP3, sub-6 ns switching speed, and operation without external bias supply.

Technical Context

The HMC233G8 implements a GaAs MESFET-based non-reflective SPDT architecture with integrated termination paths, enabling simultaneous RF port match in both ON and OFF states. Its complementary negative logic control (A/B pins at -5 V / 0 V) eliminates need for level-shifting circuitry.

Thermal design relies on dual thermal resistance paths: 148 °C/W through the insertion-loss path and 260 °C/W through terminated paths. The device supports hot-switching up to +27 dBm and operates across -40 °C to +85 °C with Class 1A ESD rating.

Key Specifications

Pinout & Package

Package: Hermetic 8-lead surface-mount package (alumina-loaded borosilicate glass body, Kovar leads and cover, 50 µin gold plating over nickel). Dimensions: 0.150 × 0.150 × 0.055 inches (3.81 × 3.81 × 1.40 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC233G8, HMC547LP3E offers extended frequency coverage at the cost of control compatibility, while QM11036 provides simplified logistics and lower cost but sacrifices DC coupling and isolation margin-making HMC233G8 optimal for legacy military and space systems requiring hermetic reliability and true DC–6 GHz performance.

Availability

HMC233G8 is available at Aetrix Electronics and suitable for telecom infrastructure, microwave radio & VSAT, and military radio applications requiring stable component supply despite its obsolete status through controlled legacy sourcing.

Supply support for HMC233G8 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 legacy product support, quality assurance, and documentation for high-performance RF components.

The HMC233G8 belongs to Hittite's GaAs MMIC SPDT switch family, engineered for broadband, high-isolation RF path selection in mission-critical defense, aerospace, and instrumentation systems.

FAQ

What is the control voltage requirement for HMC233G8?

The HMC233G8 requires complementary negative logic control: A and B pins accept -5 V (logic high) and 0 V (logic low) with ≤45 µA typical current draw. The absolute maximum control voltage range is -7.5 V to +1.0 V DC. Exceeding these limits risks permanent damage to the GaAs MESFET gates.

Does HMC233G8 require an external bias supply?

No, the HMC233G8 operates without external bias-it derives all internal biasing from the -5 V / 0 V control voltages applied to pins A and B. This eliminates the need for separate VDD/VSS rails, simplifying PCB layout and reducing power supply complexity in compact RF modules.

Can HMC233G8 be used in DC-coupled applications?

Yes, all RF ports (RFC, RF1, RF2) are DC-coupled and matched to 50 Ω. However, external DC-blocking capacitors must be added if the connected RF line has non-zero DC potential-otherwise, unintended biasing or short circuits may occur across the switch's internal FET paths.

What is the thermal resistance of HMC233G8 under RF power dissipation?

HMC233G8 exhibits 148 °C/W thermal resistance through the insertion-loss path and 260 °C/W through the terminated path. At 85 °C case temperature, continuous power dissipation is limited to 0.25 W, derating by 4 mW/°C above that-critical for thermal design in sealed enclosures or high ambient environments.

Is HMC233G8 still in production or supported by Analog Devices?

HMC233G8 is marked OBSOLETE in official documentation, but Analog Devices continues to support it via controlled legacy distribution and technical documentation. Aetrix Electronics maintains verified stock and offers traceable, tested units with full datasheet compliance and application engineering support for ongoing production programs.