Analog Devices Inc. HMC232

Overview

HMC232 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SPDT non-reflective switch die operating from DC to 15 GHz, delivering 1.4 dB insertion loss at 6 GHz, >50 dB isolation at 10 GHz, and requiring dual -5/0 V negative logic control. It serves as a broadband RF signal path selector in microwave transceivers and test instrumentation.

For engineers reviewing the HMC232 datasheet, HMC232 pinout, HMC232 application, or HMC232 equivalent, key selection criteria include its non-reflective architecture, 2.05 × 1.04 mm die size, -55 °C to +85 °C operating temperature range, and compatibility with 50 Ω microstrip layouts using 1-mil gold wire bonds.

Technical Context

The HMC232 implements on-chip via hole structures to achieve broadband non-reflective behavior across DC–15 GHz, enabling simultaneous high isolation (>45 dB up to 15 GHz) and low return loss (≥12 dB in "On" state to 15 GHz). Its MESFET-based design eliminates need for external Vee bias.

Control is implemented via two independent negative-voltage logic lines (A and B), each accepting -5 V (active) / 0 V (inactive), with alternate pad sets provided for flexible MIC layout. Switching speed is characterized by 3 ns tRISE/tFALL and 5 ns tON/tOFF across full frequency band.

Key Specifications

Pinout & Package

Package: Bare die, 2.05 × 1.04 × 0.1 mm (0.004″ thick), backside metallized for RF ground connection, gold bond pads (0.004″ square), no unlabeled pad connections required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC132 and QM11036, the HMC232 provides superior wideband isolation and linearity within its native DC–15 GHz range, while maintaining direct form-fit-function compatibility with legacy HMC132 layouts-making it optimal for military, test, and fiber-optic upgrades demanding GaAs-level RF fidelity.

Availability

HMC232 is available at Aetrix Electronics and suitable for fiber optic transceivers, microwave radio equipment, and automated test instrumentation requiring stable component supply across extended temperature ranges and high-frequency performance.

Supply support for HMC232 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 integrates its high-frequency RF portfolio into precision analog and RF solutions for defense, communications, and instrumentation markets.

The HMC232 belongs to Hittite's GaAs MMIC SPDT switch product line, engineered for broadband non-reflective signal routing in mission-critical RF systems where wideband isolation, fast switching, and rugged thermal performance are essential.

FAQ

What is the recommended control voltage configuration for the HMC232?

The HMC232 requires two negative logic control lines: A and B. Apply -5 V to the active control line and 0 V to the inactive line (e.g., A = -5 V, B = 0 V selects RFC→RF1). The absolute maximum control voltage range is +1 V to -7.5 Vdc, and bias current is ≤45 µA per line at -5 V. Do not exceed +26 dBm RF input during hot switching to avoid damage.

Does the HMC232 require an external Vee supply?

No, the HMC232 does not require an external Vee supply. It operates solely from the two -5/0 V control lines (A and B) and has no separate negative bias rail. This simplifies power delivery in compact RF modules and eliminates need for additional charge pumps or negative regulators in the signal path.

How is the HMC232 mounted and grounded for optimal RF performance?

The HMC232 die must be eutectically or conductively bonded (e.g., AuSn preform or conductive epoxy) directly to an RF ground plane. Its backside is metallized and serves as the primary RF ground reference. Bond wires should be ≤0.31 mm (12 mils) long using 0.025 mm (1 mil) gold wire, and microstrip substrates should be positioned ≤0.076 mm (3 mils) from the die surface to minimize parasitic inductance.

What is the significance of the "non-reflective" design in the HMC232?

The non-reflective design ensures that both RF1 and RF2 ports present a matched 50 Ω impedance whether the switch is in the ON or OFF state. This eliminates reflections that cause standing waves, gain ripple, or distortion in cascaded RF stages-enabling stable performance in sensitive receiver chains and broadband test setups without external termination networks.

Is the HMC232 still in production, and what is its lifecycle status?

The HMC232 is marked OBSOLETE in official documentation from Analog Devices. However, Aetrix Electronics maintains legacy inventory and offers traceable, tested units for continued support in existing designs. Customers should consult Aetrix for current stock levels, last-time-buy options, and migration guidance to functionally aligned alternatives such as the HMC132 or newer GaAs SPDT offerings.