Analog Devices Inc. 109266-HMC550

Overview

109266-HMC550 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SPST failsafe RF switch in SOT26 package, operating from DC to 6 GHz with 0.7 dB typical insertion loss, +52 dBm IIP3, and 200 nA on-state current. It functions as a normally-on reflective switch for RF signal routing in battery-powered portable and automotive telematics systems.

For engineers reviewing the 109266-HMC550 datasheet, 109266-HMC550 pinout, 109266-HMC550 application, or 109266-HMC550 equivalent, key selection criteria include failsafe topology, Vdd compatibility (1.2–5 V), low-power CMOS/TTL control interface, and DC–6 GHz broadband performance without external biasing.

Technical Context

The 109266-HMC550 implements a monolithic GaAs MMIC architecture with integrated failsafe logic that defaults to low-loss RF path (RF1–RF2) when unpowered. Its reflective "Off" state eliminates need for termination resistors at RF ports.

Control is achieved via dual-voltage interface: Vctl relative to Vdd determines state, with defined thresholds (e.g., Vctl < 1.0 V = ON; Vctl > 2.9 V = OFF). It supports hot-switching up to +35 dBm and operates across –40°C to +85°C with MSL1 reflow rating.

Key Specifications

Pinout & Package

SOT26 plastic package (low-stress molded, Sn/Pb finish, MSL1); 6-pin surface-mount with exposed ground leads requiring direct PCB RF ground connection per datasheet note.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC550E and QM11036, the 109266-HMC550 uniquely combines failsafe "On" operation, 200 nA on-state current, and Sn/Pb-compatible SOT26 packaging - making it optimal for cost-sensitive, safety-critical, and battery-constrained RF switching where power loss resilience is mandatory.

Availability

109266-HMC550 is available at Aetrix Electronics and suitable for RFID readers, automotive telematics modules, and portable WLAN clients requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 109266-HMC550 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 product portfolio, specializing in GaAs, SiGe, and RF SOI solutions for communications, defense, and instrumentation.

The HMC550 series was designed specifically for low-power, failsafe RF switching in portable, automotive, and industrial wireless systems - emphasizing reliability under voltage interruption and minimal DC overhead.

FAQ

What is the failsafe behavior of the 109266-HMC550?

The 109266-HMC550 defaults to "On" (low insertion loss between RF1 and RF2) when unpowered or when Vctl is floating or below threshold. This failsafe behavior ensures RF continuity during power loss, MCU reset, or control signal dropout - a critical feature for automotive telematics and RFID systems where signal interruption must be avoided.

Does the 109266-HMC550 require external DC blocking capacitors?

Yes, the 109266-HMC550 requires external DC blocking capacitors at both RF1 and RF2 pins because its RF ports are DC-coupled. Capacitor value determines the low-frequency cutoff; for example, a 100 pF capacitor sets ~32 MHz minimum operating frequency. Omitting them risks DC shorting and damage to connected components.

What is the maximum RF input power the 109266-HMC550 can handle during hot switching?

The 109266-HMC550 supports hot switching up to +35 dBm RF input power while changing states - verified under Vctl = 0/+3.3 V conditions. This capability allows uninterrupted operation in test equipment and repeater applications where signal presence cannot be guaranteed during control transitions.

Can the 109266-HMC550 operate from a 1.8 V supply?

Yes, the 109266-HMC550 supports Vdd from 1.2 V to 5.0 V, including 1.8 V. At 1.8 V, it maintains functional switching with verified thresholds: Vctl < 1.0 V yields "On", and Vctl > 1.8 V yields "Off". Full RF performance (e.g., 0.7 dB IL, +52 dBm IIP3) is specified at 3.3 V but remains usable across the entire Vdd range.

Is the 109266-HMC550 pin-compatible with the HMC550E?

Yes, the 109266-HMC550 is pin-compatible with the HMC550E - both use identical SOT26 footprints, pin numbering, and electrical interface. The only differences are RoHS compliance (HMC550E uses 100% matte Sn; 109266-HMC550 uses Sn/Pb) and reflow profile (260 °C vs. 235 °C peak), making them drop-in replacements in compatible assembly processes.