Analog Devices Inc. 103372-HMC290

Overview

HMC290 from Hittite Microwave Corporation is a GaAs MMIC 2-bit digital attenuator in SOT-26 package, delivering 2 dB (LSB) and 4 dB attenuation steps across 0.7–4.0 GHz with ±0.2 dB typical bit error, <0.7 dB insertion loss, and +52 dBm IIP3 at 5 V - used in RF front-ends of cellular base stations and PCS handsets.

For engineers reviewing the HMC290 datasheet, HMC290 pinout, HMC290 application, or HMC290 equivalent, key selection criteria include broadband attenuation accuracy, low control current (<50 µA per bit), SOT-26 footprint compatibility, and DC-coupled positive logic interface for 0/+3–5 V control.

Technical Context

The HMC290 implements a monolithic GaAs MMIC architecture with two independent CMOS-compatible control inputs (V1, V2) selecting discrete attenuation states via integrated FET switching networks. It operates without external biasing components beyond a single 5 kΩ series resistor to Vdd.

All attenuation states maintain matched 50 Ω RF path impedance across 0.7–4.0 GHz, with return loss ≥15 dB (RF1/RF2) and phase tracking within ±3° over frequency - enabling stable gain control in wideband transceivers and repeater systems.

Key Specifications

Pinout & Package

SOT-26 plastic package (9 mm² footprint), RoHS-compliant variant available as HMC290E; leadframe material: copper alloy; MSL1 rating; marking "H290".

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital attenuator applications.

Compared with HMC290E and QM11036, the HMC290 offers the smallest footprint (SOT-26) and lowest control current for 2-bit applications in 0.7–4.0 GHz systems, making it optimal for space-constrained, battery-sensitive, or cost-driven RF modules where 2 dB resolution suffices.

Availability

HMC290 is available at Aetrix Electronics and suitable for cellular infrastructure, PCS handset design, and MMDS subscriber unit development requiring stable component supply and long-term production continuity.

Supply support for HMC290 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, acquired by Analog Devices in 2014, specialized in high-performance RFICs, MMICs, and microwave components for defense, wireless infrastructure, and test equipment.

The HMC290 belongs to Hittite's broadband digital attenuator product line, engineered for compact, low-power, high-accuracy RF gain control in commercial wireless transceivers and repeaters.

FAQ

What is the maximum RF input power the HMC290 can handle without compression?

The HMC290 supports +27 dBm input power for 0.1 dB compression at 5 V supply and +24 dBm at 3 V, across its full 0.7–4.0 GHz operating band. This allows integration into medium-power transmit chains without external limiting, provided thermal dissipation is managed via proper PCB grounding per the datasheet layout guidelines. The HMC290 maintains specified performance up to these levels without permanent degradation.

Does the HMC290 require external DC blocking capacitors on its RF ports?

Yes, the HMC290 requires external DC blocking capacitors (C1 and C2) on both RF1 and RF2 ports, as specified in the application circuit. Typical values range from 100–300 pF depending on the lowest operating frequency; for example, 220 pF supports operation down to ~0.7 GHz with minimal insertion loss. These capacitors isolate DC bias from the RF path and prevent damage to connected components.

What is the recommended bias network for the HMC290 Vdd pin?

The HMC290 requires a single 5 kΩ resistor in series between the +3 to +5 V supply and Pin 3 (Vdd) to limit current and stabilize internal biasing. This resistor is mandatory and must be placed close to the device. No additional decoupling capacitors are required on Vdd, though optional 100 Ω resistors (R2/R3) may be added between control pins and ground to improve RF isolation per the evaluation board schematic.

How does the HMC290 achieve ±0.2 dB bit accuracy across temperature?

The HMC290 achieves ±0.2 dB typical bit error across −40°C to +85°C through monolithic GaAs MMIC process matching and on-chip temperature-compensated FET sizing. Its architecture minimizes process variation impact on attenuation step consistency, and the datasheet confirms this accuracy holds across voltage (3–5 V) and temperature extremes without external calibration. This makes the HMC290 suitable for uncalibrated production systems.

Is the HMC290 pin-compatible with the HMC290E variant?

Yes, the HMC290 and HMC290E share identical pinout, package dimensions, and electrical specifications; the only differences are RoHS compliance (matte Sn finish), MSL1 reflow profile (260 °C peak), and top-side marking ("290E"). No PCB redesign is needed when migrating from HMC290 to HMC290E, and both operate identically in-circuit. The HMC290E is a direct drop-in replacement for lead-free manufacturing.