Analog Devices Inc. HMC290ETR

Overview

HMC290ETR from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC 2-bit digital attenuator in SOT-26 package, delivering 2 dB LSB and 4 dB MSB attenuation steps across 0.7–4.0 GHz with ±0.2 dB typical bit error, <0.7 dB typical insertion loss, and +52 dBm IIP3 at 5 V. It serves RF front-end gain control in cellular base stations and wireless infrastructure.

For engineers reviewing the HMC290ETR datasheet, HMC290ETR pinout, HMC290ETR application, or HMC290ETR equivalent, key selection criteria include broadband 2-bit attenuation accuracy, low DC power consumption (<50 µA per control line), SOT-26 footprint compatibility, and guaranteed operation from –40°C to +85°C.

Technical Context

The HMC290ETR implements a monolithic GaAs MMIC architecture with two independent CMOS-compatible control inputs (V1, V2) that toggle between 0 V and Vdd (+3 to +5 V) to select attenuation states (0, 2, 4, or 6 dB). Bias is applied via a single external 5 kΩ resistor to Vdd pin.

It operates without internal bias regulation, requiring external DC blocking capacitors (C1, C2 = 100–300 pF) on both RF ports and direct grounding of all package ground leads to a low-inductance RF ground plane. Switching speed is 400 ns (tRISE/tFALL) and 420 ns (tON/tOFF).

Key Specifications

Pinout & Package

SOT-26 plastic surface-mount package (9 mm² footprint), RoHS-compliant, matte tin lead finish, MSL1 rated (260°C peak reflow). All ground leads (Pins 2, 4, 5) must be soldered directly to PCB RF ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2-bit digital attenuator applications.

Compared with HMC290TR and QM11024, the HMC290ETR offers optimal balance of size (SOT-26), precision (±0.2 dB), and linearity (+52 dBm IIP3) for 0.7–4.0 GHz infrastructure applications where RoHS compliance and minimal board area are critical.

Availability

HMC290ETR is available at Aetrix Electronics and suitable for cellular base station transceivers, PCS/ISM wireless links, and WLL handset front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HMC290ETR 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 IC portfolio into ADI's broader signal chain solutions.

The HMC290ETR belongs to the Hittite legacy GaAs MMIC digital attenuator product line, engineered specifically for broadband wireless infrastructure demanding high accuracy, small size, and robust RF performance.

FAQ

What is the maximum RF input power rating for the HMC290ETR?

The HMC290ETR has an absolute maximum RF input power rating of +28 dBm across 0.7–4.0 GHz. Under normal operation, the 0.1 dB compression point is +27 dBm at 5 V supply and +24 dBm at 3 V supply - values confirmed in the datasheet's electrical specifications table and validated over temperature.

Does the HMC290ETR require external DC blocking capacitors?

Yes, the HMC290ETR requires external DC blocking capacitors on both RF1 and RF2 pins. The datasheet specifies C1 = C2 = 100–300 pF to pass the lowest operational frequency with minimal loss. These capacitors isolate DC bias from the RF signal path and are mandatory for proper function.

What is the recommended bias network for the HMC290ETR Vdd pin?

The HMC290ETR requires a single +3 to +5 V DC supply applied through an external 5 kΩ resistor to Pin 3 (Vdd). This resistor limits current and provides appropriate biasing for the internal GaAs core. No additional decoupling is specified, but local 100 nF ceramic capacitance near Vdd is recommended for noise suppression.

Can the HMC290ETR operate at 3.3 V logic levels for control inputs?

Yes, the HMC290ETR supports control voltages of 0 V (low) and Vdd (high), where Vdd may be set to 3.3 V. Its control inputs draw <50 µA each and tolerate Vdd ± 0.2 V, making it compatible with standard 3.3 V CMOS logic without level shifters or pull-up resistors.

Is the HMC290ETR pin-compatible with the HMC290TR?

Yes, the HMC290ETR and HMC290TR share identical SOT-26 pinout, package dimensions, and electrical functionality. The only differences are RoHS compliance (matte Sn vs. Sn/Pb), MSL rating (260°C vs. 235°C), and marking (290E vs. H290); no PCB redesign is needed for substitution within qualified reflow profiles.