Analog Devices Inc. HMC306AMS10TR

Overview

HMC306AMS10 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC 5-bit digital attenuator in MSOP-10 package, operating from 0.7 to 3.8 GHz with 0.5 dB LSB steps, 15.5 dB max attenuation, ±0.2 dB typical bit error, and +52 dBm IIP3 at Vdd = 5V. It serves as a precision RF signal level controller in cellular infrastructure and microwave radio front-ends.

For engineers reviewing the HMC306AMS10 datasheet, HMC306AMS10 pinout, HMC306AMS10 application, or HMC306AMS10 equivalent, key selection criteria include broadband insertion loss flatness (1.3–2.3 dB), single-supply positive control logic (0/+3–5V), RoHS-compliant Sn/Pb lead finish, and MSOP-10 thermal resistance of 128.5 °C/W.

Technical Context

The HMC306AMS10 implements a monolithic GaAs MMIC architecture with five independent CMOS-compatible control inputs driving discrete attenuation bits (0.5, 1, 2, 4, 8 dB), enabling 32 linearly addressable states. Its RF path uses matched impedance topology for 50 Ω input/output and maintains return loss ≥10 dB across full band.

It operates with a single +3 to +5 V bias applied via external 5 kΩ resistor to Pin 6 or Pin 10, while each control pin toggles between 0 V and Vdd to select attenuation state. Switching speed is 560 ns rise/fall time and 600 ns ON/OFF delay, supporting dynamic RF level adjustment in real-time systems.

Key Specifications

Pinout & Package

Package: MSOP-10 (15 mm²), RoHS-compliant Sn/Pb finish, MSL1, thermal resistance 128.5 °C/W (channel-to-package bottom).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC306AMS10E and QM11036, the HMC306AMS10 offers optimal balance of compact MSOP-10 size, proven 0.7–3.8 GHz performance, and Sn/Pb process compatibility-making it preferred for cost-sensitive, space-constrained RF designs where RoHS exemption applies.

Availability

HMC306AMS10 is available at Aetrix Electronics and suitable for cellular infrastructure, microwave radio links, and wireless test equipment requiring stable component supply, long-term obsolescence planning, and traceable sourcing.

Supply support for HMC306AMS10 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 HMC306AMS10 belongs to Hittite's legacy GaAs MMIC digital attenuator family, engineered for broadband wireless infrastructure and instrumentation where precision, speed, and linearity are critical.

FAQ

What is the maximum RF input power the HMC306AMS10 can handle?

The HMC306AMS10 supports +27 dBm RF input power across 0.7–3.8 GHz at Vdd = 3V, and up to +28 dBm at Vdd = 5V. This is specified as the input power for 0.1 dB compression, meaning the device maintains linear operation below this level. Exceeding it risks gain compression and distortion. The HMC306AMS10's robust GaAs process and thermal design (128.5 °C/W) ensure reliable operation under sustained RF stress in base station and test equipment applications.

Does the HMC306AMS10 require external DC blocking capacitors?

Yes, the HMC306AMS10 requires external DC blocking capacitors on both RF1 and RF2 ports. The datasheet specifies 100–300 pF values depending on the lowest operating frequency-e.g., 300 pF for 0.7 GHz, 100 pF for 3.8 GHz-to minimize insertion loss while maintaining DC isolation. These capacitors are mandatory; omitting them risks bias disruption and potential damage. The HMC306AMS10 itself contains no internal DC blocking, as confirmed by its truth table and application circuit.

What is the recommended biasing method for the HMC306AMS10?

The HMC306AMS10 requires a single +3 to +5 V supply applied through an external 5 kΩ resistor to either Pin 6 (Vdd) or Pin 10 (Vdd). This resistor limits current and stabilizes bias under RF load. No additional decoupling is mandated, though 100 Ω resistors (R2–R6) may optionally enhance RF–control isolation. The HMC306AMS10 draws minimal quiescent current, and its bias network must connect directly to a clean, low-impedance ground plane per all GND pins (3,4,7,9).

Is the HMC306AMS10 pin-compatible with the HMC306AMS10E?

Yes, the HMC306AMS10 and HMC306AMS10E share identical pinout, electrical specifications, and MSOP-10 package dimensions. The only differences are RoHS compliance (matte Sn vs Sn/Pb finish) and MSL1 reflow profile (260 °C vs 235 °C peak). Therefore, the HMC306AMS10E is a direct replacement for HMC306AMS10 in new designs requiring lead-free assembly, with no PCB or schematic changes needed for the HMC306AMS10E.

What is the switching speed of the HMC306AMS10?

The HMC306AMS10 has tRISE/tFALL of 560 ns (10/90% RF) and tON/tOFF of 600 ns (50% CTL to 10/90% RF), measured across 0.7–3.8 GHz. These values reflect full-state transitions (e.g., 0 dB → 15.5 dB) and are consistent across temperature. The HMC306AMS10's GaAs MMIC architecture enables this speed without external drivers, making it suitable for real-time AGC loops and fast-hopping test systems where latency matters.