Analog Devices Inc. 103397-HMC307QS16G

Overview

HMC307QS16G from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC 5-bit digital attenuator IC with 1 dB LSB steps, DC–4 GHz bandwidth, ±0.5 dB typical bit error, 31 dB max attenuation, and QSOP-16 package. It serves as a precision RF signal level controller in wireless transceivers requiring stable, low-distortion attenuation under -5 V bias.

For engineers reviewing the HMC307QS16G datasheet, HMC307QS16G pinout, HMC307QS16G application, or HMC307QS16G equivalent, key selection criteria include insertion loss (<2.7 dB up to 4 GHz), IIP3 (+44 dBm), switching speed (140 ns rise), control voltage compatibility (0/–5 V), and DC-coupled operation enabled by single negative supply.

Technical Context

The HMC307QS16G implements a monolithic GaAs MMIC architecture with five independent bit-controlled FET-based attenuation cells, each toggled via dedicated 0/–5 V logic inputs. Its grounded-base QSOP-16 layout minimizes parasitic inductance for broadband RF performance.

It operates with a single –5 V Vee bias (±10%), draws ≤6 mA total supply current, and supports DC-coupled RF paths via external blocking capacitors. Control inputs draw <50 µA per bit, enabling direct interface with standard CMOS/TTL drivers without level-shifting.

Key Specifications

Pinout & Package

Package: QSOP-16, 29.4 mm² footprint, exposed paddle requiring solder connection to PCB RF ground per MSL1 handling requirements. Lead finish: Sn/Pb.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC235QS16G and HMC624LP4E, the HMC307QS16G delivers optimal balance of bandwidth (DC–4 GHz), linearity (+44 dBm IIP3), and single-supply simplicity (–5 V only), making it preferred for cost-sensitive, high-volume wireless infrastructure where 1 dB resolution suffices.

Availability

HMC307QS16G is available at Aetrix Electronics and suitable for cellular base stations, wireless local loop equipment, and PCS/ISM repeaters requiring stable component supply and long-term obsolescence mitigation support.

Supply support for HMC307QS16G 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 ADI's broader signal chain solutions, emphasizing performance, reliability, and system-level integration.

The HMC307QS16G belongs to Hittite's legacy GaAs MMIC digital attenuator product line, designed specifically for broadband wireless infrastructure demanding low distortion, fast switching, and DC-coupled RF control in compact surface-mount form.

FAQ

What is the operating frequency range of the HMC307QS16G?

The HMC307QS16G operates from DC to 4 GHz, covering all major cellular (700–2700 MHz), PCS (1850–1990 MHz), ISM (2400–2483.5 MHz), and MMDS (2500–2700 MHz) bands. Its broadband response eliminates band-specific part variants, and insertion loss remains below 2.7 dB across the full range, verified at +25 °C with –5 V bias.

Does the HMC307QS16G require AC coupling on RF ports?

Yes - the HMC307QS16G requires external DC-blocking capacitors (C1 and C2) on both RF1 and RF2 ports. Recommended values range from 100 pF to 0.1 µF depending on the lowest operating frequency; for DC-coupled applications, use the minimum capacitance that passes the target band with <0.1 dB loss.

What is the control voltage logic scheme for the HMC307QS16G?

The HMC307QS16G uses negative logic: each bit control input (V1–V5) toggles between 0 V (logic low, no attenuation) and –5 V (logic high, bit active). With Vee = –5 V ±10%, low-state current is <70 µA and high-state current is <5 µA, enabling direct interface with standard logic drivers without level shifters.

Is the HMC307QS16G still in production or obsolete?

The HMC307QS16G is marked OBSOLETE in official documentation, but Aetrix Electronics maintains active inventory and offers lifecycle support including cross-reference guidance, last-time-buy planning, and qualified replacements. Full datasheet compliance and traceable lot history are provided for legacy program continuity.

How does the HMC307QS16G achieve DC-coupled operation?

The HMC307QS16G achieves true DC-coupled RF operation through its GaAs MMIC architecture and single –5 V Vee bias, which establishes proper FET operating points down to 0 Hz. External DC-blocking caps are still required on RF ports unless explicitly removed per application circuit validation - the DC coupling capability refers to internal core functionality, not unconditional port usage.