Analog Devices Inc. 106043-HMC457QS16G

Overview

HMC457QS16G from Analog Devices (formerly Hittite Microwave) is a GaAs InGaP HBT monolithic microwave integrated circuit (MMIC) power amplifier optimized for 1.7–2.2 GHz cellular infrastructure applications. It delivers 29 dBm P1dB, 27 dB gain at 1900 MHz, and +45 dBm output IP3 with 48% PAE at +32 dBm output, operating from a single +5 V supply. Its integrated Vpd power control enables RF output power and bias current adjustment in W-CDMA base station driver stages.

For engineers reviewing the HMC457QS16G datasheet, HMC457QS16G pinout, HMC457QS16G application, or HMC457QS16G equivalent, key selection criteria include its 16-pin QSOP package footprint, temperature-stable gain (±0.035 dB/°C), broadband input/output return loss (>8 dB), and suitability for CDMA/W-CDMA repeater and small-cell PA driver designs requiring high linearity and thermal robustness.

Technical Context

The HMC457QS16G employs a two-stage InGaP HBT MMIC architecture with separate bias networks for input and output stages. Its Vpd control pin directly modulates collector quiescent current (Icq = 400–620 mA across 4.5–5.5 V), enabling dynamic power-down and linear output power scaling without external bias circuitry.

It operates within –40°C to +85°C ambient, with thermal resistance of 23.3°C/W (junction-to-paddle) and absolute max Vcc = +6 Vdc. The device requires external 50 Ω matching on RFIN (Pin 6) and RFOUT (Pins 10–15), with all ground pins (2,4,5,7,9,16) and exposed paddle soldered to PCB RF ground via multiple vias.

Key Specifications

Pinout & Package

Package: QSOP16G - 16-lead plastic surface-mount package with exposed ground paddle (29.4 mm² footprint); MSL1 rated; Sn/Pb lead finish; max reflow 235°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RF power amplifier applications.

Compared with QPA9121 and SKY66312-364, the HMC457QS16G uniquely combines 1.7–2.2 GHz dual-band coverage, Vpd-based power control, +45 dBm OIP3, and QSOP thermal performance-making it specifically suited for thermally constrained, linearity-critical infrastructure driver stages where bias flexibility and proven field reliability are mandatory.

Availability

HMC457QS16G is available at Aetrix Electronics and suitable for cellular infrastructure, wireless repeater, and small-cell radio applications requiring stable component supply, long-lifecycle support, and consistent RF performance across temperature.

Supply support for HMC457QS16G 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, including GaAs and GaN MMICs for defense, communications, and test equipment.

The HMC457QS16G belongs to Hittite's legacy linear & power amplifier family, engineered specifically for cellular base station driver and repeater transmitter applications demanding high linearity, thermal stability, and compact SMT integration.

FAQ

What is the recommended PCB layout practice for thermal management of the HMC457QS16G?

The HMC457QS16G requires soldering of all ground pins (2,4,5,7,9,16) and the exposed paddle to a solid RF ground plane using ≥6 thermal vias. Rogers 4350B substrate (10 mil, εr = 3.48) is recommended. Thermal resistance is 23.3°C/W junction-to-paddle, so a 25°C ambient rise above case temperature is typical under full 510 mA Icq operation. Avoid floating ground pads or insufficient via count to prevent thermal throttling.

Can the HMC457QS16G operate reliably at 2140 MHz for W-CDMA uplink with 64 DPCH modulation?

Yes - the HMC457QS16G is characterized at 2100–2170 MHz and delivers +25 dBm W-CDMA channel power at –50 dBc ACPR when biased at +5 V and tuned per the 2100 MHz application circuit (C9 = 2.7 pF). Its +45 dBm OIP3 and 5 dB noise figure ensure ACLR compliance and uplink sensitivity preservation in real-world deployment.

Does the HMC457QS16G require external matching components for 50 Ω operation?

Yes - the HMC457QS16G is not internally matched. RFIN (Pin 6) and RFOUT (Pins 10–15) require external 50 Ω microstrip matching: TL1 (20° electrical length) and C9 (3.9 pF @ 1900 MHz / 2.7 pF @ 2100 MHz) per the reference schematics. Input return loss is 11 dB and output is 8 dB, confirming need for external tuning to achieve optimal VSWR and gain flatness.

How does the Vpd pin function in the HMC457QS16G, and what voltage range is safe?

The Vpd pin controls collector quiescent current (Icq) from near-zero to 620 mA across 0–5.5 V. For full power, connect to +5 V; voltages above +5.4 Vdc exceed absolute maximum rating and risk permanent damage. Reducing Vpd to 3.3 V lowers Icq to ~300 mA, enabling partial power-down during TDD guard intervals while maintaining RF path integrity.

Is the HMC457QS16G RoHS-compliant, and what is its moisture sensitivity level?

The HMC457QS16G uses Sn/Pb lead finish and is not RoHS-compliant; its RoHS-compliant variant is HMC457QS16GE (100% matte Sn). Both variants carry MSL1 rating, permitting unlimited floor life and peak reflow up to 235°C (HMC457QS16G) or 260°C (HMC457QS16GE), per JEDEC J-STD-020.