Analog Devices Inc. 110171-HMC457QS16G

Overview

HMC457QS16G from Analog Devices (formerly Hittite Microwave) is a GaAs InGaP HBT monolithic microwave integrated circuit (MMIC) power amplifier designed for RF front-end stages in cellular infrastructure. It delivers 1 W saturated output power (32 dBm), 27 dB gain at 1900 MHz, and +45 dBm output IP3 across 1.7–2.2 GHz, operating from a +5 V supply with 500 mA quiescent current. It serves as a high-linearity driver or final-stage PA in W-CDMA and LTE base station repeaters.

For engineers reviewing the HMC457QS16G datasheet, HMC457QS16G pinout, HMC457QS16G application, or HMC457QS16G equivalent, key selection criteria include its 1.7–2.2 GHz bandwidth, integrated Vpd power control, QSOP16G package thermal performance (23.3 °C/W), and verified +25 dBm W-CDMA channel power at –50 dBc ACPR - critical for 3G/4G macrocell and small-cell linear amplification.

Technical Context

The HMC457QS16G employs a two-stage InGaP HBT MMIC architecture with DC-coupled biasing and on-chip matching networks optimized for 1.7–2.2 GHz operation. Its input and output are internally matched to 50 Ω, enabling minimal external components - typically only bypass capacitors and a single series inductor per band.

Power control is implemented via the Vpd pin, which adjusts collector quiescent current (Icq) from 400 mA to 620 mA as Vs varies from 4.5 V to 5.5 V, enabling dynamic PAE optimization and full RF shutdown. Thermal management relies on the exposed ground paddle soldered directly to PCB RF ground with multiple vias, leveraging a junction-to-paddle thermal resistance of 23.3 °C/W.

Key Specifications

Pinout & Package

Package: QSOP16G - 16-lead plastic surface-mount package with exposed ground paddle (29.4 mm² footprint); RoHS-compliant version is HMC457QS16GE. MSL1 rating with peak reflow up to 235 °C (Sn/Pb) or 260 °C (matte Sn).

Key Features

Applications

Equivalent & Alternatives

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

Compared with QPA2211 and HMC458ST89, the HMC457QS16G uniquely combines 1.7–2.2 GHz coverage, integrated Vpd control, and 1 W output in a thermally robust QSOP package - making it the optimal choice for thermally constrained, dual-band 3G/4G repeaters and small cells requiring dynamic power management.

Availability

HMC457QS16G is available at Aetrix Electronics and suitable for cellular infrastructure, wireless repeaters, and small-cell radio head designs requiring stable component supply, long-lifecycle availability, 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 integrates its high-frequency RF portfolio into mission-critical communications solutions. The company specializes in precision analog, RF, and mixed-signal ICs for defense, aerospace, and telecom infrastructure.

The HMC457QS16G belongs to Analog Devices' legacy Hittite MMIC amplifier family, engineered specifically for high-linearity, high-efficiency cellular base station and repeater applications in the 1.7–2.2 GHz band.

FAQ

What is the maximum RF input power rating for the HMC457QS16G?

The absolute maximum RF input power for the HMC457QS16G is +15 dBm when Vs and Vpd are both at +5 Vdc. Exceeding this level risks permanent damage to the InGaP HBT transistor structure. For reliable operation, input drive should be limited to ≤+10 dBm to maintain linearity and avoid compression-induced distortion in W-CDMA or LTE signals. Always verify input matching and filtering in the application circuit before applying RF power to the HMC457QS16G.

Does the HMC457QS16G require external matching components for 1900 MHz operation?

Yes - although the HMC457QS16G features internal 50 Ω input/output matching, the recommended 1900 MHz application circuit uses discrete components including C1–C4 (100 pF), C5/C6 (1000 pF), L1/L2 (3.9 nH), and R1 (160 Ω) to optimize gain flatness, return loss, and harmonic suppression. These values are validated in the datasheet's 1900 MHz reference design (PCB 106043-1900) and must be implemented for production-grade performance. Skipping them degrades S11/S22 below specification.

Can the HMC457QS16G operate at 2.14 GHz for W-CDMA uplink with –45 dBc ACLR?

Yes - the HMC457QS16G delivers +25 dBm W-CDMA channel power at –45 dBc ACLR when operated at 2140 MHz with +5 V supply and optimized bias (Vpd = +5 V). This is confirmed in the datasheet's ACPR vs. supply voltage plot for 2140 MHz (page 11-244), where –45 dBc is achieved at +25 dBm output. Performance meets 3GPP TS 25.104 requirements for base station Class 3 power amplifiers.

What is the thermal resistance (θ_JA) of the HMC457QS16G in a typical 4-layer PCB layout?

The datasheet specifies junction-to-ground-paddle thermal resistance (θ_JP) as 23.3 °C/W, but does not publish θ_JA (junction-to-ambient) because it depends entirely on PCB layout. With ≥8 thermal vias under the exposed paddle, 2 oz copper ground planes, and no heatsink, measured θ_JA is ~55–65 °C/W. For continuous 1 W operation at +85 °C ambient, ensure board-level thermal design achieves ≤35 °C/W θ_JA - otherwise derate output power per the 42.9 mW/°C derating curve above 85 °C.

Is the HMC457QS16G pin-compatible with the HMC457QS16GE variant?

Yes - the HMC457QS16G and HMC457QS16GE share identical pinout, electrical specifications, and mechanical outline. The only differences are RoHS compliance (matte Sn finish vs. Sn/Pb), MSL1 reflow profile (260 °C peak vs. 235 °C), and package marking (H457XXXX). Both variants mount identically on PCB and function interchangeably in all circuits; the HMC457QS16GE is the recommended option for new designs requiring lead-free assembly.