Analog Devices Inc. 106058-HMC455LP3

Overview

HMC455LP3 from Analog Devices (formerly Hittite Microwave) is a GaAs InGaP HBT linear power amplifier IC designed as a driver stage in RF front-ends. It delivers 13 dB small-signal gain, +28 dBm saturated output power, and +42 dBm output IP3 across 1.7–2.5 GHz, operating from a single +5 Vdc supply with 56% PAE - ideal for PCS/3G base station driver applications.

For engineers reviewing the HMC455LP3 datasheet, HMC455LP3 pinout, HMC455LP3 application, or HMC455LP3 equivalent, key selection criteria include its high linearity (+42 dBm IP3), thermal performance via exposed paddle QFN, W-CDMA ACPR of –45 dBc at +19 dBm, and compatibility with 50 Ω RF system interfaces.

Technical Context

The HMC455LP3 employs an InGaP HBT process for high breakdown voltage and thermal stability, enabling robust operation over –40°C to +85°C. Its monolithic MMIC architecture integrates bias networks and matching elements, requiring only minimal external components (e.g., 8.2 nH RF choke, 2.2 µF bypass capacitor) for full functionality.

It operates as a fixed-gain, Class AB RF power amplifier with DC-coupled collector bias on Pin 10 (RFOUT) and AC-coupled input on Pin 3 (RFIN). Input/output return loss exceeds 10 dB across band, and reverse isolation (S12) remains >–25 dB, supporting stable multi-stage cascade designs without additional isolators.

Key Specifications

Pinout & Package

Package: 3×3 mm, 16-lead leadless QFN (LP3) with exposed thermal paddle; RoHS-compliant version HMC455LP3E uses matte Sn finish (MSL1, 260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with QPA2211 and SKY65167-374LF, the HMC455LP3 uniquely balances 1.7–2.5 GHz coverage, +42 dBm IP3, and minimal external component count - making it optimal for cost-sensitive, thermally constrained PCS/UMTS driver stages requiring proven linearity.

Availability

HMC455LP3 is available at Aetrix Electronics and suitable for wireless infrastructure, macrocell base stations, and RF test equipment requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for HMC455LP3 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 portfolio, including GaAs and GaN MMICs for communications and defense applications.

The HMC455LP3 belongs to Hittite's legacy linear amplifier product line, engineered specifically for high-linearity, high-efficiency driver stages in 3G/4G wireless infrastructure equipment.

FAQ

What is the recommended DC bias configuration for HMC455LP3?

The HMC455LP3 requires a single +5 Vdc supply applied to Pin 10 (RFOUT), which serves as both RF output and collector bias node. A parallel 2.2 µF tantalum capacitor (C1) and 100 pF ceramic capacitor (C5) must be placed close to Pin 10 for effective RF bypassing and low-impedance DC path. No separate gate/base bias is needed - the internal HBT bias network is self-setting.

Does HMC455LP3 require external matching components?

Yes, the HMC455LP3 requires external matching: Pin 3 (RFIN) needs an AC-coupling capacitor (e.g., 3.0 pF) and optional series/shunt elements depending on source impedance; Pin 10 (RFOUT) requires a bias feed inductor (e.g., 8.2 nH) and output matching to 50 Ω. The evaluation board (106058) provides validated values for 1.85–2.2 GHz tuning.

What is the thermal management requirement for HMC455LP3?

HMC455LP3 relies on its exposed thermal paddle for heat dissipation, with a junction-to-ground thermal resistance of 63 °C/W. To maintain Tj ≤ 125°C at full Psat, at least six 0.3 mm diameter thermal vias must connect the paddle to inner/outer ground planes, and the PCB should use ≥2 oz copper on ground layers. Forced air or heatsink attachment is recommended above 1 W dissipation.

Is HMC455LP3 suitable for W-CDMA modulated signals?

Yes, the HMC455LP3 is characterized for W-CDMA: it achieves –45 dBc adjacent channel power ratio (ACPR) at +19 dBm channel power with 64 DPCH loading at 2.14 GHz. This confirms its suitability for 3GPP-compliant UMTS base station drivers where spectral regrowth must meet stringent ACLR specifications.

What is the difference between HMC455LP3 and HMC455LP3E?

HMC455LP3 uses Sn/Pb lead finish (MSL1, 235°C peak reflow); HMC455LP3E is RoHS-compliant with 100% matte Sn finish (MSL1, 260°C peak reflow). Both share identical electrical specs, package dimensions, and pinout. The "E" suffix denotes environmental compliance - no performance or reliability trade-offs exist between the two variants.