Analog Devices Inc. 107749-HMC454ST89

Overview

HMC454ST89 from Analog Devices (formerly Hittite Microwave) is a GaAs InGaP HBT linear RF power amplifier optimized for driver-stage operation in 0.4–2.5 GHz wireless infrastructure. It delivers 12.5 dB gain at 2150 MHz, +42 dBm output IP3 at 2.0 GHz, and 50% PAE at +28 dBm Pout under +5 V single-supply operation-enabling high-linearity signal boosting in W-CDMA base station transmit chains.

For engineers reviewing the HMC454ST89 datasheet, HMC454ST89 pinout, HMC454ST89 application, or HMC454ST89 equivalent, this page provides verified specifications, SOT89 package layout guidance, temperature-stable RF performance data across 824–2200 MHz bands, and validated alternatives for cellular/PCS/3G/WLL system design.

Technical Context

The HMC454ST89 integrates a two-stage InGaP HBT MMIC with on-die biasing and internal matching networks optimized for broadband operation. Its input and output are AC-coupled, requiring external off-chip matching components (e.g., 1 nH/36 nH inductors, 8–22 pF capacitors) to achieve specified gain, return loss, and IP3 across discrete frequency bands.

It operates over –40°C to +85°C with thermal resistance of 73°C/W (junction-to-ground paddle), supporting stable RF performance in thermally constrained PCB layouts. Gain variation is ≤0.016 dB/°C, and output IP3 remains ≥+38 dBm across temperature at 1960 MHz and 900 MHz bands.

Key Specifications

Pinout & Package

Package: Industry-standard SOT-89 plastic package with exposed ground paddle; RoHS-compliant variant HMC454ST89E uses 100% matte Sn lead 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 PSA-2201+, the HMC454ST89 uniquely balances +5 V simplicity, +42 dBm IP3, and SOT-89 manufacturability-making it the preferred driver amplifier for production-grade 3G/W-CDMA infrastructure where thermal efficiency and linearity coexist under tight space constraints.

Availability

HMC454ST89 is available at Aetrix Electronics and suitable for W-CDMA base station drivers, PCS band power amplifier stages, and fixed wireless access CPE requiring stable component supply, consistent RF performance, and long-term industrial availability.

Supply support for HMC454ST89 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-performance RF product lines, including GaAs and GaN MMICs for wireless infrastructure, defense, and test equipment.

The HMC454ST89 belongs to Hittite's legacy InGaP HBT amplifier family, designed specifically for high-linearity, medium-power driver applications in cellular base stations and point-to-point radio systems.

FAQ

What is the maximum RF input power rating for the HMC454ST89?

The HMC454ST89 has an absolute maximum RF input power rating of +25 dBm at Vs = +5 Vdc. Exceeding this level risks permanent damage to the InGaP HBT transistor. For reliable operation, input power should remain ≤0 dBm per tone in two-tone testing and ≤–5 dBm in broadband modulated signal applications to maintain linearity and avoid compression-induced distortion in the HMC454ST89.

Does the HMC454ST89 require external bias sequencing or startup circuitry?

No, the HMC454ST89 operates from a single +5 V DC supply with no external bias sequencing required. Its internal bias network stabilizes quiescent current (Icq = 150–175 mA) across temperature. The RFOUT pin serves as both RF output and DC bias input, eliminating separate Vbias pins-simplifying layout and reducing component count in the HMC454ST89 application circuit.

Can the HMC454ST89 be used outside its specified 0.4–2.5 GHz range?

While the HMC454ST89 exhibits measurable gain down to 400 MHz and up to 2.5 GHz, performance degrades outside the validated bands (824–960 MHz, 1800–2000 MHz, 2000–2200 MHz). Below 400 MHz, gain drops sharply and input return loss worsens; above 2.5 GHz, output power and IP3 fall significantly. Use within the datasheet-specified bands ensures guaranteed HMC454ST89 performance.

How does the thermal design of the HMC454ST89 impact PCB layout?

The HMC454ST89 has a junction-to-ground paddle thermal resistance of 73°C/W, requiring direct soldering of pins 2 and 4 plus the exposed paddle to a large, multi-via ground plane. Insufficient copper area or inadequate via count raises junction temperature, degrading gain flatness and accelerating long-term drift. Proper thermal design ensures the HMC454ST89 maintains specified +42 dBm IP3 and 50% PAE across –40°C to +85°C ambient.

Is the HMC454ST89 pin-compatible with the HMC454ST89E variant?

Yes, the HMC454ST89 and HMC454ST89E share identical pinout, footprint, and electrical specifications. The only differences are RoHS compliance (100% matte Sn vs. Sn/Pb), MSL rating (both MSL1), and peak reflow temperature (260°C vs. 235°C). No PCB layout changes are needed when substituting HMC454ST89E for HMC454ST89-both deliver identical RF performance in the HMC454ST89 application circuits.