Analog Devices Inc. 108718-HMC453ST89

Overview

HMC453ST89 from Analog Devices (formerly Hittite Microwave) is a GaAs InGaP HBT monolithic microwave integrated circuit (MMIC) power amplifier optimized for 0.4–2.2 GHz broadband operation in cellular, PCS, and fixed wireless infrastructure. It delivers +32.5 dBm saturated output power, 20.5 dB gain at 400 MHz, +49 dBm output IP3 at 2.1 GHz, 41% power-added efficiency, and operates from a single +5 V supply with 725 mA quiescent current.

For engineers reviewing the HMC453ST89 datasheet, HMC453ST89 pinout, HMC453ST89 application, or HMC453ST89 equivalent, key selection criteria include its SOT-89 package compatibility, high linearity in W-CDMA/CDMA2000 bands, thermal resistance of 17.1 °C/W, and validated performance across -40°C to +85°C operating temperature range.

Technical Context

The HMC453ST89 employs a two-stage InGaP HBT MMIC architecture with on-die biasing and DC-coupled RF input. Its gain and linearity are stabilized across frequency via external matching networks-optimized per band (e.g., 400 MHz, 900 MHz, 1900 MHz, 2100 MHz)-and it requires no external bias sequencing. The device integrates no internal feedback or envelope tracking, relying instead on fixed +5 V DC bias applied directly to the RFOUT pin.

Thermal management is critical: the exposed paddle must be soldered to PCB ground, and junction-to-ground thermal resistance is specified at 17.1 °C/W. Absolute maximum ratings include +6 V collector bias, +32 dBm RF input, and 150 °C junction temperature-enabling robust operation under high-power transient conditions in base station front-end stages.

Key Specifications

Pinout & Package

The HMC453ST89 is housed in an industry-standard SOT-89 surface-mount package with exposed thermal paddle. Pin 1 is RFIN (RF input), Pin 2 and Pin 4 are GND (RF/DC ground), and Pin 3 is RFOUT (RF output and DC bias input). All ground pins and the exposed paddle must be soldered to a solid RF ground plane for optimal thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with QPA2211 and SKY65167-360LF, the HMC453ST89 uniquely balances full 0.4–2.2 GHz coverage, +5 V simplicity, and proven W-CDMA linearity-making it the preferred choice for multi-band legacy infrastructure upgrades without board rework.

Availability

HMC453ST89 is available at Aetrix Electronics and suitable for cellular infrastructure, fixed wireless access, and CDMA2000 repeater systems requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for HMC453ST89 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 communications and defense applications.

The HMC453ST89 belongs to Hittite's legacy InGaP HBT power amplifier family, designed specifically for high-efficiency, high-linearity operation in multi-band cellular base station and fixed wireless transmitters.

FAQ

What is the recommended DC bias configuration for the HMC453ST89?

The HMC453ST89 requires a single +5 V DC supply applied directly to Pin 3 (RFOUT), which serves as both RF output and bias input. No external bias sequencing or negative rails are needed. Decoupling capacitors (C6 = 100 pF, C8 = 2.2 μF) must be placed near Pin 3 to suppress supply noise and ensure stable operation across 0.4–2.2 GHz. The HMC453ST89 datasheet specifies 725 mA quiescent current at this condition.

Does the HMC453ST89 require external matching components?

Yes, the HMC453ST89 requires off-chip matching networks on both input (Pin 1) and output (Pin 3) to achieve specified gain, return loss, and linearity. Application circuits provided for 400 MHz, 900 MHz, 1900 MHz, and 2100 MHz bands use discrete inductors (e.g., L1 = 47 nH) and capacitors (e.g., C1 = 10 pF) to transform 50 Ω system impedance to the device's optimal terminations. These networks are essential for HMC453ST89 performance validation.

What is the thermal management requirement for reliable HMC453ST89 operation?

The HMC453ST89 has a junction-to-ground thermal resistance of 17.1 °C/W and must be mounted with all ground pins (2 and 4) and the exposed paddle soldered to a low-impedance RF ground plane. For continuous +32.5 dBm output at +85°C ambient, a minimum 1.5 cm² copper pour with ≥6 thermal vias is recommended. Exceeding 150°C junction temperature violates absolute maximum ratings and risks permanent damage to the HMC453ST89 die.

Can the HMC453ST89 be used in W-CDMA 64 DPCH applications?

Yes, the HMC453ST89 is explicitly characterized for W-CDMA 64 DPCH operation at 400 MHz, 2140 MHz, and other bands. At 2140 MHz with +5 V supply, it achieves −45 dBc adjacent channel power ratio (ACPR) at +26 dBm channel power-meeting 3GPP TS 25.104 requirements. This performance is confirmed in the HMC453ST89 datasheet Figure 9-178 (ACPR vs. Supply Voltage @ 2140 MHz), validating its suitability for HMC453ST89-based W-CDMA transmitters.

Is the HMC453ST89 RoHS-compliant?

No-the HMC453ST89 uses Sn/Pb lead finish and is not RoHS-compliant. Its RoHS-compliant variant is the HMC453ST89E, which features 100% matte tin plating and MSL1 rating with 260°C peak reflow tolerance. Both share identical electrical specifications and SOT-89 mechanical outline, but HMC453ST89 must be processed using leaded solder profiles (max 235°C). For new designs requiring RoHS compliance, HMC453ST89E is the designated replacement.