Analog Devices Inc. 130656-HMC972LP5E

Overview

HMC972LP5E from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC analog variable gain amplifier operating from 0.5 to 6.0 GHz, integrating two voltage-variable attenuators and an InGaP HBT gain block. It delivers 10.5 dB typical insertion gain at 0.5–2.7 GHz, −35 to +15 dB gain control range, +28 dBm output IP3, 7.5 dB noise figure, and requires no external matching components.

For engineers reviewing the HMC972LP5E datasheet, HMC972LP5E pinout, HMC972LP5E application, or HMC972LP5E equivalent, this device supports precise RF/IF gain management in microwave radios, 4G/WiMAX infrastructure, and test equipment where wide dynamic range, temperature-stable analog control (0–5 V), and compact 5×5 mm QFN packaging are critical.

Technical Context

The HMC972LP5E implements a cascaded architecture: ATT1 → AMP → ATT2, enabling flexible configuration with one or both attenuators active. Its analog control voltage (Vctl) linearly adjusts attenuation across the full −35 to +15 dB range without digital interface or calibration.

Operating from a single +5 V supply, it draws 90 mA typical Idd, with <0.3 mA per attenuator supply (ATT1Vdd/ATT2Vdd). The monolithic GaAs design ensures stable performance from −40 °C to +85 °C, with measured gain flatness ≤ ±2 dB over 0.5–4 GHz at Vctl = 0 V.

Key Specifications

Pinout & Package

32-lead 5×5 mm leadless QFN package with exposed ground paddle; RoHS-compliant low-stress plastic body, matte Sn lead finish, MSL1 rating. All ground pins (1–11, 14, 17–20, 22–23, 25, 27, 29–30, 24) and the exposed paddle must be soldered to RF/DC ground per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog variable gain amplifier applications.

Compared with HMC627ALP5E and QM11030, the HMC972LP5E uniquely balances wide analog gain range (−35 to +15 dB), +5 V operation, and no external matching-making it optimal for cost-sensitive, temperature-stable IF gain control in telecom and test equipment where analog interface fidelity is essential.

Availability

HMC972LP5E is available at Aetrix Electronics and suitable for cellular infrastructure, microwave radio backhaul, and RF test equipment requiring stable component supply, long-lifecycle support, and traceable sourcing for production programs.

Supply support for HMC972LP5E 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, delivering precision analog, RF, and microwave solutions for communications, defense, and instrumentation markets.

The HMC972LP5E belongs to Hittite's legacy GaAs MMIC variable gain amplifier product line, engineered specifically for analog-controlled RF/IF gain management in wireless infrastructure and test systems demanding wide dynamic range and temperature stability.

FAQ

What is the absolute maximum RF input power rating for the HMC972LP5E?

The HMC972LP5E has an absolute maximum RF input power rating of +12 dBm. Exceeding this level risks permanent damage to the InGaP HBT gain block or attenuator elements. For reliable operation, input power should be limited to ≤+5 dBm under normal conditions, especially at elevated temperatures or high Vctl settings where gain is maximized.

Does the HMC972LP5E require external DC blocking capacitors on all RF ports?

Yes, the HMC972LP5E requires external DC blocking capacitors on AMPIN (pin 26), AMPOUT (pin 21), ATT1IN (pin 32), ATT1OUT (pin 28), ATT2IN (pin 16), and ATT2OUT (pin 12). These ports are internally DC-biased; AC-coupling prevents unintended bias disruption and ensures proper 50 Ω RF termination across the full 0.5–6.0 GHz band.

Can the HMC972LP5E be operated with only one attenuator enabled?

Yes, the HMC972LP5E can be configured with either ATT1 only, ATT2 only, or both attenuators in cascade. When using a single attenuator, the unused attenuator's Vdd pin (ATT1Vdd or ATT2Vdd) must be tied to ground or left floating per design notes, and its IN/OUT ports must be terminated with 50 Ω loads to prevent reflections that degrade return loss and gain flatness.

What is the thermal resistance junction-to-paddle for the HMC972LP5E?

The HMC972LP5E has a thermal resistance of 120 °C/W from junction to exposed ground paddle. To maintain channel temperature below 150 °C, the PCB must provide low-thermal-resistance grounding: ≥6 thermal vias under the paddle, direct connection to inner ground planes, and adequate copper area-especially critical at 90 mA Idd and 0.55 W max dissipation at 85 °C ambient.

Is the HMC972LP5E pin-compatible with the HMC973LP3E attenuator?

No, the HMC972LP5E is not pin-compatible with the HMC973LP3E. While the HMC972LP5E's attenuator sections exhibit similar RF performance to the HMC973LP3E, their pinouts, supply requirements, and package sizes differ fundamentally: HMC973LP3E is a 16-lead 3×3 mm QFN, whereas HMC972LP5E is a 32-lead 5×5 mm QFN with integrated amplifier and dual attenuator routing.