Analog Devices Inc. 107010-HMC472LP4

Overview

HMC472LP4 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC 6-bit digital positive-control RF attenuator with 0.5 dB LSB, DC–3.8 GHz bandwidth, ±0.25 dB typical step error, and 31.5 dB max attenuation. It operates from a single +5 V supply and serves as a precision signal-level control device in cellular infrastructure RF front-ends.

For engineers reviewing the HMC472LP4 datasheet, HMC472LP4 pinout, HMC472LP4 application, or HMC472LP4 equivalent, key selection criteria include insertion loss (<2.3 dB), IIP3 (+45 dBm at low attenuation states), TTL/CMOS-compatible 6-bit control interface, and 24-lead 4×4 mm ceramic SMT package compatibility with RF PCB grounding requirements.

Technical Context

The HMC472LP4 implements a broadband GaAs MMIC architecture with six independent bit-controlled attenuation paths (0.5/1/2/4/8/16 dB), each driven by TTL/CMOS logic-level inputs (V1–V6). Its DC-coupled 50 Ω RF ports (RF1/RF2) require external blocking capacitors for sub-700 MHz operation.

AC ground pins (ACG1–ACG7) support extended low-frequency performance when externally bypassed; above 700 MHz, they may be left unconnected. Biasing uses a single +5 V supply (±10%), drawing 5.0 mA typical, with thermal design guided by 130 °C/W junction-to-case resistance.

Key Specifications

Pinout & Package

24-lead ceramic leadless surface-mount package (4×4 mm, 16 mm² footprint), RoHS-compliant variant HMC472LP4E available; exposed metal paddle must be soldered to PCB RF ground per Hittite land pattern guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital RF attenuator applications.

Compared with HMC472LP4E and QM11036, the HMC472LP4 delivers optimal balance of resolution, bandwidth, and compact 4×4 mm footprint for cost-sensitive 3G/LTE infrastructure-without sacrificing DC coupling capability or requiring PCB redesign.

Availability

HMC472LP4 is available at Aetrix Electronics and suitable for 3G infrastructure, LTE base stations, and RF test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.

Supply support for HMC472LP4 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, integrating its high-performance RF/Microwave portfolio into ADI's broader signal chain solutions.

The HMC472LP4 belongs to Hittite's broadband digital attenuator product line, designed specifically for RF front-end gain control in wireless infrastructure and instrumentation where precision, speed, and DC–GHz coverage are critical.

FAQ

What is the operating temperature range for the HMC472LP4?

The HMC472LP4 is rated for operation from –40 °C to +85 °C ambient temperature. Its GaAs MMIC process and ceramic package ensure stable RF performance across this full industrial range, with insertion loss and step error specifications guaranteed at +25 °C, –40 °C, and +85 °C per datasheet characterization. Thermal resistance is 130 °C/W, requiring adequate PCB copper area and thermal vias for sustained +85 °C operation.

Does the HMC472LP4 require external AC ground capacitors?

Yes - external AC ground capacitors on pins ACG1–ACG7 are recommended for operation below 700 MHz to maintain specified step accuracy and return loss. Above 700 MHz, these pins may be left unconnected per the datasheet. For DC–3.8 GHz coverage, low-ESR capacitors placed as close as possible to each ACG pin are essential to enable near-DC functionality without degrading high-frequency performance.

What is the maximum RF input power the HMC472LP4 can handle?

The HMC472LP4 supports +27 dBm RF input power at +85 °C ambient, with 0.1 dB compression occurring at +20 dBm across 0.1–3.8 GHz. Its absolute maximum rating allows brief exposure to +27 dBm, but sustained operation should remain ≤+20 dBm to preserve linearity and avoid accelerated degradation. Derating is required above +85 °C per the 7.7 mW/°C thermal dissipation limit.

How does the HMC472LP4 achieve DC coupling on its RF ports?

The HMC472LP4 achieves DC coupling through internal biasing architecture that permits direct connection of RF1 and RF2 to DC-biased signal paths. However, external blocking capacitors are mandatory on both RF ports to prevent DC offset from propagating into downstream components and to maintain 50 Ω impedance match. Capacitor value selection depends on the lowest operating frequency - e.g., 1000 pF for 50 MHz minimum.

Is the HMC472LP4 pin-compatible with the HMC472LP4E?

Yes - the HMC472LP4 and HMC472LP4E share identical pinout, package dimensions, electrical specifications, and thermal profile. The only differences are lead finish (Sn/Pb vs. 100% matte Sn) and moisture sensitivity level (MSL1 with 235 °C vs. 260 °C peak reflow). No PCB layout changes are needed when migrating between them; only reflow profile and handling procedures differ.