Analog Devices Inc. 106137-HMC444LP4

Overview

106137-HMC444LP4 from Analog Devices (formerly Hittite Microwave) is an active GaAs HBT MMIC x8 frequency multiplier designed for LO generation in X-band systems. It delivers +6 dBm typical output power across 9.9–11.2 GHz output range from a +5 V supply, with >25 dBc sub-harmonic suppression and −136 dBc/Hz SSB phase noise at 100 kHz offset - enabling high-fidelity local oscillator chains in radar and point-to-point radios.

For engineers reviewing the 106137-HMC444LP4 datasheet, 106137-HMC444LP4 pinout, 106137-HMC444LP4 application, or 106137-HMC444LP4 equivalent, key selection criteria include its fixed x8 multiplication ratio, 4×4 mm leadless SMT package, input drive range (−15 to +5 dBm), stable output power vs. temperature/voltage, and RF I/O AC-coupling requirements.

Technical Context

The 106137-HMC444LP4 implements an InGaP GaAs HBT-based active multiplier architecture optimized for eighth-harmonic generation. Its input operates from 1.2375–1.40 GHz, producing clean 9.9–11.2 GHz output with minimal sensitivity to input power variation, supply voltage drift (4.5–5.5 V), and temperature (−40 to +85 °C).

It features integrated biasing and on-chip matching networks, requiring only external DC blocking on RFIN and no external DC blocks on RFOUT. All ground pins (4, 15) and the exposed paddle must be soldered to PCB RF ground per Hittite's land pattern guidelines.

Key Specifications

Pinout & Package

24-lead 4×4 mm leadless surface-mount package (16 mm² footprint) with exposed ground paddle; RoHS-compliant Sn/Pb finish (MSL1, peak reflow 235 °C); marking "H444" followed by 4-digit lot code.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar active frequency multiplier applications.

Compared with HMC444LP4E and HMC575LP3, the 106137-HMC444LP4 offers optimal balance of x8 multiplication, X-band coverage, and thermal stability in Sn/Pb assembly environments - making it preferred for cost-sensitive, high-volume radar and radio OEM production.

Availability

106137-HMC444LP4 is available at Aetrix Electronics and suitable for military radar transceivers, point-to-point microwave radios, and fiber optic RF-over-fiber links requiring stable component supply and long-term obsolescence management.

Supply support for 106137-HMC444LP4 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 continues to manufacture, support, and qualify its high-frequency RF MMIC portfolio including GaAs HBT and pHEMT products.

The 106137-HMC444LP4 belongs to Hittite's active frequency multiplier product line, engineered specifically for high-performance LO generation in defense, aerospace, and wireless infrastructure where phase noise, harmonic suppression, and thermal reliability are critical.

FAQ

What is the input frequency range supported by the 106137-HMC444LP4?

The 106137-HMC444LP4 accepts RF input signals from 1.2375 GHz to 1.40 GHz. This range is precisely selected to enable clean eighth-harmonic multiplication into the 9.9–11.2 GHz X-band output window. Operation outside this band results in degraded output power and increased spurious content. The 106137-HMC444LP4 datasheet specifies input return loss ≥22 dB across this span, confirming optimal impedance match.

Does the 106137-HMC444LP4 require external DC blocking on its RFOUT pin?

No, the 106137-HMC444LP4 RFOUT pin is internally AC-coupled, so no external DC blocking capacitor is needed. However, the RFIN pin requires an external DC block only if the driving source applies DC bias - otherwise, it may be connected directly. This design simplifies board layout and reduces parasitic discontinuities in high-frequency signal paths for the 106137-HMC444LP4.

What is the maximum allowable supply voltage for the 106137-HMC444LP4?

The absolute maximum supply voltage for the 106137-HMC444LP4 is +5.5 V DC. Operating above this risks permanent damage to the GaAs HBT core. The device is characterized for stable performance from 4.5 V to 5.5 V, with typical supply current increasing from 66 mA to 70 mA across that range. For reliable long-term operation, maintain Vcc at +5.0 V ±0.5 V as specified in the 106137-HMC444LP4 datasheet.

How does the 106137-HMC444LP4 handle thermal dissipation in enclosed RF modules?

With a thermal resistance (Rth) of 100 °C/W (junction to ground paddle), the 106137-HMC444LP4 relies on proper PCB grounding of all ground pins and the exposed paddle to achieve effective heat transfer. At 68 mA and 5 V, it dissipates ~340 mW - well below its 650 mW continuous limit at 85 °C. To ensure reliability in sealed enclosures, the 106137-HMC444LP4 must be mounted on a 4-layer board with internal ground planes and thermal vias under the paddle per Hittite Application Note land pattern guidance.

Is the 106137-HMC444LP4 pin-compatible with the HMC444LP4E variant?

Yes, the 106137-HMC444LP4 is mechanically and electrically pin-compatible with the HMC444LP4E. Both share identical 24-pin 4×4 mm leadless package outlines, pin functions, and electrical specifications. The sole difference is lead finish: Sn/Pb for 106137-HMC444LP4 versus 100% matte Sn for HMC444LP4E. No PCB redesign is required when migrating between them, though reflow profile must be adjusted to 260 °C peak for the RoHS-compliant variant.