Analog Devices Inc. 106137-HMC695LP4

Overview

HMC695LP4 from Analog Devices (formerly Hittite Microwave) is a GaAs HBT MMIC active x4 frequency multiplier designed for LO generation in microwave systems. It delivers +7 dBm typical output power across 11.4–13.2 GHz while accepting -15 to +5 dBm input drive at 2.85–3.3 GHz, operates from a single +5 V supply drawing 60 mA, and achieves >25 dBc sub-harmonic suppression - ideal for point-to-point radio LO chains.

For engineers reviewing the HMC695LP4 datasheet, HMC695LP4 pinout, HMC695LP4 application, or HMC695LP4 equivalent, key selection criteria include its 4× multiplication factor, low additive SSB phase noise (-140 dBc/Hz @ 100 kHz), stable output vs. temperature/supply, and 24-lead 4×4 mm leadless SMT package requiring full ground paddle soldering.

Technical Context

The HMC695LP4 implements a monolithic GaAs HBT-based active frequency multiplication architecture with fixed 4× integer ratio. Its RF input (Pin 3) and output (Pin 16) are AC-coupled, and all 24 leads - including 16 N/C pins externally grounded - support broadband impedance matching and thermal dissipation via the exposed paddle.

It functions as a self-biased, DC-powered multiplier with no external bias network required. Input return loss ≥15 dB and output return loss ≥8 dB over the band ensure robust 50 Ω system integration, while its -40 °C to +85 °C operating range and MSL1 rating support industrial and defense-grade assembly.

Key Specifications

Pinout & Package

24-lead 4×4 mm leadless QFN package with exposed thermal paddle; RoHS-compliant Sn finish (HMC695LP4E) or Sn/Pb (HMC695LP4); MSL1 rating; max reflow 235 °C (Sn/Pb) or 260 °C (matte Sn).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC695LP4, HMC1084LP4E offers broader input bandwidth at slight output and efficiency cost, while QM11036 provides lower-cost alternative with relaxed phase noise and power specs - neither is pin-compatible, requiring layout revision and re-characterization.

Availability

HMC695LP4 is available at Aetrix Electronics and suitable for fiber optic transceivers, point-to-point radios, and military radar systems requiring stable component supply, consistent RF performance, and long-term obsolescence management.

Supply support for HMC695LP4 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-frequency RF/Microwave portfolio into ADI's Communications & RF Solutions group.

The HMC695LP4 belongs to Hittite's legacy GaAs HBT MMIC frequency multiplier family, engineered specifically for compact, high-efficiency LO synthesis in defense, aerospace, and broadband wireless infrastructure.

FAQ

What is the exact input frequency range supported by the HMC695LP4?

The HMC695LP4 supports an input frequency range of 2.85 GHz to 3.3 GHz, as specified in the electrical characteristics table under "Frequency Range, Input." This range is validated across temperature and supply voltage variations, and operation outside this band is not characterized or guaranteed. The HMC695LP4 maintains +7 dBm output and >25 dBc sub-harmonic suppression only within this defined input window.

Does the HMC695LP4 require external DC blocking capacitors on RFIN or RFOUT?

Yes - the HMC695LP4 requires an external DC blocking capacitor on the RFIN pin (Pin 3) only if the driving source applies DC voltage; the RFOUT pin (Pin 16) is internally AC-coupled and does not require external blocking. Evaluation board design uses 100 pF at RFIN and no capacitor at RFOUT, confirming this asymmetry. The HMC695LP4 datasheet explicitly states RFIN "needs to be DC blocked only if there is an external DC voltage applied."

What is the thermal resistance and maximum channel temperature for the HMC695LP4?

The HMC695LP4 has a junction-to-ground-paddle thermal resistance (Rth) of 93 °C/W and a maximum channel temperature of 135 °C. Its continuous power dissipation is rated at 538 mW at 85 °C ambient, derating linearly by 10.8 mW/°C above that temperature. These values are confirmed in the Absolute Maximum Ratings table and are critical for thermal pad soldering and PCB copper pour design in the HMC695LP4 layout.

Is the HMC695LP4 pin-compatible with the HMC695LP4E variant?

Yes - the HMC695LP4 and HMC695LP4E share identical pinout, package dimensions (4×4 mm), and electrical specifications; the only differences are RoHS compliance (matte Sn finish vs. Sn/Pb), MSL peak reflow temperature (260 °C vs. 235 °C), and package marking. Both variants mount identically on PCB and function interchangeably in circuit, making HMC695LP4E a direct drop-in replacement for new designs requiring RoHS compliance.

How does supply voltage variation affect output power stability in the HMC695LP4?

Output power of the HMC695LP4 varies less than ±0.3 dB over the full specified supply range of +4.75 V to +5.25 V at constant input drive and temperature, as shown in the "Output Power vs. Supply Voltage" plot. This exceptional stability means the HMC695LP4 maintains consistent LO level without regulation or feedback - a key advantage over discrete multiplier topologies. The HMC695LP4 achieves this via integrated HBT biasing and on-die current mirroring.