Analog Devices Inc. 107928-HMC447LC3

Overview

HMC447LC3 from Analog Devices (formerly Hittite Microwave) is a GaAs HBT MMIC divide-by-4 regenerative frequency divider operating from 10 to 26 GHz, delivering -4 dBm output power with -150 dBc/Hz SSB phase noise at 100 kHz offset, and consuming 96 mA from a single +5 V supply - ideal for high-frequency PLLs and LO distribution in microwave radios.

For engineers reviewing the HMC447LC3 datasheet, HMC447LC3 pinout, HMC447LC3 application, or HMC447LC3 equivalent, key selection criteria include input frequency range (10–26 GHz), ultra-low phase noise performance, wide input power sensitivity window (-15 to +10 dBm depending on band), RoHS-compliant 3×3 mm leadless SMT package, and dual 5V supply pins requiring DC grounding of all N/C terminals.

Technical Context

The HMC447LC3 implements a regenerative divide-by-4 architecture using InGaP GaAs HBT technology, enabling broadband operation without external tuning components. Its differential-like regenerative feedback loop ensures stable division across 16 GHz bandwidth while maintaining flat gain and low harmonic content.

It accepts unbalanced RF input (Fin) and delivers a divided square-wave output (Fout = Fin/4) with 100 ps transition time, requiring DC blocking on both RF ports. Bias is applied via two dedicated +5 V pins (Vcc1, Vcc2), with exposed ground paddle mandatory for thermal and RF performance.

Key Specifications

Pinout & Package

Package: 3×3 mm leadless surface-mount ceramic package (alumina body, gold-over-nickel plating), MSL3, with exposed ground paddle on underside requiring direct connection to PCB RF ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC363LP4E and HMC774A, the HMC447LC3 uniquely balances 10–26 GHz coverage, -150 dBc/Hz phase noise, and compact 3×3 mm form factor - making it optimal for space-constrained, high-spectral-purity E-band prescaler designs.

Availability

HMC447LC3 is available at Aetrix Electronics and suitable for point-to-point radio prescalers, VSAT LO distribution systems, and fiber optic transmitter clocking requiring stable component supply, consistent RF performance, and RoHS-compliant packaging.

Supply support for HMC447LC3 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 integrates its high-frequency RF MMIC portfolio into precision RF signal chain solutions.

The HMC447LC3 belongs to Hittite's SMT GaAs HBT MMIC frequency divider family, engineered specifically for broadband microwave prescaling and LO distribution in wireless infrastructure and defense systems.

FAQ

What is the exact input frequency range supported by the HMC447LC3?

The HMC447LC3 supports an input frequency range of 10 to 26 GHz, with minimum input frequency specified at 9 GHz (min) and maximum at 27 GHz (max) under test conditions. Operation across the full 10–26 GHz band is guaranteed with specified output power, phase noise, and input sensitivity per frequency sub-bands.

Does the HMC447LC3 require external DC blocking on its RF ports?

Yes, the HMC447LC3 requires external DC blocking capacitors on both the RF input (Pin 3) and RF output (Pin 10). The device is not internally DC-coupled, and applying DC voltage or current to these pins will damage the HBT transistors or degrade performance.

What is the recommended PCB grounding method for the HMC447LC3?

The HMC447LC3's exposed ground paddle must be soldered directly to a solid RF ground plane on the PCB using multiple thermal vias. Pins 1, 2, 4–9, and 11 (N/C) may also be grounded, but the paddle connection is mandatory for thermal dissipation (R_TH = 84 °C/W) and RF return path integrity.

Can the HMC447LC3 operate from a supply voltage other than +5 V?

The HMC447LC3 is characterized and specified for +5 V ±0.25 V operation (4.75–5.25 V). Absolute maximum supply rating is +5.5 V. Operation outside this range risks parametric shift or permanent damage; supply current varies from 84 mA at 4.75 V to 108 mA at 5.25 V.

Is the HMC447LC3 pin-compatible with other Hittite divide-by-4 MMICs like the HMC774A?

No, the HMC447LC3 is not pin-compatible with the HMC774A. The HMC447LC3 uses a 16-pin 3×3 mm package with specific pin assignments (e.g., dual Vcc pins at 14/15, Fin at Pin 3, Fout at Pin 10), whereas the HMC774A uses a 24-pin 4×4 mm package with different pinout and biasing scheme.