Analog Devices Inc. 104631-HMC365S8G

Overview

104631-HMC365S8G from Analog Devices is a GaAs HBT MMIC divide-by-4 static frequency divider operating from DC (square-wave input) to 13 GHz with +5 V supply, 5 dBm typical output power, -151 dBc/Hz SSB phase noise at 100 kHz offset, and 110 mA supply current - used in Ku-band PLL prescalers for satellite communications and point-to-point radios.

For engineers reviewing the 104631-HMC365S8G datasheet, 104631-HMC365S8G pinout, 104631-HMC365S8G application, or 104631-HMC365S8G equivalent, key selection criteria include input frequency range (DC–13 GHz), differential/singles-ended RF input support, SOIC_N_EP package thermal performance, and low-phase-noise operation in RF synthesizer front-ends.

Technical Context

The 104631-HMC365S8G implements a static CMOS-compatible divide-by-4 function using InGaP GaAs HBT technology, enabling deterministic division without lock acquisition delay. It supports both single-ended input (pin 5 only, pin 7 AC-grounded) and true differential input (pins 5 and 7, 180° out-of-phase), with output signals on pins 1 and 3 also 180° out-of-phase.

Its DC-coupled operation requires square-wave input for sub-200 MHz frequencies, while sine-wave inputs are valid from 200 MHz to 13 GHz. The device maintains stable output power across temperature (-40°C to +85°C) and exhibits 100 ps output transition time at 882 MHz output, confirming fast edge integrity for clock distribution.

Key Specifications

Pinout & Package

104631-HMC365S8G uses an 8-lead SOIC_N_EP (narrow-body, exposed paddle) package per JEDEC MS-012-BA, with coplanarity ≤ 0.10 mm and thermal resistance R_TH = 65.8 °C/W (junction to ground paddle). The exposed metal slug must be soldered to PCB ground for thermal and RF performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC363S8G and HMC433MS8G, the 104631-HMC365S8G offers optimal balance of 13 GHz bandwidth, ultra-low phase noise, and +5 V compatibility - making it preferred for Ku-band satellite and microwave radio prescaling where division ratio and noise floor are primary constraints.

Availability

104631-HMC365S8G is available at Aetrix Electronics and suitable for satellite communication transceivers, fiber optic line cards, and point-to-point microwave radios requiring stable component supply, consistent parametric performance, and long-term obsolescence management.

Supply support for 104631-HMC365S8G 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, Inc. is a global leader in high-performance analog, mixed-signal, and RF ICs, serving precision instrumentation, communications, and industrial markets since 1965.

The HMC365S8G belongs to Analog Devices' Hittite Microwave MMIC frequency divider product line, engineered specifically for low-phase-noise, wideband RF prescaling in demanding wireless infrastructure and defense applications.

FAQ

What is the minimum input frequency supported by the 104631-HMC365S8G?

The 104631-HMC365S8G operates down to DC when driven with a square-wave input signal, per datasheet Note 1. For sine-wave inputs, the minimum usable frequency is 200 MHz (0.2 GHz), verified under typical conditions at +25°C with 50 Ω termination. This dual-mode capability makes the 104631-HMC365S8G suitable for both baseband clock division and RF prescaling applications.

Can the 104631-HMC365S8G be used in differential input mode?

Yes, the 104631-HMC365S8G supports true differential RF input via pins 5 and 7, which accept 180° out-of-phase signals. When used differentially, the device achieves improved common-mode rejection and reduced even-order harmonics compared to single-ended operation. The 104631-HMC365S8G datasheet specifies input power ranges separately for differential and single-ended configurations, confirming this dual-mode design.

What is the recommended PCB layout practice for the 104631-HMC365S8G exposed paddle?

The 104631-HMC365S8G's exposed ground paddle must be soldered to a solid PCB ground plane using ≥4 thermal vias (0.3 mm diameter, spaced ≤1 mm apart) to achieve the rated 65.8 °C/W thermal resistance. Per the evaluation board (104631), the paddle connects directly to the bottom-layer ground plane, and RF traces must maintain 50 Ω impedance with minimal stub length - critical for maintaining the 104631-HMC365S8G's 13 GHz performance.

Does the 104631-HMC365S8G require external biasing components?

No, the 104631-HMC365S8G integrates all necessary biasing internally and operates from a single +5 V supply. However, external decoupling is mandatory: the datasheet specifies 100 pF capacitors (0402) at pins 4 (Vcc) and 8 (GND), plus a 10 µF tantalum capacitor near the Vcc pin. These components stabilize supply impedance below 100 MHz and prevent oscillation - omission degrades 104631-HMC365S8G output power and phase noise.

How does the 104631-HMC365S8G handle harmonic content at its output?

The 104631-HMC365S8G exhibits measured harmonic suppression of ≥45 dB (reverse leakage) when both RF outputs are terminated, per datasheet test condition. Its output waveform shows clean square-like edges with <100 ps transition time, and harmonic plots confirm >30 dB suppression of 2nd and 3rd harmonics relative to fundamental output at 13 GHz input - enabling direct interface with mixers or filters without additional harmonic filtering for most 104631-HMC365S8G applications.