Analog Devices Inc. 104631-HMC364S8G

Overview

HMC364S8G from Analog Devices (formerly Hittite Microwave) is a GaAs HBT MMIC divide-by-2 static frequency divider operating from DC (square-wave input) to 12.5 GHz input frequency, delivering 4 dBm typical output power with -145 dBc/Hz SSB phase noise at 100 kHz offset and drawing 105 mA from a single +5 V supply. It serves as a prescaler in X-band PLL systems for satellite communications and point-to-point radios.

For engineers reviewing the HMC364S8G datasheet, HMC364S8G pinout, HMC364S8G application, or HMC364S8G equivalent, key selection criteria include its DC–12.5 GHz input bandwidth, differential RF input capability, 8-lead S8G surface-mount package, low additive phase noise performance, and operation without external biasing components.

Technical Context

The HMC364S8G implements a static logic divide-by-2 function using InGaP GaAs HBT technology, supporting both single-ended (pin 5 only, pin 7 AC-grounded) and true differential RF input (pins 5 and 7, 180° out-of-phase). It requires no external DC blocking on VCC or outputs but mandates DC blocking on RF inputs.

Its output stage delivers complementary square-wave signals at pins 1 and 3 (180° out-of-phase), with specified output transition time of 100 ps at 882 MHz and reverse isolation of 40 dB when both outputs are terminated. Thermal resistance is 69.3 °C/W junction-to-ground paddle.

Key Specifications

Pinout & Package

Package: 8-lead S8G surface-mount plastic package with exposed ground paddle; RoHS-compliant version is HMC364S8GE. Requires full-solder connection of ground paddle and all ground leads 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 HMC364S8G, HMC363S8G offers higher division ratio but reduced bandwidth, while HMC774A extends frequency range and improves phase noise at the cost of supply voltage and package incompatibility - neither is pin-compatible, requiring layout revision.

Availability

HMC364S8G is available at Aetrix Electronics and suitable for satellite communication upconverters, fiber optic transmitter clock recovery, and point-to-point microwave radio designs requiring stable component supply across extended temperature ranges and high-frequency performance.

Supply support for HMC364S8G 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 broader signal chain solutions.

The HMC364S8G belongs to Hittite's SMT GaAs HBT MMIC frequency divider family, engineered specifically for broadband prescaler applications in X-band PLL synthesizers for defense, aerospace, and telecom infrastructure.

FAQ

What is the maximum input frequency supported by the HMC364S8G?

The HMC364S8G supports a maximum input frequency of 12.5 GHz for sine-wave inputs and operates down to DC with square-wave inputs. Its electrical specifications confirm typical operation up to 13.5 GHz under favorable conditions, but 12.5 GHz is the guaranteed maximum for production designs per datasheet v04.1109. This makes HMC364S8G suitable for X-band prescaler roles in satellite and microwave radio systems.

Does the HMC364S8G require external DC blocking on its RF inputs?

Yes, the HMC364S8G requires external DC blocking capacitors on both RF input pins (5 and 7), as explicitly stated in the pin description and application circuit. The device is not internally DC-coupled at the RF inputs, and failure to implement proper blocking may cause bias disruption or damage. HMC364S8G evaluation board design (104631) uses 100 pF 0402 capacitors for this purpose.

Can the HMC364S8G operate with a 3.3 V supply instead of 5 V?

No, the HMC364S8G is specified exclusively for +5 V ±0.25 V operation. Absolute maximum rating for Vcc is +5.5 V, and supply current drops significantly below 4.75 V - datasheet shows Icc = 93 mA at 4.75 V and 115 mA at 5.25 V. Using 3.3 V will result in functional failure or severely degraded output power and phase noise. HMC364S8G must be powered from a regulated 5 V rail.

What is the role of pins 2 and 6 on the HMC364S8G?

Pins 2 and 6 are designated N/C (No Connection) in the official HMC364S8G datasheet - they have no internal bond wire or circuit connection and must remain unconnected. Neither grounding nor pulling them to any voltage is permitted. This is confirmed in the "Pin Description" table on page 4 of the datasheet v04.1109, and misconnection could compromise RF performance or reliability of the HMC364S8G.

Is the HMC364S8G still in active production?

No, the HMC364S8G is marked "OBSOLETE PRODUCT" in its official datasheet (v04.1109). While Aetrix Electronics maintains legacy inventory and supply support, new design-ins should consider alternatives like HMC774A for higher frequency or newer ADI-integrated solutions. Lifecycle availability coordination is available for HMC364S8G to support ongoing production programs.