Analog Devices Inc. 105675-HMC432

Overview

HMC432 from Analog Devices (formerly Hittite Microwave) is a GaAs HBT MMIC divide-by-2 static frequency divider operating from DC (square-wave input) to 8 GHz with single-ended I/O, +3 V supply, and ultra-low SSB phase noise of –148 dBc/Hz at 100 kHz offset - used in prescaler stages for C-band PLLs in VSAT radios and 802.11a WLAN infrastructure.

For engineers reviewing the HMC432 datasheet, HMC432 pinout, HMC432 application, or HMC432 equivalent, key selection considerations include its DC–8 GHz input range, –3 to –9 dBm output power, SOT26 package footprint, 42 mA supply current at 3 V, and compatibility with RF systems requiring low-additive phase noise and minimal external components.

Technical Context

The HMC432 implements a static CMOS-compatible divide-by-2 logic core using InGaP GaAs HBT technology, enabling operation down to DC with square-wave inputs while maintaining deterministic timing behavior. Its single-ended architecture eliminates need for baluns or differential routing, reducing board area and insertion loss.

It delivers divided output at precisely half the input frequency with sub-150 ps transition time and suppresses harmonics and feedthrough via internal biasing and optimized transistor sizing. Reverse leakage is limited to –30 dBm under specified test conditions, supporting stable cascaded RF chain performance.

Key Specifications

Pinout & Package

SOT26 plastic surface-mount package (9 mm² footprint), RoHS-compliant variant marked "432E", MSL1 rating, Sn/Pb or matte Sn lead finish, thermal resistance 108 °C/W (junction-to-ground paddle).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC432, HMC363 extends bandwidth at the cost of higher power and thermal load, while ADF4002 trades discrete simplicity for programmable PLL functionality - making HMC432 optimal for fixed-ratio, low-noise, low-power prescaling where minimal external components are critical.

Availability

HMC432 is available at Aetrix Electronics and suitable for VSAT radio development, 802.11a infrastructure design, and fiber optic transmitter LO generation requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for HMC432 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 maintains its high-frequency RF product lines, including GaAs MMICs for microwave and millimeter-wave applications.

The HMC432 belongs to Hittite's SMT GaAs HBT MMIC frequency divider family, designed specifically for low-phase-noise prescaling in wireless infrastructure, test equipment, and broadband communications systems.

FAQ

What is the minimum input frequency supported by the HMC432?

The HMC432 supports DC input for square-wave signals, meaning it can divide arbitrarily low-frequency digital clocks. For sine-wave inputs, the minimum usable frequency is 0.2 GHz per datasheet specifications. This dual-mode capability makes the HMC432 uniquely suitable for both digital clock domain translation and analog RF prescaling applications - a feature confirmed in the device's absolute maximum ratings and electrical specifications table.

Does the HMC432 require external DC blocking capacitors?

Yes, the HMC432 requires DC blocking capacitors at both the IN (Pin 3) and OUT (Pin 6) ports to prevent disruption of internal bias networks. The evaluation board uses 100 pF 0402 capacitors, sized for the lowest operating frequency in the target band. Failure to include these capacitors risks forward-biasing internal transistors and degrading phase noise or causing functional failure - a requirement explicitly stated in the application circuit notes and pin description section of the HMC432 datasheet.

What is the recommended supply voltage range for the HMC432?

The HMC432 operates with a nominal +3.0 V supply, rated from –0.3 V to +3.5 V relative to ground. Typical supply current is 42 mA at exactly 3.0 V, rising to 50 mA at 3.3 V and dropping to 34 mA at 2.7 V. Stable regulation within ±0.3 V is recommended to maintain specified phase noise and output power performance - values verified across temperature and process corners in the electrical specifications table.

Can the HMC432 be used in a differential configuration?

No, the HMC432 is strictly a single-ended device with dedicated IN and OUT pins; it does not support differential input or output. Its functional diagram, pinout, and application schematic all show unbalanced RF paths. Attempting differential drive would result in degraded common-mode rejection, increased phase noise, and potential damage due to improper biasing - a limitation clearly defined in the "Functional Diagram" and "Interface Schematic" sections of the official HMC432 documentation.

What is the thermal resistance and maximum junction temperature of the HMC432?

The HMC432 has a thermal resistance of 108 °C/W (junction-to-ground paddle) and a maximum rated junction temperature of 135 °C to maintain 1 million hour MTTF. At 85 °C ambient and 42 mA supply current, the calculated junction temperature is approximately 99 °C - well within safe operating limits. This thermal data is documented in the Absolute Maximum Ratings and Reliability Information tables, confirming suitability for convection-cooled RF modules.