Analog Devices Inc. 107622-HMC426MS8

Overview

HMC426MS8 from Analog Devices (formerly Hittite Microwave) is a SiGe MMIC static frequency divider with divide-by-4 functionality, operating from DC (square-wave input) to 4.0 GHz input frequency on a single +3 V supply at 13 mA. It delivers +3.5 dBm typical output power at 1 GHz, exhibits ultra-low SSB phase noise of –146 dBc/Hz at 100 kHz offset (Fin = 3 GHz), and is housed in an 8-lead MS8 surface-mount plastic package. It serves as a prescaler in high-frequency PLL systems for wireless infrastructure.

For engineers reviewing the HMC426MS8 datasheet, HMC426MS8 pinout, HMC426MS8 application, or HMC426MS8 equivalent, key selection criteria include its DC–4 GHz input range, –146 dBc/Hz phase noise performance, +3 V / 13 mA supply requirement, differential input capability, and compatibility with RF prescaler designs in CATV, WLAN, and microwave radio systems.

Technical Context

The HMC426MS8 implements a static CMOS-compatible divide-by-4 logic architecture using SiGe heterojunction bipolar transistor (HBT) technology, enabling operation down to DC with square-wave inputs and up to 4.0 GHz with sine-wave inputs. Its differential input (pins 2 and 3) supports both single-ended and balanced drive configurations, while the output (pin 7) provides a CMOS-compatible square wave at one-quarter the input frequency.

Designed for RF prescaler use, it features integrated biasing and on-chip termination, requiring only external DC blocking on the RF input and proper RF grounding of pins 4 and 5. The device maintains stable performance across –40 °C to +85 °C and exhibits low harmonic content and high reverse isolation (25 dB).

Key Specifications

Pinout & Package

The HMC426MS8 is packaged in an 8-lead MS8 surface-mount plastic package (low-stress molded, Sn/Pb lead finish, MSL1). All ground leads (pins 4 and 5) must be soldered directly to PCB RF ground per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC363LP4E and ADF4002BRUZ, the HMC426MS8 offers optimal trade-off for fixed-ratio, low-noise prescaling at +3 V - delivering best-in-class phase noise within its 4 GHz bandwidth while minimizing bill-of-materials and layout overhead.

Availability

HMC426MS8 is available at Aetrix Electronics and suitable for DBS/CATV tuners, 802.11x WLAN radios, microwave VSAT systems, cellular infrastructure, and fixed wireless access equipment requiring stable component supply and proven RF performance.

Supply support for HMC426MS8 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 semiconductor leader specializing in high-performance analog, mixed-signal, and RF technologies for precision signal processing and connectivity.

The HMC426MS8 belongs to Analog Devices' legacy Hittite Microwave RF IC portfolio, engineered specifically for high-frequency prescaler and frequency translation applications in broadband wireless infrastructure and test equipment.

FAQ

What is the maximum input frequency supported by the HMC426MS8?

The HMC426MS8 supports a maximum input frequency of 4.0 GHz under typical conditions (TA = +25 °C, Vcc = +3 V), with absolute maximum rating extending to 4.5 GHz. Operation above 4.0 GHz may result in degraded output power and increased phase noise, and is not guaranteed across temperature or process variation. For reliable design, the 4.0 GHz limit should be observed in all HMC426MS8 applications.

Does the HMC426MS8 require external DC blocking on the RF input?

Yes, the HMC426MS8 requires external DC blocking capacitors on the RF input (pins 2 and 3) for sine-wave operation to prevent bias disruption. The device's internal bias network is optimized for AC-coupled RF drive; omitting DC blocking may cause instability or damage. For square-wave inputs down to DC, external blocking is still recommended unless the source provides precise DC level matching.

Can the HMC426MS8 operate with a supply voltage other than +3 V?

Yes, the HMC426MS8 operates across a supply range of +2.7 V to +3.3 V, with typical supply current scaling from 10 mA at 2.7 V to 16 mA at 3.3 V. Performance parameters-including output power, phase noise, and input sensitivity-are specified at +3.0 V; deviations outside this range may affect HMC426MS8 timing accuracy and noise floor, especially at temperature extremes.

Is the HMC426MS8 pin-compatible with the HMC426MS8E variant?

Yes, the HMC426MS8 and HMC426MS8E share identical pinout, electrical specifications, and mechanical outline. The sole difference is RoHS compliance: HMC426MS8E uses 100% matte tin lead finish and supports peak reflow up to 260 °C, whereas HMC426MS8 uses Sn/Pb and max reflow of 235 °C. Both variants function identically in the HMC426MS8 circuit layout.

What is the recommended PCB grounding practice for the HMC426MS8?

The HMC426MS8 requires direct soldering of pins 4 and 5 (GND) to a solid RF ground plane using multiple low-inductance vias. Per the datasheet, all ground leads must be connected to minimize parasitic inductance and maintain 50 Ω impedance integrity. Evaluation board 107622 uses Rogers 4350 substrate and specifies ≥6 vias per ground pin - this practice is essential to achieve specified HMC426MS8 phase noise and isolation performance.