Analog Devices Inc. 105190-HMC423MS8

Overview

The HMC423MS8 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC double-balanced mixer IC with integrated LO amplifier, operating as an upconverter or downconverter from 0.6 GHz to 1.3 GHz. It delivers 8 dB typical conversion loss, +15 dBm input IP3 at 1.3 GHz, and requires only 0 dBm LO drive while drawing 15 mA from a single +3 V supply - ideal for compact RF front-ends in portable wireless infrastructure.

For engineers reviewing the HMC423MS8 datasheet, HMC423MS8 pinout, HMC423MS8 application, or HMC423MS8 equivalent, key selection criteria include its integrated LO amplifier enabling low-drive operation, DC-coupled RF/IF ports, 50 Ω impedance matching across band, and MSL1 packaging suitable for high-reliability RF assembly.

Technical Context

This double-balanced mixer uses a GaAs MMIC architecture with monolithically integrated LO amplifier, eliminating external driver stages. Its balanced topology provides inherent suppression of even-order harmonics and LO leakage, supporting both upconversion and downconversion modes with IF bandwidth from DC to 400 MHz.

The device operates on a single +3 V rail, with all RF/LO/IF ports impedance-matched to 50 Ω over 0.6–1.3 GHz. Pin 4 (Vdd) powers the LO amplifier only; RF and IF paths are DC-coupled, requiring external DC blocking or biasing per application - no internal bias tees or transformers are present.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (Mini Small Outline Package), body size 3.0 mm × 3.0 mm × 1.1 mm, Sn/Pb lead finish, MSL1 rated. Ground pins (2, 3, 6, 7) must be soldered directly to RF ground plane with multiple vias for optimal isolation and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar double-balanced mixer applications.

Compared with HMC423MS8, HMC1048LP4E trades lower power consumption for broader bandwidth and higher drive, while ADL5802ACPZ-R7 shifts architecture toward quadrature conversion - neither offers pin compatibility or identical DC-coupled interface behavior.

Availability

HMC423MS8 is available at Aetrix Electronics and suitable for cellular base stations, portable wireless test instruments, CATV/DBS headend modules, and ISM-band transceivers requiring stable component supply and proven RF performance in production volumes.

Supply support for HMC423MS8 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 portfolio, including GaAs and SiGe MMICs for communications and defense applications.

The HMC423MS8 belongs to Hittite's legacy GaAs double-balanced mixer family, engineered specifically for low-LO-drive, high-linearity RF front-ends in infrastructure and portable wireless systems.

FAQ

What is the maximum RF input power rating for the HMC423MS8?

The HMC423MS8 has an absolute maximum RF input rating of +13 dBm at Vdd = +3 V. Exceeding this level risks permanent damage to the GaAs die. For reliable operation, the recommended maximum continuous RF input is +8 dBm (P1dB), with peak transient excursions limited to +10 dBm under controlled duty cycle conditions. Always verify input power levels in the final PCB layout using calibrated RF sources and directional couplers before full-system integration.

Does the HMC423MS8 require external DC blocking capacitors on RF or IF ports?

No - the HMC423MS8 features DC-coupled RF and IF ports, meaning no external DC blocking capacitors are needed unless the application explicitly requires AC coupling (e.g., to isolate DC bias between stages). Pin 8 (RF) and Pin 5 (IF) are internally DC-biased and rated for ±18 mA DC current. Adding series capacitors unnecessarily degrades low-frequency response and may introduce impedance discontinuities above 1 GHz.

Can the HMC423MS8 operate as both an upconverter and downconverter?

Yes - the HMC423MS8 is bidirectional and functions identically as either an upconverter or downconverter within its 0.6–1.3 GHz RF/LO band and DC–400 MHz IF range. Performance metrics such as conversion loss, IP3, and isolation are specified under downconversion conditions (IF = 100 MHz), but measured upconversion data confirms comparable behavior. System-level validation is required for specific LO/RF/IF combinations.

What is the recommended bypass capacitor value for the Vdd pin (Pin 4) of the HMC423MS8?

The datasheet specifies a 10,000 pF (10 nF) chip capacitor for Vdd bypassing on Pin 4. This value is optimized for low-impedance decoupling of the integrated LO amplifier across the 0.6–1.3 GHz band. Use a high-Q, low-ESL 0603 or 0805 ceramic capacitor placed within 2 mm of Pin 4 and connected to ground via multiple vias. Avoid substituting smaller values - insufficient capacitance increases LO ripple and raises conversion loss variation.

Is the HMC423MS8 RoHS-compliant?

The HMC423MS8 is not RoHS-compliant; it uses Sn/Pb lead finish and low-stress injection-molded plastic packaging. For RoHS-compliant alternatives, refer to the HMC423MS8E variant (same electrical specs, matte Sn finish, MSL1, 260 °C reflow rating). Both variants share identical pinout, package dimensions, and RF performance - only material composition and reflow profile differ.