Analog Devices Inc. 110209-HMC342LC4

Overview

HMC342LC4 from Analog Devices (formerly Hittite Microwave) is a GaAs pHEMT MMIC low-noise amplifier operating from 13 to 25 GHz, delivering 22 dB gain, 3.5 dB noise figure, and +19 dBm output IP3 at +3 V/43 mA - optimized for receive-chain amplification in millimeter-wave point-to-point radios and test instrumentation.

For engineers reviewing the HMC342LC4 datasheet, HMC342LC4 pinout, HMC342LC4 application, or HMC342LC4 equivalent, key selection criteria include its 4×4 mm RoHS-compliant SMT package, DC-blocked 50 Ω matched I/Os, temperature-stable gain variation (≤0.035 dB/°C), and absence of external matching components.

Technical Context

The HMC342LC4 employs a monolithic GaAs pHEMT process to achieve broadband LNA performance across three sub-bands: 13–18 GHz, 18–22 GHz, and 22–25 GHz. Its internal bias network enables single-supply operation with no external gate voltage tuning required.

RF input and output are AC-coupled and internally matched to 50 Ω, eliminating discrete matching networks. The exposed ground paddle and multiple ground pins ensure low-inductance RF grounding essential for stable >20 GHz operation.

Key Specifications

Pinout & Package

Package: 4×4 mm leadless ceramic SMT (alumina body, gold-over-nickel plating, MSL3, exposed ground paddle). Requires soldering all ground leads and paddle to PCB RF ground per JEDEC standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise amplifier applications.

Compared with HMC342LC4, HMC1099LP4E trades 0.5 dB noise figure for 3× wider bandwidth and higher current, while QPL9057 reduces power by 35% but sacrifices 4 dB gain and absolute linearity - making HMC342LC4 optimal for fixed-frequency, high-performance mmWave receive chains.

Availability

HMC342LC4 is available at Aetrix Electronics and suitable for point-to-point radios, VSAT terminals, and millimeter-wave test equipment requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for HMC342LC4 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 integrates its high-frequency RF portfolio into ADI's broader signal chain solutions, emphasizing precision, reliability, and mmWave innovation.

The HMC342LC4 belongs to Hittite's legacy GaAs MMIC LNA product line, engineered specifically for demanding microwave and millimeter-wave infrastructure - including wireless backhaul, defense EW systems, and automated test equipment.

FAQ

What is the recommended DC blocking capacitor value for the HMC342LC4 RF ports?

The HMC342LC4 features integrated DC blocking on both RFIN (Pin 3) and RFOUT (Pin 16), so no external DC blocking capacitors are required. This eliminates insertion loss and layout complexity associated with discrete capacitors - a key design advantage confirmed in the device's functional diagram and application circuit.

Does the HMC342LC4 require external bias sequencing or startup circuitry?

No. The HMC342LC4 operates from a single +3 V supply with no external gate bias or sequencing requirements. Its internal bias network automatically establishes proper pHEMT operating point - verified across −40 °C to +85 °C and confirmed in the "Typical Supply Current vs. Vdd" plot on page 4 of the datasheet.

Can the HMC342LC4 be used in transmit paths despite being labeled a "low noise amplifier"?

Yes. While optimized for low-noise receive functions, the HMC342LC4's +19 dBm OIP3 and +9 dBm P1dB make it suitable as a linear pre-driver in transmit chains - explicitly cited in the "Typical Applications" section for "transmit pre-driver applications" and validated in the "Gain, Power & Noise Figure vs. Supply Voltage" plot.

What is the thermal resistance and maximum channel temperature specification for the HMC342LC4?

The HMC342LC4 has a channel-to-ground thermal resistance of 276 °C/W and a maximum channel temperature rating of 175 °C. These values are defined in the Absolute Maximum Ratings table and support reliable operation at full rated power under +85 °C ambient when mounted on a properly designed PCB with adequate ground via density and optional heatsinking.

Is the HMC342LC4 pin-compatible with other Hittite 4×4 mm LNA packages like the HMC341LC4?

No. The HMC342LC4 uses a 24-pin configuration with specific pin assignments (e.g., Vdd on Pin 21, RFIN on Pin 3, RFOUT on Pin 16), whereas the HMC341LC4 is an 8-pin device with different pinout and biasing scheme. Direct substitution would require PCB redesign - confirmed by comparing respective outline drawings and pin descriptions in their official datasheets.