Analog Devices Inc. 109712-HMC594LC3B

Overview

HMC594LC3B from Analog Devices is a GaAs pHEMT MMIC low-noise amplifier operating from 2 to 4 GHz, delivering 10 dB small-signal gain, 3 dB noise figure, and +36 dBm output IP3 with DC-blocked 50 Ω RF I/Os. It serves as the front-end LNA in microwave radios, radar receivers, and test equipment where flat gain (±0.2 dB), stable bias (5 V @ 95 mA or 6 V @ 100 mA), and RoHS-compliant 3×3 mm SMT packaging are critical.

For engineers reviewing the HMC594LC3B datasheet, HMC594LC3B pinout, HMC594LC3B application, or HMC594LC3B equivalent, key selection criteria include its 2–4 GHz bandwidth, 18–21 dBm P1dB, 22 dBm Psat, input/output return loss ≥15 dB/≥17 dB, and thermal resistance of 100 °C/W - all validated across –40°C to +85°C operation.

Technical Context

The HMC594LC3B employs a single-stage GaAs pHEMT MMIC architecture optimized for broadband low-noise amplification without internal matching networks. Its DC-blocked RF ports eliminate external DC blocking capacitors at I/O, while gate voltage (Vgg) is externally adjustable (–1.5 V to –0.5 V) to stabilize supply current across 5 V or 6 V operation.

Thermal design is integral: the exposed ground paddle must be soldered to PCB RF/DC ground, and the package's 100 °C/W channel-to-ground thermal resistance requires adequate via density and heatsinking. Absolute maximum ratings include 7 V drain bias and +15 dBm RF input power at Vdd = +6 V.

Key Specifications

Pinout & Package

RoHS-compliant 3×3 mm ceramic SMT package (alumina body, gold-over-nickel plating, MSL3 rating) with exposed ground paddle requiring full-surface soldering to PCB RF ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC594LC3B, HMC594LC3TR offers identical RF performance in production-ready packaging, while QPL9057 trades some gain flatness and integrated DC blocking for lower noise and lower voltage operation - making each suitable for distinct system-level trade-offs in dynamic range, power, and layout complexity.

Availability

HMC594LC3B is available at Aetrix Electronics and suitable for fixed microwave radio, radar & sensor, and test & measurement equipment requiring stable component supply, consistent RF performance across temperature, and RoHS-compliant SMT packaging.

Supply support for HMC594LC3B 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 leader in high-performance analog, mixed-signal, and RF ICs, serving industrial, communications, automotive, and defense markets with precision signal processing solutions.

The HMC594LC3B belongs to Analog Devices' Hittite Microwave MMIC product line, engineered specifically for broadband RF front-end applications demanding low noise, high linearity, and ruggedized SMT packaging in defense and instrumentation systems.

FAQ

What is the recommended DC bias configuration for HMC594LC3B?

The HMC594LC3B requires two DC supplies: Vdd (5 V or 6 V applied to Pin 11) and Vgg (adjustable gate voltage from –1.5 V to –0.5 V applied to Pin 5). At 5 V, set Vgg to achieve 95 mA Idd; at 6 V, adjust Vgg for 100 mA Idd. External bypassing with 100 pF, 1000 pF, and 2.2 µF capacitors is mandatory on both supplies to prevent oscillation and ensure stability across 2–4 GHz.

Does HMC594LC3B require external DC blocking capacitors at RF ports?

No - the HMC594LC3B features integrated DC blocking at both RFIN (Pin 2) and RFOUT (Pin 8), eliminating the need for external series capacitors. This simplifies layout, reduces insertion loss, and improves repeatability in production. The 50 Ω impedance match remains valid across the full 2–4 GHz band without additional tuning components.

What is the thermal management requirement for HMC594LC3B in continuous operation?

HMC594LC3B has a channel-to-ground thermal resistance of 100 °C/W. To maintain junction temperature below 175 °C at +85°C ambient, the PCB must provide robust thermal conduction: the exposed ground paddle must be fully soldered to a solid ground plane with ≥6 thermal vias (0.3 mm diameter, spaced ≤2 mm apart), and the board should be mounted to a heatsink if power dissipation exceeds 0.5 W.

Can HMC594LC3B operate outside the 2–4 GHz band?

While the HMC594LC3B exhibits gain beyond 2–4 GHz, only parameters within this band are guaranteed per datasheet specifications. Below 2 GHz, gain drops significantly and input match degrades; above 4 GHz, noise figure rises and OIP3 declines. For reliable performance, system design must constrain operation strictly to the 2–4 GHz band - especially in calibrated test equipment and military comms where specification compliance is mandatory.

Is HMC594LC3B pin-compatible with other HMC594 variants?

Yes - HMC594LC3B shares identical pinout, footprint, and electrical interface with HMC594LC3TR and the bare-die HMC594. All three use the same 3×3 mm ceramic package with pins numbered identically. However, HMC594LC3B is supplied in cut-tape format optimized for prototyping and low-volume assembly, whereas HMC594LC3TR is tape-and-reel for high-speed pick-and-place.