Analog Devices Inc. HMC346ALP3ETR

Overview

HMC346ALP3ETR from Analog Devices is a GaAs MMIC voltage-variable attenuator (VVA) operating from DC to 14 GHz, delivering 30 dB attenuation range with low phase shift vs. attenuation, 2.7 dB typical insertion loss at 10 GHz, and absorptive architecture for broadband RF signal level control in analog DC-controlled systems.

For engineers reviewing the HMC346ALP3ETR datasheet, HMC346ALP3ETR pinout, HMC346ALP3ETR application, or HMC346ALP3ETR equivalent, key selection criteria include its 3 mm × 3 mm LFCSP package, dual-control-voltage interface (V1/V2), -5 V to 0 V analog control range, 8 ns RF rise/fall time, and suitability for high-linearity microwave infrastructure where stable amplitude control across DC–14 GHz is required.

Technical Context

The HMC346ALP3ETR implements an absorptive GaAs MMIC topology with on-chip reference attenuator enabling single-supply op-amp-based control. It supports dual master control inputs (V1, V2) and one slave input (I), maintaining 50 Ω RF port match across full attenuation range without external matching networks.

Its architecture delivers flat insertion loss (2.6–3.2 dB) and return loss ≥10 dB from DC to 14 GHz, while preserving linearity: input IP3 reaches +30 dBm at minimum attenuation and remains >+10 dBm above 2 dB attenuation, supporting high-dynamic-range microwave signal chains.

Key Specifications

Pinout & Package

Package: 16-lead Lead Frame Chip Scale Package (LFCSP), 3 mm × 3 mm body, 0.85 mm height, JEDEC MO-220-VEED-4 compliant, with exposed thermal pad requiring connection to PCB RF ground.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-variable attenuator applications.

Compared with HMC346ALP3ETR, HMC650LP3E extends usable bandwidth but trades off insertion loss and power handling, while QM11036 reduces frequency range and thermal robustness to achieve lower unit cost-making HMC346ALP3ETR the balanced choice for DC–14 GHz infrastructure requiring linearity, speed, and reliability.

Availability

HMC346ALP3ETR is available at Aetrix Electronics and suitable for basestation infrastructure, fiber optics & broadband telecom, and microwave radio & VSAT applications requiring stable component supply, RoHS-compliant packaging, and traceable sourcing for production ramp.

Supply support for HMC346ALP3ETR 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 precision instrumentation, communications, and industrial markets since 1965.

The HMC346ALP3ETR belongs to Analog Devices' Hittite Microwave MMIC product line, engineered specifically for broadband RF signal conditioning in wireless infrastructure, defense electronics, and high-speed test equipment.

FAQ

What is the absolute maximum RF input power rating for the HMC346ALP3ETR?

The HMC346ALP3ETR has an absolute maximum RF input power rating of +18 dBm. Exceeding this level risks permanent damage to the GaAs die, especially under high attenuation states where power dissipation concentrates in internal resistive elements. Always ensure peak RF input remains below +18 dBm across all operating temperatures and attenuation settings when designing with the HMC346ALP3ETR.

Does the HMC346ALP3ETR require external DC blocking capacitors on its RF ports?

Yes, the HMC346ALP3ETR RF ports (pins 2 and 11) are DC-coupled and internally biased. If the connected RF source or load presents a DC potential other than 0 V, external DC blocking capacitors must be placed in series with both RF paths to prevent bias disruption and potential device malfunction. This requirement applies regardless of attenuation setting and is critical for repeatable performance of the HMC346ALP3ETR.

How does the HMC346ALP3ETR achieve impedance match across its full attenuation range?

The HMC346ALP3ETR achieves broadband 50 Ω match using an absorptive architecture with integrated termination resistors and on-chip reference attenuator circuitry. Unlike reflective VAAs, it absorbs excess RF energy rather than reflecting it-ensuring return loss remains ≥10 dB from DC to 14 GHz at all attenuation levels. This design eliminates the need for external matching components when using the HMC346ALP3ETR in sensitive signal chains.

Can the HMC346ALP3ETR operate with only one control voltage applied?

No-the HMC346ALP3ETR requires simultaneous application of control voltages to both V1 (pin 5) and V2 (pin 8) for proper operation; applying voltage to only one master input results in undefined attenuation behavior and degraded RF performance. The I pin (pin 6) must also be driven by an external op-amp configured per the datasheet's single-line control schematic to maintain port match-full functionality of the HMC346ALP3ETR depends on this three-terminal control scheme.

Is the exposed thermal pad on the HMC346ALP3ETR package electrically connected to ground?

Yes, the exposed thermal pad on the bottom of the HMC346ALP3ETR LFCSP package is internally connected to ground and must be soldered to a dedicated PCB RF ground plane. This connection serves dual purposes: it provides a low-inductance RF return path essential for return loss performance and enables effective heat dissipation given the device's 10 °C/W junction-to-case thermal resistance-failure to properly ground the pad will degrade both electrical and thermal performance of the HMC346ALP3ETR.