Analog Devices Inc. HMC344LP3ETR

Overview

HMC344LP3ETR from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SP4T non-reflective RF switch operating from DC to 8 GHz, delivering 1.8 dB insertion loss and 40 dB isolation at 6 GHz with integrated 2:4 TTL decoder logic. It uses negative 0/–5 V control and fixed –5 V bias, and is housed in a 16-lead 3×3 mm QFN package for broadband RF signal routing in 50 Ω systems.

For engineers reviewing the HMC344LP3ETR datasheet, HMC344LP3ETR pinout, HMC344LP3ETR application, or HMC344LP3ETR equivalent, key selection criteria include its non-reflective architecture, DC–8 GHz bandwidth, low insertion loss across temperature, integrated binary decoder reducing control lines to two, and RoHS-compliant matte Sn lead finish.

Technical Context

The HMC344LP3ETR implements a GaAs MESFET-based SP4T topology with on-chip 2:4 TTL decoder, enabling single-pole four-throw switching via two digital control inputs (CTLA, CTLB). Its non-reflective design terminates all off-state ports internally to 50 Ω, minimizing system VSWR impact during state transitions.

It operates with fixed –5 V VEE bias (±10%) and dual-rail negative logic control (0 V / –5 V), supporting fast switching (tRISE/tFALL = 35 ns, tON/tOFF = 150 ns) and high linearity (IP3 = 37–40 dBm, P1dB = 17–21 dBm) across –40 °C to +85 °C.

Key Specifications

Pinout & Package

Package: 16-lead 3×3 mm QFN with exposed ground paddle (MSL1, RoHS-compliant matte Sn finish, max reflow 260 °C). All ground leads and paddle must be soldered to PCB RF ground per Hittite land pattern guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SP4T RF switch applications.

Compared with HMC344LP3ETR, HMC349ALP4CE trades integrated termination for higher isolation and requires external 50 Ω resistors, while QM11036 extends bandwidth and power handling at the cost of decoder integration and control voltage compatibility.

Availability

HMC344LP3ETR is available at Aetrix Electronics and suitable for broadband test equipment, fiber-optic transceiver modules, and wireless infrastructure front-ends requiring stable component supply, RoHS compliance, and DC–8 GHz RF switching performance.

Supply support for HMC344LP3ETR 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 continues its legacy of high-performance RF and microwave ICs for communications, defense, and instrumentation markets.

The HMC344LP3ETR belongs to Hittite's GaAs MMIC SP4T switch product line, designed specifically for broadband, non-reflective RF signal routing in compact surface-mount systems demanding low loss, high isolation, and simplified digital control.

FAQ

What is the operating temperature range for the HMC344LP3ETR?

The HMC344LP3ETR is specified for continuous operation from –40 °C to +85 °C ambient temperature. Its thermal resistance (143 °C/W on insertion loss path) and internal GaAs MESFET design ensure stable RF performance across this range, with measured insertion loss and isolation varying within datasheet limits at both extremes.

Does the HMC344LP3ETR require external termination resistors?

No, the HMC344LP3ETR is a non-reflective SP4T switch with internal 50 Ω terminations on all off-state RF ports. This eliminates the need for external resistors, simplifying PCB layout and preserving system VSWR during switching - a key differentiator from reflective alternatives like the HMC349ALP4CE.

What control voltage levels does the HMC344LP3ETR accept on CTLA and CTLB?

The HMC344LP3ETR accepts TTL-compatible negative logic: "High" = 0 V (≤0.8 V), "Low" = –5 V (–5 V to –4.2 V). The control inputs draw only 5 µA typical in low state and 60 µA typical in high state, enabling direct interface with standard logic drivers without level-shifting circuitry.

How is the exposed ground paddle on the HMC344LP3ETR package used?

The exposed metal paddle on the bottom of the HMC344LP3ETR's 3×3 mm QFN package must be soldered to the PCB RF ground plane. Combined with pins 5, 14, and 16 (GND), this provides low-inductance RF return paths and thermal conduction - critical for achieving specified isolation, linearity, and junction temperature limits up to 150 °C.

Can the HMC344LP3ETR operate in 75 Ω systems?

Yes, the HMC344LP3ETR is characterized for use in both 50 Ω and 75 Ω systems. While optimized for 50 Ω matching (return loss ≥8 dB up to 6 GHz), its broadband GaAs MMIC architecture maintains functional performance in 75 Ω environments such as CATV and broadcast infrastructure, though insertion loss and isolation may vary slightly from 50 Ω specs.