Analog Devices Inc. HMC349AMS8GETR

Overview

HMC349AMS8GETR from Analog Devices is a gallium arsenide (GaAs) pseudo-morphic high electron mobility transistor (PHEMT) single-pole double-throw (SPDT) RF switch operating from 100 MHz to 4 GHz, delivering 57 dB isolation at 2 GHz, 0.9 dB insertion loss at 2 GHz, and +34 dBm P1dB at 5 V supply - deployed in cellular infrastructure front-end modules for antenna switching and TDD/FDD path selection.

For engineers reviewing the HMC349AMS8GETR datasheet, HMC349AMS8GETR pinout, HMC349AMS8GETR application, or HMC349AMS8GETR equivalent, this page provides verified functional behavior, thermal derating curves, CMOS/TTL-compatible dual-control logic mapping, and nonreflective 50 Ω architecture details critical for RF layout, power handling validation, and hot-switching reliability assessment.

Technical Context

The HMC349AMS8GETR implements a nonreflective SPDT topology with internal 50 Ω terminations on both throw ports when off, enabling stable impedance matching across all states. Its GaAs PHEMT process supports high linearity (IP3 = 52 dBm typ.) and robust power handling (33.5 dBm through path at 5 V, 85°C).

Control is managed via two independent logic inputs - EN (enable) and CTRL (path select) - supporting three operational modes: RF1–RFC active, RF2–RFC active, or both paths isolated. The driver integrates level-shifting and internal termination biasing, eliminating external pull-up/down resistors.

Key Specifications

Pinout & Package

Package: 8-lead mini small outline package with exposed pad (MINI_SO_EP, JEDEC MO-187-AA-T, package option RH-8-1); exposed pad must be soldered to PCB RF/dc ground for thermal and RF performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with QM11036 and SKY13370-374LF, the HMC349AMS8GETR delivers superior isolation (57 dB vs. ≤52 dB), higher power handling (33.5 dBm vs. ≤31 dBm), and integrated all-off functionality - making it uniquely suited for thermally demanding, high-linearity macro base station and test equipment applications.

Availability

HMC349AMS8GETR is available at Aetrix Electronics and suitable for cellular infrastructure, 5G massive MIMO antenna arrays, and wireless test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for HMC349AMS8GETR 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 communications, industrial, automotive, and aerospace markets with precision signal processing solutions.

The HMC349AMS8GETR belongs to Analog Devices' Hittite Microwave RF switch product line, engineered specifically for high-isolation, high-linearity, and high-power RF front-end applications in wireless infrastructure and instrumentation.

FAQ

What is the maximum RF input power the HMC349AMS8GETR can handle in the through path?

The HMC349AMS8GETR supports up to +33.5 dBm RF input power in the through path when operated at VDD = 5 V and TCASE = 85°C. At 125°C case temperature, the rating reduces to +28 dBm. Derating is required below 250 MHz per Figure 2 in the datasheet, and hot-switching limits are separately specified at +30 dBm (85°C) and +24.5 dBm (125°C). These values are measured with proper thermal grounding of the exposed pad.

Does the HMC349AMS8GETR require external DC blocking capacitors on its RF ports?

Yes, the HMC349AMS8GETR requires external DC blocking capacitors on RFC, RF1, and RF2 because all RF ports are dc-coupled and internally biased. The evaluation board uses 100 pF 0402 capacitors (C1–C3), and the datasheet specifies that these capacitors must be placed as close as possible to the package pins to maintain 50 Ω impedance and minimize parasitic inductance. Omitting them risks DC current flow and potential damage.

How does the EN pin affect the operation of the HMC349AMS8GETR?

When EN is logic high, the HMC349AMS8GETR forces both RF1 and RF2 paths into a terminated isolation state regardless of CTRL state - RFC becomes open reflective, and RF1/RF2 are each internally terminated to 50 Ω. This all-off mode prevents RF leakage during standby or fault conditions. When EN is logic low, CTRL determines which path (RF1 or RF2) connects to RFC, enabling normal SPDT operation.

Is the HMC349AMS8GETR pin-compatible with the HMC349AMS8G or HMC349AMS8GE variants?

Yes, the HMC349AMS8GETR is pin-compatible and functionally identical to HMC349AMS8G and HMC349AMS8GE - all share the same MINI_SO_EP (RH-8-1) package, pinout, electrical specifications, and thermal profile. The suffix differences indicate tape-and-reel (TR), lead-free (E), and RoHS compliance (GETR), but no functional or mechanical distinctions exist between these ordering variants.

What is the thermal resistance from junction to case (θJC) for the HMC349AMS8GETR?

The HMC349AMS8GETR has a junction-to-case thermal resistance (θJC) of 67.1°C/W for the through path and 144.2°C/W for the terminated path, as specified in Table 2 of the Rev. F datasheet. Effective thermal management requires soldering the exposed pad to a large, multi-via ground plane; thermal performance degrades significantly if the EPAD is left unconnected or under-soldered.