Analog Devices Inc. 104124-HMC174MS8

Overview

HMC174MS8 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SPDT transmit/receive switch for RF front-end signal routing in DC–3 GHz systems. It delivers 0.5 dB typical insertion loss at 2 GHz, +60 dBm input IP3 at 8 V bias, and supports positive CMOS/TTL-compatible control (0/+8 V). Its primary role is high-linearity T/R path selection in cellular/3G/WiMAX transceivers and LNA protection circuits.

For engineers reviewing the HMC174MS8 datasheet, HMC174MS8 pinout, HMC174MS8 application, or HMC174MS8 equivalent, key selection criteria include its 0.5 dB insertion loss at 2 GHz, +60 dBm IIP3 at 8 V, MSOP-8 package with RFC/RF1/RF2 50 Ω DC-coupled ports, and single-supply operation from 3–10 V with <500 µA quiescent current.

Technical Context

The HMC174MS8 integrates a GaAs MMIC SPDT switch core with on-chip bias control logic enabling single positive supply operation (3–10 V) and TTL/CMOS-compatible A/B control inputs. Its reflective OFF-state architecture ensures RF1 and RF2 present shorts when inactive, minimizing signal leakage in T/R isolation-critical paths.

Designed for DC–3 GHz broadband operation, it maintains ≤1.8 dB insertion loss and ≥15 dB isolation up to 3 GHz while delivering >32 dBm P1dB across 0.5–3 GHz at 8 V bias - critical for high-power portable wireless and infrastructure repeater front ends.

Key Specifications

Pinout & Package

Package: MSOP-8, low-stress injection-molded plastic, Sn/Pb lead finish, MSL1 rated (235 °C peak reflow). Ground pins (6, 7) must be soldered to RF ground plane; RFC, RF1, RF2 are DC-coupled 50 Ω ports requiring external blocking capacitors.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SPDT T/R switch applications.

Compared with HMC174MS8E, the HMC174MS8 offers identical RF performance with Sn/Pb finish for legacy reflow profiles, while QM11036 trades linearity and simplicity for smaller footprint - making HMC174MS8 the optimal choice for high-dynamic-range, ease-of-use T/R switching in infrastructure and automotive applications.

Availability

HMC174MS8 is available at Aetrix Electronics and suitable for cellular infrastructure repeaters, portable wireless transceivers, and automotive telematics modules requiring stable component supply and guaranteed long-term availability.

Supply support for HMC174MS8 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 high-frequency RF IC portfolio, specializing in GaAs and SiGe MMIC solutions for communications, defense, and instrumentation.

The HMC174MS8 belongs to Hittite's legacy GaAs SPDT switch product line, engineered specifically for broadband T/R front-end routing in cellular, WiMAX, and test equipment where low loss, high isolation, and exceptional linearity are mandatory.

FAQ

What is the maximum RF input power the HMC174MS8 can handle without compression?

The HMC174MS8 delivers 36 dBm input P1dB at 0.5–3.0 GHz when biased at 8 V, meaning it sustains linear operation up to approximately 4 W RF input power before 1 dB gain compression occurs. At 5 V bias, P1dB drops to 32 dBm (1.6 W), and at 3 V it remains 32 dBm - confirming robust high-power capability only at elevated Vdd.

Does the HMC174MS8 require external DC blocking capacitors on its RF ports?

Yes, the HMC174MS8 requires external DC blocking capacitors on RFC, RF1, and RF2 because all three ports are DC-coupled and internally matched to 50 Ω. Capacitor value determines the low-frequency cutoff - e.g., a 100 pF capacitor sets f_low ≈ 32 MHz - and must be placed as close as possible to the package pins for optimal RF performance.

What is the recommended PCB grounding strategy for the HMC174MS8?

Ground pins 6 and 7 must be soldered directly to a solid, low-inductance RF ground plane using multiple vias. The package ground leads form part of the RF return path; inadequate grounding degrades isolation (≤20 dB) and increases insertion loss. Evaluation board layout uses Rogers 4350 substrate with 50 Ω microstrip lines and direct GND via stitching beneath the MSOP-8 body.

Can the HMC174MS8 operate with 3.3 V logic control signals while powered from a 5 V supply?

Yes - the HMC174MS8 accepts control voltages from 0 V to Vdd, so with Vdd = 5 V, logic-high inputs of 3.3 V are fully valid (within ±0.2 V tolerance). Its A/B inputs draw only ~100 µA, enabling direct connection to 3.3 V FPGA GPIO or MCU outputs without level shifters or pull-up resistors.

Is the HMC174MS8 pin-compatible with the HMC174MS8E?

Yes, the HMC174MS8 and HMC174MS8E share identical pinout, package dimensions, and electrical specifications. The sole difference is lead finish (Sn/Pb vs. 100% matte Sn) and MSL rating (235 °C vs. 260 °C peak reflow), making them drop-in replacements in assembly - provided reflow profile matches the selected variant.