Analog Devices Inc. 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 0/8 V control, and operates with single positive supply (3–10 V). Its reflective OFF-state design and CMOS/TTL-compatible control make it suitable for LNA protection and cellular/3G transceiver paths.

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 bias, MSOP-8 package footprint, reflective OFF-state behavior, and compatibility with 3–8 V logic-level control inputs.

Technical Context

The HMC174MS8 implements a GaAs-based monolithic SPDT T/R switch architecture with integrated bias control circuitry enabling single-supply operation. It uses reflective switching: RF1 and RF2 present short-circuit terminations when OFF, while RFC remains active during signal path selection.

Control logic follows a two-input truth table (A/B pins) with ±0.2 V tolerance, supporting 3–10 V Vdd and compatible with HC/HCT logic families. Switching speed is characterized by 10 ns tRISE/tFALL and 24 ns tON/tOFF across DC–3 GHz.

Key Specifications

Pinout & Package

Package: MSOP-8 (14.8 mm²), low-stress injection-molded plastic, Sn/Pb lead finish, MSL1 rated. All ground pins (6, 7) must be soldered directly to PCB RF ground plane; RFC, RF1, and 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 QM11036 and SKY13370-374LF, the HMC174MS8 offers superior third-order intercept (+60 dBm) and wider supply flexibility (3–10 V), making it optimal for high-dynamic-range infrastructure and automotive applications where RF robustness outweighs footprint minimization.

Availability

HMC174MS8 is available at Aetrix Electronics and suitable for infrastructure & repeaters, cellular/3G base stations, and LNA protection applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

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 maintains its high-frequency RF portfolio, specializing in GaAs, GaN, and SiGe MMIC solutions for defense, communications, and test equipment.

The HMC174MS8 belongs to Hittite's legacy GaAs SPDT T/R switch product line, engineered for high-linearity, wideband RF front-end signal routing in wireless infrastructure and portable transceivers.

FAQ

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

The HMC174MS8 delivers 36 dBm input P1dB across 0.5–3.0 GHz when biased at 8 V. At lower Vdd (e.g., 5 V), P1dB drops to 32 dBm. These values are measured under 50 Ω conditions with matched ports and reflect actual large-signal compression thresholds used in repeater and base station front-end design. The HMC174MS8 must be operated within these limits to avoid gain compression and harmonic generation.

Does the HMC174MS8 require external termination resistors on RF1 and RF2 when OFF?

No. The HMC174MS8 presents reflective shorts at RF1 and RF2 when those paths are OFF, eliminating the need for external 50 Ω termination resistors. This internal termination simplifies PCB layout and reduces component count in space-constrained RF modules. The RFC port remains active during switching, and all RF ports are DC-coupled - external DC-blocking capacitors remain mandatory.

Can the HMC174MS8 operate with 1.8 V logic control inputs?

No. The HMC174MS8 requires control voltages referenced to Vdd, with valid logic states defined as 0 V and Vdd (±0.2 V tolerance). Its minimum Vdd is 3 V, so 1.8 V logic cannot directly drive A/B pins. To interface with 1.8 V controllers, level-shifting circuitry or a compatible 3.3 V logic family (e.g., 74LVC) must be used. The HMC174MS8 does not support independent low-voltage control signaling.

What is the thermal resistance (θ_JA) of the HMC174MS8 in its MSOP-8 package?

The HMC174MS8 datasheet does not specify θ_JA explicitly. However, its MSOP-8 package features exposed ground leads (pins 6 and 7) that must be soldered to a solid PCB ground plane to achieve effective thermal dissipation. Under recommended layout - including thermal vias and copper pour - the device sustains continuous RF power up to its P1dB rating across −40 °C to +85 °C ambient without derating, as verified in Hittite's application notes and evaluation board testing.

Is the HMC174MS8 pin-compatible with the HMC174MS8E variant?

Yes. The HMC174MS8 and HMC174MS8E share identical pinout, electrical specifications, and mechanical dimensions. The sole difference is RoHS compliance: HMC174MS8E uses 100% matte tin lead finish and has MSL1 reflow rating up to 260 °C, whereas HMC174MS8 uses Sn/Pb finish and 235 °C reflow limit. Both variants use the same H174 package marking and are functionally interchangeable in existing designs.