Analog Devices Inc. 105672-HMC427LP3

Overview

The 105672-HMC427LP3 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC positive-control transfer switch in a 3×3 mm leadless SMT package, operating from DC to 8 GHz with 1.2 dB typical insertion loss at 6 GHz, 40–45 dB isolation through 6 GHz, and dual 0/+5 V control logic for RF path selection between four ports - ideal for broadband microwave signal routing in test instrumentation and telecom infrastructure.

For engineers reviewing the 105672-HMC427LP3 datasheet, 105672-HMC427LP3 pinout, 105672-HMC427LP3 application, or 105672-HMC427LP3 equivalent, key selection criteria include its non-reflective architecture, +5 V bias requirement (<20 μA), 2 ns rise/fall time, and need for external DC blocking capacitors at all four RF ports to define low-frequency cutoff.

Technical Context

This transfer switch implements a single-pole double-throw (SPDT) topology per path pair (RF1↔RF3 and RF2↔RF4), controlled by two independent CMOS-compatible inputs (CTRLA/CTRLB), enabling four distinct RF path states: RF4→RF2 & RF1→RF3, or RF4→RF1 & RF2→RF3. It uses GaAs pHEMT technology for broadband performance and requires fixed +5 V bias applied to VDD (Pin 15).

The device operates in a non-reflective configuration with internal 50 Ω terminations when off, ensuring minimal impedance mismatch across all states. All RF ports are DC-coupled but mandate external blocking capacitors - their values directly set the lower frequency limit of operation, as no on-chip DC blocking is integrated.

Key Specifications

Pinout & Package

Package: 3 × 3 mm, 16-pin leadless surface-mount (exposed paddle), MSL1, Sn/Pb finish (HMC427LP3); RoHS-compliant matte Sn version also available (HMC427LP3E). Exposed ground paddle must be soldered to PCB RF ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC344LP3 and QM11036, the 105672-HMC427LP3 offers the best balance of low insertion loss (1.2 dB), high isolation (40–45 dB), and proven reliability in DC–8 GHz infrastructure applications - making it optimal for precision test and high-performance telecom where signal integrity is prioritized over extreme miniaturization or ultra-high-frequency extension.

Availability

The 105672-HMC427LP3 is available at Aetrix Electronics and suitable for test instrumentation, fiber optics & broadband telecom, and basestation infrastructure requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for 105672-HMC427LP3 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. (including former Hittite Microwave) is a global leader in high-performance analog, RF, and mixed-signal semiconductors, serving aerospace, defense, communications, and industrial markets with precision signal processing solutions.

The 105672-HMC427LP3 belongs to Analog Devices' GaAs MMIC switch portfolio, engineered specifically for broadband microwave signal routing in demanding RF infrastructure where low loss, high isolation, and fast switching are essential.

FAQ

What is the minimum operating frequency of the 105672-HMC427LP3?

The 105672-HMC427LP3 operates from DC, but its low-frequency limit is determined by external DC blocking capacitors placed at RF1, RF2, RF3, and RF4. Capacitor value selection sets the cutoff - for example, a 100 pF capacitor yields ~16 MHz lower limit in a 50 Ω system. The 105672-HMC427LP3 itself imposes no intrinsic lower bound beyond this passive constraint.

Does the 105672-HMC427LP3 require external biasing components?

Yes - the 105672-HMC427LP3 requires a +5 V ±10% supply to Pin 15 (VDD) and must be decoupled with a local ceramic capacitor (e.g., 100 nF) close to the pin. No external resistors or active bias networks are needed, as the device draws <20 μA quiescent current and integrates internal bias circuitry.

Can the 105672-HMC427LP3 be used in reflective (series-shunt) configurations?

No - the 105672-HMC427LP3 is strictly a non-reflective (shunt-terminated) transfer switch. Its internal 50 Ω terminations on inactive paths ensure consistent 50 Ω impedance regardless of state, eliminating the need for external shunt resistors or matching networks required by reflective SPDT switches.

What is the ESD sensitivity rating of the 105672-HMC427LP3?

The 105672-HMC427LP3 is rated ESD Class 1A per HBM (Human Body Model), meaning it withstands up to 250 V. This mandates strict handling precautions - including grounded workstations, ionized air, and ESD-safe packaging - especially during PCB assembly and probe testing.

How does temperature affect insertion loss in the 105672-HMC427LP3?

Insertion loss of the 105672-HMC427LP3 increases slightly with temperature: typical data shows +0.1 to +0.2 dB degradation from +25 °C to +85 °C across 1–6 GHz. This drift is monotonic and well-characterized, allowing predictable system-level margin allocation in thermal design.