Analog Devices Inc. 101675-HMC545

Overview

101675-HMC545 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SPDT RF switch designed for DC–3 GHz signal routing in RF front-ends. It delivers 0.25 dB typical insertion loss at 1 GHz, +65 dBm input IP3 at 0/+5 V control, and operates with positive CMOS/TTL-compatible control voltages (0/+3 V to 0/+8 V) in an ultra-small SOT26 package. It is used in cellular/3G infrastructure and WLAN IF/RF switching paths.

For engineers reviewing the 101675-HMC545 datasheet, 101675-HMC545 pinout, 101675-HMC545 application, or 101675-HMC545 equivalent, key selection criteria include insertion loss vs. frequency, isolation between RF1/RF2 and RFC, control voltage compatibility, thermal resistance (282 °C/W), and ESD sensitivity (HBM Class 1A).

Technical Context

The 101675-HMC545 implements a reflective GaAs MMIC architecture where RF1 and RF2 present reflective shorts when "Off", enabling compact design without external termination resistors. Its dual-control logic (pins A and B) supports standard truth-table operation for RFC-to-RF1 or RFC-to-RF2 path selection.

It requires DC blocking capacitors on all three RF ports (RFC, RF1, RF2) and mandates direct soldering of ground pins (1, 3, 5) to PCB RF ground. Thermal management relies on its 282 °C/W junction-to-ambient thermal resistance and 0.23 W continuous power dissipation rating at 85 °C.

Key Specifications

Pinout & Package

Package: SOT26 - 6-lead plastic surface-mount package with exposed paddle; RoHS-compliant version (HMC545E) uses 100% matte Sn lead finish and MSL1 rating (260 °C peak reflow).

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 101675-HMC545 offers superior broadband performance (DC–3 GHz), lowest insertion loss (0.25 dB), and widest control voltage range (0/+3 V to 0/+8 V), making it optimal for infrastructure-grade RF routing where signal integrity and logic flexibility are critical.

Availability

101675-HMC545 is available at Aetrix Electronics and suitable for cellular infrastructure, WLAN front-ends, and automotive telematics requiring stable component supply across extended temperature ranges and high-reliability RF performance.

Supply support for 101675-HMC545 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, formed through the acquisition of Hittite Microwave in 2014.

The 101675-HMC545 belongs to the Hittite legacy GaAs MMIC SPDT switch product line, engineered for high-linearity, low-loss RF signal routing in wireless infrastructure and test equipment where DC coupling and wideband operation are essential.

FAQ

What is the maximum RF input power the 101675-HMC545 can handle without damage?

The 101675-HMC545 has an absolute maximum RF input power rating of +34 dBm when control voltage is set to 0/+8 V. At this condition, its hot-switch power level is +32 dBm. Exceeding these values risks permanent degradation of the GaAs MMIC die. Derating is required above +85 °C ambient per its 3.5 mW/°C thermal derating curve. Always verify power handling in final layout with proper grounding and thermal vias.

Does the 101675-HMC545 require external DC blocking capacitors?

Yes, the 101675-HMC545 requires external DC blocking capacitors on all three RF ports (RFC, RF1, RF2), as confirmed in its application notes and pin descriptions. The device is DC-coupled internally, and absence of blocking capacitors will cause DC bias conflicts in typical 50 Ω RF systems. Capacitor value determines the low-frequency cutoff - e.g., 330 pF yields ~10 MHz lower limit with 50 Ω impedance.

What is the truth table behavior of control pins A and B on the 101675-HMC545?

Per the datasheet truth table, when pin A is Low and pin B is High, the 101675-HMC545 connects RFC to RF1; when A is High and B is Low, it connects RFC to RF2. Both pins Low or both High place both RF paths in reflective Off-state. This dual-control logic eliminates need for inverters and supports direct CMOS/TTL interfacing without additional logic gates.

Can the 101675-HMC545 operate with 0/+1.8 V control logic?

No, the 101675-HMC545 does not support 0/+1.8 V control. Its specified control voltage range is 0 to +0.2 V for Low and +3 V to +8 V for High states. A +1.8 V high-level signal falls outside the guaranteed recognition window and may result in undefined switching behavior or increased current draw. For 1.8 V systems, level-shifting circuitry or alternative switches like SKY13370-374LF are required.

Is the 101675-HMC545 pin-compatible with the HMC545E variant?

Yes, the 101675-HMC545 and HMC545E share identical pinout, footprint, and electrical functionality. The HMC545E is the RoHS-compliant version with matte tin lead finish and higher MSL1 reflow tolerance (260 °C vs. 235 °C). No PCB layout changes are needed when substituting HMC545E for 101675-HMC545 in new designs or for compliance-driven replacements.