**The HMC547LP3E: A High-Performance SP4T Reflective Switch for RF and Microwave Applications**

In the demanding world of RF and microwave design, the selection of switching components is critical to system performance. The **HMC547LP3E** stands out as a premier solution, a **Single-Pole Four-Throw (SP4T)** reflective switch engineered to meet the rigorous requirements of modern wireless infrastructure, test and measurement equipment, and aerospace and defense systems.

Fabricated on a **Gallium Arsenide (GaAs)** process, this switch covers an exceptionally broad frequency range from **DC to 20 GHz**, making it a versatile choice for numerous applications. Its core function is to route high-frequency signals from one common port to any of four selected paths with minimal loss and high isolation.

A key performance metric for any switch is **insertion loss**, and the HMC547LP3E excels with a remarkably low typical value of **0.8 dB at 10 GHz** and only **1.2 dB at 20 GHz**. This ensures maximum signal power is preserved, which is crucial for maintaining system dynamic range and signal integrity. Conversely, its **isolation** is outstanding, typically measuring **45 dB at 10 GHz** and **35 dB at 20 GHz**. This high isolation prevents unwanted signal leakage between the inactive paths, which is vital for preventing crosstalk and maintaining channel integrity in multi-antenna or multi-path systems.

The switch operates with a **positive control voltage** ranging from +3V to +5V, simplifying integration with modern digital controllers and FPGAs. It features very fast switching speeds, with a **rise/fall time of approximately 6 ns** and a switching time (TTL) of 10 ns, enabling its use in fast-hopping and time-division multiplexing systems.

Housed in a compact, RoHS-compliant **4x4 mm LP3 leadless package**, the HMC547LP3E is designed for robust surface-mount assembly. Its reflective design means it terminates all unused ports to ground, which simplifies system design by eliminating the need for external terminating resistors on unused arms.

**ICGOOODFIND:** The HMC547LP3E is a high-performance, broadband SP4T reflective switch that delivers an exceptional combination of **low insertion loss, high isolation, and fast switching speed** across a wide frequency spectrum. Its GaAs design and positive voltage control make it an ideal and efficient component for enhancing signal routing capabilities in sophisticated RF and microwave systems.

**Keywords:** SP4T Reflective Switch, Broadband DC to 20 GHz, Low Insertion Loss, High Isolation, GaAs MMIC.