**HMC637LP5E: A High-Performance 20 GHz SPST Switch for Advanced RF and Microwave Systems**

The relentless drive for higher data rates and more sophisticated signal processing in modern communication, aerospace, and defense systems demands RF components that offer exceptional performance well into the microwave frequency range. The **HMC637LP5E**, a **20 GHz Single-Pole Single-Throw (SPST) absorptive switch**, stands out as a critical solution for these advanced applications, providing engineers with a blend of high isolation, low insertion loss, and remarkable switching speed.

Fabricated on a Gallium Arsenide (GaAs) process, this switch is engineered to operate from DC to an impressive **20 GHz**, making it suitable for a vast array of systems, including test and measurement equipment, microwave radios, and electronic warfare (EW) subsystems. Its **absorptive topology** is a key differentiator. Unlike reflective switches, which can cause signal integrity issues from unwanted energy reflections, the absorptive design presents a stable 50-ohm impedance to the source in both the ON and OFF states. This characteristic is paramount for protecting sensitive components and maintaining signal fidelity in complex multi-component systems.

The performance metrics of the HMC637LP5E are exceptional. It achieves an ultra-low **insertion loss of just 1.2 dB** at 20 GHz, ensuring minimal signal attenuation when the switch is in the conductive path. Conversely, it provides **high isolation of 50 dB** at 10 GHz and 30 dB at 20 GHz, effectively blocking signals when in the OFF state. Furthermore, the switch boasts a remarkably fast switching speed of 5 nanoseconds, enabling rapid signal routing crucial for pulsed and TDD (Time Division Duplex) systems. The device is also equipped with an internal driver, simplifying integration by requiring a single positive voltage control (0/+3V or 0/+5V) and eliminating the need for a negative voltage supply.

Housed in a compact, RoHS-compliant 5x5 mm QFN leadless package, the HMC637LP5E is designed for high-density PCB layouts. Its robust construction ensures high reliability for demanding environments. Whether used for signal routing, pulse modulation, or transmit/receive isolation, this switch delivers the performance needed for next-generation designs.

**ICGOOODFIND:** The HMC637LP5E is a premier **absorptive SPST switch** that sets a high bar for performance in the Ku-band and below. Its outstanding combination of **wide bandwidth (DC-20 GHz)**, **low insertion loss**, **high isolation**, and **integrated driver** makes it an indispensable component for engineers designing cutting-edge RF and microwave systems where signal integrity and reliability are non-negotiable.

**Keywords:** SPST Switch, 20 GHz, Absorptive Switch, Insertion Loss, High Isolation.