ST4019 is an RF termination load (dummy load) designed to absorb incident RF energy with minimal reflection in microwave and millimeter-wave systems. It operates across a frequency range of DC to 40 GHz with a maximum VSWR of 1.35:1 and handles up to 2 Watts of continuous-wave (CW) power, derated linearly to 0.2 W at +125°C. The termination features a 2.92mm male coaxial connector with 50 Ohms impedance and is constructed from passivated stainless steel with gold-plated beryllium copper contacts, operating reliably over a temperature range of -55°C to +125°C. ST4019 is commonly used in wireless systems, satellite communications, radar systems, and test and measurement applications to terminate unused ports on devices such as couplers, circulators, and switches, ensuring signal integrity and preventing potential device damage from reflections.