The SXD-300 from Serenum Space is a Space-Qualified Log Detector designed for RF power monitoring in space, aviation, CubeSats, SmallSats, and drone applications. Operating over an input power range of 50 to 300 mW, this log detector offers a detection sensitivity between 3% and 30%, enabling precise measurement of varying signal amplitudes. It functions with a supply voltage from 2.8 to 5 V and is housed in a surface mount SXD package measuring 35 x 35 x 12 mm, weighing 18 grams. The SXD-300’s logarithmic slope and output voltage characteristics provide reliable conversion of RF input signals into proportional DC output voltages, essential for payload health monitoring, automatic gain control, and fault detection in harsh space environments. Its robust design supports long operational life under radiation exposure, temperature cycling, and vibration, meeting stringent space-grade requirements.