These diodes have been designed for harsh environment space applications such as inner Solar System exploration probes. More specifically these diodes are being tested to be the blocking diodes of the solar panels for the Bepi Colombo mission.
During the Evaluation phase, components/technologies can be expensively characterized and margins determined. If the evaluation is successful we can then proceed with Qualification, on components produced strictly as defined in the final PID (Process Identification Document) and from a given lot (actually, the first production lot). Once qualified, the component is listed in the QPL (Qualified Part List).
Environmental testing provides a useful tool for evaluation, qualification and screening of EEE components for high-reliability applications. Various types of stresses can be applied to the products in a controlled manner thus allowing to accelerate the appearance of latent defects and consequently to assess the ability of the products to meet project requirements
Humidity may affect the life expectancy of a component by creating stresses on the part materials and altering its electrical properties in a way that the component reliability is significantly diminished. Temperature Humidity Test is those performed with the aim of evaluating the properties of materials used in components and the reliability of non-hermetic packaged devices in humid environments.