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Uprating in the Development of a 250C Avionics Control System
Keywords: uprating, control systems, components
Many control systems are increasingly required to operate outside of the traditional temperature limits of -55°C to 125°C. Thermal uprating of components is a method for assessing the ability of parts to achieve the functionality and performance requirements of an application at temperatures outside the manufacturers’ specified operating range. For many applications of uprating in the past, it was possible to decouple the uprating process from assessments of the manufacturability, material selection and reliability of the parts and keep the focus of uprating only on the electrical performance of parts. However, when the temperature limits go close to or beyond the limiting operating temperatures of common packaging and attachment materials – this separation of tasks is becoming impractical. In this paper we describe the concurrent process of design of test structures, selection of manufacturing processes for electronic parts and uprating. We will show determination of the physical limits of several passive and discrete parts, selection of the materials and processing methods, and the methods of uprating of the parts for a specific candidate control system.
Diganta Das, Research Scientist
University of Maryland, College Park
College Park, MD
USA


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