Abstract This paper elucidates the role of the electronic component engineer in ensuring the reliability of electronic components for high reliability spacecraft applications. The reliability of electronic components is categorized in three areas of responsibility, attributable to the component manufacturer, the user and a shared responsibility between the two. The broad scope of the component engineer's responsibility extends from circuit design to system operation. Co‐operation with circuit design engineers for proper part application is emphasized, and the requirements for understanding the effects of environmental stresses on device material properties is treated. The importance of a close working relationship between the component engineer and the part supplier is also emphasized.