A system component of a control device, especially for a transmission or engine controller of a motor vehicle, is provided as a closed system component for a control device which can be transported, thereby allowing decentralized manufacturing of the system component. The system component has a hybrid circuit, equipped with electronic components, which is embedded in a printed circuit board, recessed in the center, in such a manner that the hybrid circuit is completely enclosed by the printed circuit board. The hybrid circuit and the printed circuit board are mounted on a base element and connected to each other via contact elements. A cover element is positioned on top of the hybrid circuit and the contact elements in such a manner that the hybrid circuit is fully encapsulated by the base element, the cover element and the printed circuit board from environmental influences. The inventive system component, and integrated systems comprising the same, are especially suitable for use in motor vehicles, for example transmission and engine controllers.