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The requirements of the link between different applications in the automotive area have been increasing rapidly during the last years. Especially the reliability of the electric/optical interface device for MOST® (Media Oriented System Transport) applications, FOT (fiber optical transceiver), is very important and of concern. The compliance of the required specification (for electrical or optical parameters in the entire environment) is proven by an unique and innovative procedure for automotive components. For the FOT this means also a specific and dedicated qualification procedure to evaluate the portion of the optical data transfer. Today's qualification procedures for semiconductor devices consider electrical and assembly (package) related parameters. The special optical part of the FOT (LED and photodiode) and the accompanying circuits represent a new class of parameters that have to be qualified.