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COTS (CommercialOff-The-She@ electronic components are attractive for space applications. However, computer designers will need to solve a main problem as regard their SEE (Single Event Effect) sensitivity. The purpose of fault tolerance studies conducted at CNES (the French Space Agency) is to prepare the space community for the signijkant evolution linked to the usage of COTS components. CNES has patented two fault-tolerant architectures with low recurring costs, mass and power consumption, as compared to conventional architectures as e.g. the TMR (Triple Modular Redundancy) one. The former, referred to as D M , is time redundancy based and minimises recurring costs. It is mainly intended for but not limited to scientific missions. The latter, referred to as DTZ, is based on a structural duplex architecture with minimum duplication and is suited for high-end application missions.

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