—This paper presents the definition of an integrated processor core ASIC named SCOC3 which is designed for space computers. It also presents the validation method that has led to a successful ASIC run at the first time, thanks to Astrium’s improved control in microelectronic component design. It is base on the LEON3FT Sparc processor associated to a Floating Point Unit both from Aeroflex Gaisler. The core provides many interfaces to connect various types of electronic units. This ASIC is one of the first applications implemented on the new ATC018RHA ATMEL technology. Keywords-space,computer, processor, component ASIC, development, process, validation