System on module total ionizing dose distribution modeling

The paper presents total ionizing dose (TID) distribution due to trapped electrons and protons at the system on module (SOM) surface. TID calculation was made in 3D_SPACE software (Specialized Electronic Systems). The main goal of this paper is a more precise definition of the radiation hardness requirements for space electronics. A huge TID level dispersion for different ICs in SOM is demonstrated. Basic Al sphere approach for TID spacecraft requirements calculations is shown to provide overestimated conservative results.