This paper is related to the study of Latch Up (LU) phenomenon using TCAD simulation. It has been pointed out that latch up is a well-known phenomenon but questions remain about the sensitivity and interaction of different aggressors and victims. A complete silicon study would also consume too much resources as there are too many aggressor/victim combinations possible. The study was conducted in three stages. At first, results from a prior study were reviewed and simulation parameters were adjusted to match as close as possible these results. In addition, all possible aggressor – victim duos were simulated to be able to determine which combination should be protected in terms of LU.