1. The problem statement, all variables and given/known data I'm currently doing a project involving the build of a switching circuit for an SRM. I have to choose a variety of components for each stage of the build. For example, I chose an open collector for the interface device, an optocoupler for the isolation device and an IGBT for the switching device. I have to compare different components and then justify why I picked the one over the other. 3. The attempt at a solution Each component I picked would be suitable for the application so how do I justify choosing one over the other? Is there anything I should look for in data sheets that give some components an advantage over the other?