A Starting Point for Selecting EMI Filters (Download)
Electromagnetic interference (EMI) is a hazard that most electronic devices and systems must be protected from. EMI can be caused by everything from switch-mode power supplies (SMPS) and electric motors in industrial equipment to lightning, which can cause severe EMI. It also has coupling mechanisms, which means that it can be transferred from a source to a receiver through radiation, conduction, or inductive or capacitive coupling.
Many engineers use grounding or shielding to prevent EMI in the form of electromagnetic radiation or induction from disrupting electrical and electronic circuits. However, EMI suppression filters are one of the most widely used solutions for limiting EMI before it drags on the performance of the system or causes it to malfunction. EMI filters feature a wide range of configurations, capabilities, materials, footprints, and price points.