Founded in 1945 and headquartered in Cary, Illinois, Coilcraft is a leader in the design, manufacture, and distribution of high-performance magnetic components. It primarily produces RF chip inductors, power magnetics, and filters. Ceramic Resonators Common Mode Filters EMI/RFI Filters (LC, RC Networks) Ferrite Beads Audio Transformers Color Ring Inductors / Through Hole Inductors Inductors (SMD) Power Inductors Power Transformers Pulse Transformers(LAN) RF Directional Coupler