Coilcraft, Inc. published an operating voltage ratings paper discussing how higher voltage semiconductor devices have created a new emphasis on operating voltage in inductor selection.

Our privately held company was founded in 1945 as a custom coil maker for the radio manufacturers clustered around the Chicago area. Today we produce inductors for a long list of customers in telecommunications, computers, instrumentation and consumer electronics. Many are standard, off-the-shelf products. But we also provide custom components designed to meet customers'​ specific requirements. Our basic product lines include: Surface mount RF inductors Surface mount power inductors Tunable and fixed RF inductors EMI filters LED driver magnetics Coilcraft's worldwide headquarters are in Cary, Illinois, 30 miles northwest of Chicago's O'Hare Airport. European headquarters are located in Cumbernauld, Scotland, near Glasgow. Production centers are strategically positioned throughout the world. Our diversity of locations offers several advantages to our customers. Engineering prototypes are shipped in a matter of days. Our domestic plants can quickly provide your pilot run requirements. And then full scale production can be done at an appropriate offshore plant for maximum economy and convenience to your own facilities. Manufacturing capabilities are duplicated at several locations, assuring you a steady supply of components.