Single Coil Unshielded Power Inductors Würth Elektronik offers a variety of single coil unshielded inductors. These inductors are available in wirewound, high frequency, SMT, and radial through-hole versions. Würth Elektronik Single Coil Unshielded Power Inductors are often used in DC/DC converters as well as in RF/HF circuits, filter applications, EMI and power supply filters, and signal filtering.