DC-DC Converters, RF Circuits, High-Speed Data Transmission, Power Amplifiers, LED Lighting, Aerospace and Defense, Renewable Energy Systems. Planar transformers and inductors find applications in a wide range of electronic devices and systems where compact size, high performance, and efficient power management are essential. Here are some common applications of planar transformers and inductors: Planar Transformers, Power Supplies, Telecommunications Equipment, Electric Vehicles (EVs).