page_title: Transformer types
section_title: Planar transformer
hierarchical_section_title: Transformer types / Power transformer / Ferrite core / Planar transformer
caption_attribution_description: a planar inductor constituted by a spiral track on a printed circuit board and a planar magnetic core
context_page_description: A variety of types of electrical transformer are made for different purposes. Despite their design differences, the various types employ the same basic principle as discovered in 1831 by Michael Faraday, and share several key functional parts.
context_section_description: Manufacturers either use flat copper sheets or etch spiral patterns on a printed circuit board to form the "windings" of a planar transformer, replacing the turns of wire used to make other types. Some planar transformers are commercially sold as discrete components, other planar transformers are etched directly into the main printed circuit board and only need a ferrite core to be attached over the PCB. A planar transformer can be thinner than other transformers, which is useful for low-profile applications or when several printed circuit boards are stacked. Almost all planar transformers use a ferrite planar core.
caption: A planar transformer
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