A coil component includes a support substrate, a coil portion including a first conductive layer being in contact with one surface of the support substrate, and a second conductive layer disposed on the first conductive layer to be spaced apart from the one surface of the support substrate, and a body including the support substrate and the coil portion embedded in the body. One side of the first conductive layer is closer to a center of the second conductive layer in a width direction of the coil portion than one side of the second conductive layer.

A reactor includes a coil having a winding portion, and a magnetic core including a core piece having an inner core portion disposed inside the winding portion. The core piece is a compact made of a composite material that contains a magnetic powder and a resin. The reactor further includes: a first projection that is integrated with and projects from an outer peripheral face of the inner core portion, and comes into contact with an inner peripheral face of the winding portion so as to position the winding portion in a diameter direction of the winding portion, and a second projection that is integrated with and projects from the core piece at a position opposing an end face of the winding portion, and comes into contact with the end face of the winding portion so as to position the winding portion in an axial direction thereof.

An magnetic component structure with thermal conductive filler is provided in the present invention, including an upper magnetic core, a lower magnetic core combining with the upper magnetic core to form a casing with a front opening and a rear opening, and a coil mounted in the casing, where two terminals of the coil extend outwardly from the front opening, and a thermal conductive filler filling between the casing and the coil in the casing.

In a coil component, coupling coefficient is improved. In the coil component, the coupling position between the outer end portion of the first planar coil and the first lead-out portion is biased toward the second lead-out portion with respect to the center line of the first lead-out portion, whereby the length of the second planar coil not alongside with the outermost turn of the first planar coil is shortened. By shortening the length of the second planar coil, the coupling coefficient between the first coil portion and the second coil portion is increased.

In a coil component, heat radiation around a through conductor is improved. In the coil component, since the cross-sectional area of the inner end portion of the planar coil is designed to be relatively large, heat generated in the through conductor is easily transferred to the inner end portion. Since heat is efficiently transferred from the through conductor to the inner end portion, high heat radiation around the through conductor is achieved.

An apparatus for a transformer with an insulating divider includes a primary winding proximate to a primary magnetic core assembly and a secondary winding proximate to a secondary magnetic core assembly. The primary magnetic core assembly and the secondary magnetic core assembly are made of materials with a high magnetic permeability. The apparatus includes a divider placed between the primary and secondary magnetic core assemblies. The divider includes an electrically insulating material. The apparatus includes an electrically insulating potting material surrounding each of the magnetic core assemblies in a vicinity of the divider.

According to one configuration, an inductor device includes a first electrically conductive path; a second electrically conductive path, the first electrically conductive path electrically isolated from the second electrically conductive path; first material, the first material operative to space the first electrically conductive path with respect to the second electrically conductive path; and second material. The second material has a substantially higher magnetic permeability than the first material. An assembly of the first electrically conductive path, the second electrically conductive path, and the first material resides in a core of the second material.

A common mode choke coil is configured in which end portions of first and second wires are connected to first and second terminal electrodes, end portions of third and fourth wires are connected to third and fourth terminal electrodes, and at least a part of each of the first, third, fourth and second wires is wound around a winding core portion to form first, second, third and fourth layers. Also, a common mode choke coil is configured in which end portions of first and second wires are connected to first and second terminal electrodes, end portions of a third wire are connected to third and fourth terminal electrodes, and at least a part of each of the first, third, and second wires is wound around a winding core portion to form first, second, and third layers.

A coil component includes a body having one surface and the other surface opposing each other, and one side surface and the other side surface, respectively connecting the one surface and the other surface to each other and opposing each other in one direction, a wound coil embedded in the body, a lead portion extending from an end of the wound coil to one surface of the body and disposed on the one surface of the body, an insulating layer covering one surface of the body and having an opening exposing a portion of the lead portion and extending in the one direction, and an external electrode disposed in the opening and connected to the lead portion. The insulating layer includes finishing portions respectively disposed on opposing sides of the opening in the one direction.

In a coil component, an uneven structure provided by an insulation layer and a resin wall contributes to extension of a contact area with respect to a magnetic body, so that an adhesive force with respect to the magnetic body is improved. In addition, the magnetic body protrudes downward toward an exposed region of the resin wall corresponding to a recessed portion in the uneven structure, a volume thereof is increased, and coil characteristics such as an inductance value are improved.