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.

An LC filter arrangement includes a filter capacitor that connects the first output terminal to the second output terminal, a magnetic core, and a choke having a plurality of turns surrounding the magnetic core, and a first choke terminal and a second choke terminal. Each of the turns is formed by a separate conductor segment, at least partially surrounding the magnetic core. The LC filter arrangement is mounted on a circuit board and is electrically connected to a conductor track of the circuit board.

A coil component includes a core that includes a core part having a first end portion and a second end portion; and a first wire and a second wire that are wound around the core part from the first end portion to the second end portion in substantially helical shapes so as to have substantially the same number of turns. The first wire is wound so as to form a first layer that contacts the peripheral surface of the core part, the second wire is wound such that at least part of the second wire forms a second layer on the outside of the first layer, and a first coil length formed by the first wire is longer than a second coil length formed by the second wire.

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.

Bonding strength between a core and a top plate is increased in a coil component. Surface roughnesses of a top surface of a flange portion of the core and a lower main surface of the top plate are different. For example, the surface roughness of the lower main surface is smaller than the surface roughness of the top surface. A protrusion protruding from the lower main surface having smaller surface roughness and in contact with the top surface of the flange portion of the core is in a region where the lower main surface of the top plate and the top surface of the flange portion of the core face each other with an adhesive interposed therebetween. The protrusion can increase a surface area of a bonding surface of the top plate having smaller surface roughness, and provide an anchor effect of the adhesive on the top plate.

A device includes a core having a first end and a second end, and first and second wires wound around the core, where the core has first, second, and third sections, the second section being arranged between the first and third sections. Each of the first and second wires includes an i.sup.th turn located on the first section, a j.sup.th turn located on the second section, and a k.sup.th turn located on the third section. The i.sup.th turn of the first wire is closer to the first end than the i.sup.th turn of the second wire, the j.sup.th turn of the first wire is closer to the second end than the j.sup.th turn of the second wire, and the k.sup.th turn of the first wire is closer to the first end than the k.sup.th turn of the second wire.

A radio frequency (RF) weak magnetic field detection sensor includes a ferromagnetic core, a pickup coil disposed to surround the ferromagnetic core, a substrate that includes an opening, a core pad connected to the ferromagnetic core and a coil pad connected to the pickup coil, and an insulating tube interposed between the ferromagnetic core and the pickup coil. The insulating tube includes a bobbin around which the pickup coil is wound, and a core hole formed to pass through the bobbin and configured to accommodate the ferromagnetic core.

The invention relates to a housing (20) for electrically isolating and mechanically stabilizing a plug-in coil element (10), wherein the plug-in coil element (10) has a coil (13) having a winding body (30), a first coil end (15) and a second coil end (16), as well as a first connecting element (11) for electrically connecting to a connecting element along a plug-in direction (S), and a second connecting element (12) for electrically connecting along the plug-in direction (S), wherein the winding body (30) has a first winding body end (31) and a second winding body end (32), and the first coil end (15) is formed to be spaced from the first winding body end (31), and the second coil end (16) is formed to be spaced from the second winding body end (32), wherein the first connecting element (11) is connected to the first coil end (15), and the second connecting element (12) is connected to the second coil end (16), moreover having protruding from a housing opening (39) to the outside, a sheathing portion (21) surrounding the first connecting element (11) at least in portions, a first housing portion (22) surrounding the second connecting element (12) at least in portions, a guiding device (23) arranged at an outer surface of the housing (20) for guiding the housing (20) during an assembly in parallel to the plug-in direction (S), and an arresting device (24) arranged at the outer surface for arresting the housing (20) in parallel to the plug-in direction (S).

A coil component comprising a core including a winding core having a shape extending in a constant direction, a first flange disposed at a first end in an extending direction of the winding core, and a second flange disposed at a second end in the extending direction of the winding core; first and second electrodes disposed on the first flange; third and fourth electrodes disposed on the second flange; and a coil including a first wire wound around the winding core and electrically connected to the first and third electrodes, and a second wire electrically connected to the second and fourth electrodes. The first and second flanges each have an inner surface facing the winding core, an outer surface facing toward the side opposite to the inner surface, a lower surface connecting the inner and outer surfaces, and an upper surface facing the side opposite to the lower surface.

A coil component includes a core including a winding core portion and flange portions; wires wound around the winding core portion; and terminal electrodes on the respective flange portions. The wires respectively have flattened portions connected to the terminal electrodes. The flattened portions each have a shape that becomes thinner from the winding core portion toward a tip end of a corresponding one of the wires. When viewed from a side where mounting surfaces are located, a center axis of a part of each of the flattened portions closer to the winding core portion and a center axis of a part of a corresponding one of the flattened portions closer to the tip end extend in different directions. The center axis of the part of each of the flattened portions closer to the tip end extends in a direction parallel to an axial direction.