Surface mountable electronic component

• US 6,717,500 B2
• Filed: 04/24/2002
• Issued: 04/06/2004
• Est. Priority Date: 04/26/2001
• Status: Expired due to Fees

• Current Assignee: Coilcraft Incorporated
• Original Assignee: Coilcraft Incorporated
• Inventors: Hess, Scott, Girbachi, Catalin Constantin, Rehak, Richard D., Garcia, Nelson, Caramela, Chris
• Primary Examiner(s): MAI, ANH T
• Application Number:
  US10/131,344
• Publication Number:
  US 20020164892A1
• Time in Patent Office: 713 Days
• Field of Search: 336/212, 336/83, 336/200, 336/223, 336/198, 336/208, 336/232
• US Class Current: 336/83
• CPC Class Codes: H01F 17/04 with magnetic core
• CPC Class Codes: H01F 17/045 with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
• CPC Class Codes: H01F 27/292 Surface mounted devices

Abstract

A low profile electronic component in accordance with the invention includes an elongated core made from a magnetic material such as ferrite, which is connected to a base having a plurality of metalized pads attached thereto for electrically and mechanically connecting the component to a printed circuit board. Support structures or spacers are positioned at the ends of the core and are provided to assist the core in shielding the component and concentrating its magnetic lines of flux. The component also includes a winding of wire wound about at least a portion of the base and core assembly between the supports, and has the ends of the wire electrically and mechanically connected to the metalized pads of the base. A top portion may be coupled to the core via the supports to cover at least a portion of the windings of wire of the component. The supports separate the core and the top portion and maintain the top portion at a desired position with respect to the winding and the core. The core, supports, and top portion provide a source of additional shielding for the component and improve the performance of the overall component by concentrating the lines of flux emitted by the component thereby increasing the flux density of the component and its inductance.

Claims

1. A surface mountable electronic component comprising:

an elongated core of magnetic material having first and second ends;

a base of heat tolerant material supporting the core and having metalized pads located on a surface thereof for electrically connecting the base to a printed circuit board;

a winding of wire wound about at least a portion of the base and core, the winding of wire having ends electrically connected to the metalized pads of the base; and

spacers of magnetic material extending from the ends of the core and having at least a portion of the winding of wire wound therebetween.

2. A component according to claim 1, wherein the base comprises a ceramic structure having at least six metalized pads located on a bottom surface thereof.

3. A component according to claim 2 comprising:

a shielding structure of magnetic material coupled to the spacers and covering at least a portion of the winding of wire.

4. A component according to claim 1, wherein at least a portion of the spacers comprise insulative material used to isolate the core from the shielding structure.

5. A surface mountable electronic component comprising:

an elongated core of magnetic material;

a base of heat tolerant material supporting the core and having metalized pads located on a surface thereof for electrically connecting the base to a printed circuit board;

a winding of wire wound about at least a portion of the base and core, the winding of wire having ends electrically connected to the metalized pads of the base;

a shielding structure of magnetic material covering at least a portion of the winding of wire; and

spacers for spacing the shielding structure with respect to the coil and core.

6. A component according to claim 5, wherein the spacers are integral to the core forming a C-shaped assembly of magnetic material capable of concentrating lines of flux emitted from the component in order to increase flux density and inductance of the component.

7. A component according to claim 5, wherein the base comprises a C-shaped ceramic to which the metalized pads can be connected for electrically connecting the ends of the wire to the component and for electrically connecting the component to the printed circuit board.

8. A component according to claim 5, wherein the shielding structure comprises a generally rectangular shaped slab made from magnetic material capable of increasing flux density and inductance of the component.

9. A component according to claim 5, wherein the shielding structure comprises a cover made from a magnetic material and having a flat top surface with walls extending downward therefrom which serves to further increase flux density and inductance of the component.

10. A component according to claim 5, wherein the spacers are integral to the shielding structure forming a C-shaped assembly of magnetic material capable of concentrating lines of flux emitted from the component in order to increase flux density and inductance of the component.

11. A component according to claim 5, wherein at least a portion of the spacers comprise insulative material used to isolate the core from the shielding structure.

12. A component according to claim 5, wherein the spacers comprise a means for spacing the shielding structure with respect to the core.

13. A surface mountable electronic component having a base with a plurality of metalized pads arranged so that the component can be wired in a plurality of different component configurations comprising:

an elongated core of magnetic material;

a ceramic base coupled to the core and having a plurality of metalized pads for electrically connecting the base to a printed circuit board and for allowing the component to be wired in a plurality of different configurations, wherein the plurality of metalized pads comprises at least six pads and the plurality of different configurations comprise one of a single wire winding configuration, a double wire winding configuration and a triple wire winding configuration; and

a winding of wire wound about at least a portion of the base and core, wherein the wire has ends which can be electrically connected to the metalized pads of the base.

14. A component according to claim 13, further comprising:

a shielding structure of magnetic material coupled to the core and covering at least a portion of the winding in order to concentrate magnetic lines of flux emitted from the component and increase flux density and inductance of the component.

15. A component according to claim 14, wherein the shielding structure comprises a generally rectangular shaped slab capable of increasing flux density and inductance of the component.

16. A component according to claim 14, wherein the shielding structure comprises a cover having a flat top surface with outer walls extending downward therefrom which serve to increase flux density and inductance of the component.