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Surface mountable electronic device

  • US 4,801,912 A
  • Filed: 06/07/1985
  • Issued: 01/31/1989
  • Est. Priority Date: 06/07/1985
  • Status: Expired due to Term
First Claim
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1. A surface mountable electronic device comprising:

  • (a) a discrete electronic device comprising a body having opposite ends and a pair of spaced apart leads extending out from said ends of said body in generally opposite directions and substantially along a common axis, said discrete device comprising an inductor including a core and a winding on said core and electrically connected to said leads;

    (b) an elongated rectangular solid body of electrical insulating material encapsulating said discrete device body and said leads, said body of insulating material having first and second ends facing and spaced from said ends of said discrete device body and parallel, planar mounting surfaces extending between said first and second ends, said leads terminating adjacent said first and second ends;

    (c) first and second electrode means on said first and second ends of said body of insulating material, respectively, each of said electrode means including an end portion on the corresponding end of said body of insulating material and in electrical contact with the corresponding one of said leads, each of said electrode means further including a pair of planar contact portions each one extending along a corresponding one of said mounting surfaces for making electrical connection to a circuit having a portion defined on a surface to which said electronic device is mountable in a mechanically stable manner;

    (d) said end portion of said electrode means having a surface area less than the surface area of the end of said body of insulating material on which said electrode end portion is located, said electrode end portion being elongated in shape having a length extending between said mounting surfaces and having a width, said electrode end portion extending from the termination of the corresponding one of said leads along said end of said body of insulating material to the junction of said end and said mounting surface of said body of insulating material, and said end portion having a common area substantially no less than the cross-sectional area of the wire of said inductor winding so that the occurrence of hot spots is prevented in a manner maximizing Q of said inductor and minimizing any reduction in the inductance thereof; and

    (e) said planar contact portion of said electrode means being elongated rectangular in shape having a length greater than the width thereof, said length of said contact portion being greater than said width of said electrode end portion.

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