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Leadframe treatment for enhancing adhesion of encapsulant thereto

  • US 8,012,886 B2
  • Filed: 03/07/2007
  • Issued: 09/06/2011
  • Est. Priority Date: 03/07/2007
  • Status: Active Grant
First Claim
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1. A method for treating a leadframe to enhance adhesion of molding compound to the leadframe, the method comprising the steps of:

  • providing the leadframe comprising copper or copper alloy and having a surface;

    immersing the leadframe in a pre-dip comprising a topography modifier and an organic additive but without an oxidizing agent to prepare the leadframe before oxidizing the leadframe in an oxidation treatment bath;

    thenoxidizing the leadframe in the oxidation treatment bath to form copper oxide on the surface of the leadframe;

    thendipping the leadframe in a complexing or chelating agent to enhance the purity of the copper oxide formed; and

    thereaftercleaning the leadframe with an acid to remove contaminants remaining on the leadframe.

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