The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 04, 2008
Filed:
Apr. 26, 2005
Jong Sik Paek, Seoul, KR;
Sung Su Park, Seoul, KR;
Seong Min Seo, Seoul, KR;
Amkor Technology, Inc., Chandler, AZ (US);
Abstract
Disclosed are a wafer level chip scale package and a method for manufacturing the same. An RDL is formed on a semiconductor die through a sputtering process, and a UBM is formed on the RDL through an electroplating process by using the RDL as a seed layer. Thus, the RDL sputtering, UBM electroplating, RDL etching and leakage descum processes are carried out only one time, thereby simplifying the structure and manufacturing processes of the package. Since a copper layer of the RDL is formed with a relatively large thickness through the sputtering process, current density is uniformly distributed during the electroplating process, so it is possible to uniformly form the thickness of the UBM by using pure nickel.