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:
Feb. 15, 2011
Filed:
May. 30, 2008
Applicants:
Chao Wang, Tianjin, CN;
Qing Chun He, Tianjin, CN;
Zhe LI, Tianjin, CN;
Zhijie Wang, Tianjin, CN;
Dehong YE, Tianjin, CN;
Inventors:
Chao Wang, Tianjin, CN;
Qing Chun He, Tianjin, CN;
Zhe Li, Tianjin, CN;
Zhijie Wang, Tianjin, CN;
Dehong Ye, Tianjin, CN;
Assignee:
Freescale Semiconductor, Inc, Austin, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B 15/01 (2006.01); C25D 5/48 (2006.01);
U.S. Cl.
CPC ...
Abstract
A lead frame having a coating of organic compounds on its lead fingers prevents tin and flux from contaminating the lead fingers after die attach. The coating is removed prior to wire bonding. The coating allows for reliable second bonds (bond between wires and lead fingers) to be formed, decreasing the likelihood of non-stick and improving wire peel strength.