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:
Oct. 21, 2003
Filed:
Nov. 28, 2001
Rama R. Goruganthu, Austin, TX (US);
Richard W. Johnson, Cedar Creek, TX (US);
Rosalinda M. Ring, Leominster, MA (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
An integrated circuit die coupled to a package substrate and having circuitry in a circuit side opposite a back side is etched in a manner that inhibits the erosion of underfill material that is used around the periphery of the die and between the die and the package substrate. According to an example embodiment of the present invention, a protective coating adapted to resist etch chemicals is formed over the underfill material. The die is then etched using an etch chemistry that, absent the protective coating, would erode the underfill material. In this manner, etch chemistries that would harm the die, or even be unusable can be used to etch the die. In addition, problems associated with the underfill being eroded, such as die chipping, can be avoided.