Patent ID: 6329302
Filing Date: 2001-12-11
Classification: H01L

Abstract:
A method for removing a top IC (integrated circuit) die attached to a bottom IC (integrated circuit) die with a die attach material within a multichip IC (integrated circuit) package, the top IC die having a first area that is smaller than a second area of said bottom IC die, and said top IC die being disposed inward from any edge of said bottom IC die such that a perimeter area of said bottom IC die is outside said top IC die, the method including the steps of:A. exposing an area of said top IC die, said area being smaller than said first area of said top IC die, and said area being disposed inward from any edge of said top IC die, wherein said first area of said top IC die outside said area remains covered, and wherein said perimeter area of said bottom IC die remains covered;B. etching said area of said top IC die that is exposed until said die attach material is exposed within said area;C. exposing said first area of said top IC die outside said area and exposing said perimeter area of said bottom IC die, wherein said first area of said top IC die outside said area forms a top IC die skeleton;D. etching said die attach material exposed within said area; andE. etching said die attach material between said top IC die skeleton and said bottom IC die until said top IC die skeleton detaches from said bottom IC die.