Patent ID: 6890836
Filing Date: 2005-05-10
Classification: H01L

Abstract:
1. A method to singulate a semiconductor wafer into electronic-device chips, said wafer having a wafer thickness, a first, active surface and an opposite second surface, comprising the steps of: forming first trench streets of a first trench width and a first depth less than the wafer thickness across said first wafer surface to define the outline of said chips; protecting said active first wafer surface, flipping said wafer to expose said second wafer surface; and subjecting said wafer to a wafer-cutting saw so that said saw cuts said second surface along the first trench streets to form second trench streets of a second trench width and a second depth less than the wafer thickness to singulate the semiconductor wafer into chips, the sum of the first depth and the second depth not less than the wafer thickness.