Patent ID: 6337509
Filing Date: 2002-01-08
Classification: H01L

Abstract:
A removable fixture for attaching a semiconductor chip in a solder-effected connection to a substrate consisting of a conformal chip carrier, the semiconductor chip comprising a flip chip having an array of joining material bumps consisting of solder balls attached to said flip chip with a controlled collapse chip connection (C4) process, the substrate having an array of conductive pads corresponding to the array of joining material bumps, the fixture comprising:a body having a first cavity for containing the semiconductor chip and a second cavity in communication with the first cavity for containing the substrate, whereby the substrate is placed over the semiconductor chip with the conductive pads opposing and in contact with the joining material bumps, such that during reflow of the joining material bumps, at elevated temperatures commensurate with the type of solder utilized, the weight of the substrate acts against the joining material bumps and aids in the attachment of the semiconductor chip to the substrate to form electrical connections therebetween, said fixture being removed upon completion of said electrical connections between said semiconductor chip and said substrate.