Patent ID: 6541305
Filing Date: 2003-04-01
Classification: H01L,H05K,Y02P

Abstract:
A method of joining first and second substrates through a solder element interconnect, the method comprising the steps of:obtaining a heat resistant boat having a plurality of cavities wherein each of the cavities has a first portion sized to receive a quantity of solder and a second portion narrower in cross section than the first portion; placing a quantity of solder in each of the first portion of the cavities; placing the first substrate in juxtaposition with the heat resistant boat so that the first substrate contacts each of the quantities of solder; clamping the first substrate to the heat resistant boat; heating the first substrate, heat resistant boat and quantities of solder so as to reflow the solder, the quantities of solder joining with the first substrate while also being forced into the second portion of each of the cavities so as to form a plurality of elongated solder elements in a first array on the first substrate; forming a plurality of pads of solder paste in a second array on a second substrate wherein the first and second arrays are mirror images of one another; establishing at least one standoff element on one of the first or second substrates; assembling the first and second substrates such that each of the solder elements on the first substrate are embedded in each of the solder paste pads and the at least one standoff element is interposed between the first and second substrates; heating the first and second substrates at a predetermined temperature to cause melting of the plurality of solder elements and the plurality of solder pads into single solder elements, the at least one standoff controlling the separation distance between the first and second substrates.