Patent ID: 7015066
Filing Date: 2006-03-21
Classification: H01L,Y10S,Y10T

Abstract:
1. A method comprising: making a microelectronic device comprising providing a first substrate having a top face, opposite bottom face, and a plurality of sides, and contact elements formed on the top face of the first substrate; inducing stresses in the first substrate comprising: firmly restraining the first substrate in a fixture at room temperature, and wherein the fixture engages the sides of the first substrate; placing a flip chip on the first substrate so that electrically conductive bumps of the flip chip are aligned with the contact elements on the substrate; heating the flip chip, first substrate and the fixture to reflow the electrically conductive bumps on the flip chip; cooling the flip chip, first substrate and fixture to solidify the electrically conductive bumps and to mount the flip chip to the first substrate; removing the flip chip mounted substrate from the fixture; wherein the fixture comprises a plurality of substrate restraining members each for engaging one of the sides of the first substrate, and wherein the plurality restraining members have a coefficient of thermal expansion ranging from 4–10 ppm/° C., and wherein the step of restraining the first substrate is preformed by the plurality of substrate restraining member; wherein the plurality of restraining members includes a first and a second elongated stationary stop, and a first and a second movable clamp; wherein the fixture further comprises a substrate fixture base having first and second threaded holes formed therethrough, a screw received in each of the holes and the screw having one end connected to one of the first and second movable clamp and constructed and arranged so that tightening the screw causes the movable clamp to engage a side of the first substrate.