Patent ID: 7118940
Filing Date: 2006-10-10
Classification: H01L,H05K,Y02P

Abstract:
1. A method of forming an electronic package having a controlled height standoff distance between a surface mount device and a circuit board, said method comprising the steps of: providing a circuit board having a substrate and circuitry comprising at least one mounting pad; providing a surface mount device having circuitry comprising at least one contact terminal; disposing an underfill material at a plurality of discrete locations between the circuit board and the surface mount device; disposing a plurality of standoff members in the underfill material at the plurality of discrete locations; and forming a solder joint to connect the at least one contact terminal of the surface mount device to the at least one of the mounting pad on the circuit board, wherein the standoff members provide a separation distance between the circuit board and the surface mount device; wherein the step of forming the solder joint comprises providing at least one solder ball in contact with the at least one contact pad and the at least one contact terminal, and heating the at least solder ball to reflow and form the solder joint; wherein the solder ball has a height dimension and wherein each of the standoff members has a height dimension less than the height dimension of the solder ball.