Patent ID: 7485563
Filing Date: 2009-02-03
Classification: H01L,H05K

Abstract:
1. A method of providing electrically conductive bumps on electrode pads of a microelectronic substrate comprising: providing a microelectronic substrate including electrode pads thereon; providing a sorting mask defining first openings and second openings therethrough, the second openings being larger than the first openings; disposing the mask onto the substrate such that the first openings and second openings register with respective ones of the electrodes pads; providing first solder portions onto corresponding ones of the electrode pads through the first openings, and second solder portions onto corresponding ones of the electrode pads through the second openings, the second solder portions being larger than the first solder portions and too large to be provided through the first openings, wherein the second solder portions are provided through the second openings prior to providing the first solder portions through the first openings; reflowing the first solder portions and second solder portions to form, respectively, first solder bumps and second solder bumps on respective ones of the electrode pads; and removing the mask after providing solder portions and before reflowing.