Patent ID: 7115446
Filing Date: 2006-10-03
Classification: H01L

Abstract:
1. A flip chip bonding method for enhancing a bonding performance in a semiconductor packaging process for bonding a chip having bonding pads on a substrate having lead pads, the method comprising the steps of: performing pretreatment of a wafer having chips, dicing the wafer, and obtaining a pretreated individual chip; performing pretreatment of a substrate; aligning the pads of the pretreated chip with the pads of the pretreated substrate, and bonding the chip and the substrate together by applying an ultrasonic wave and heat using a collet and simultaneously applying pressure wherein the ultrasonic wave is applied in a safe range of frequency, wherein the safe range is from about 50 KHz to about 100 KHz, or in the range for minimizing the loss of the ultrasonic energy, wherein the range is from about 100 KHz to about 250 KHz; and performing post treatment for filling or molding resin after bonding.