Patent ID: 8919632
Filing Date: 2014-12-30
Classification: B23K,H01L

Abstract:
1. A method of detecting a bonding failure of a wire bonder, the wire bonder comprising a bonding tool operative to form an electrical connection between a semiconductor die and a substrate using a bonding wire, the method comprising the steps of: forming a first wire bond on a first surface located on the semiconductor die using the bonding tool and the bonding wire; forming a second wire bond on a second surface located on the substrate using the bonding tool and the bonding wire such that a wire loop connects the first and second wire bonds; moving the bonding tool in a direction away from the second wire bond to break the bonding wire from the second wire bond; detecting that the second wire bond does not remain bonded to the substrate; and determining an occurrence of the bonding failure, wherein the step of detecting that the second wire bond does not remain bonded to the substrate comprises the steps of: moving the bonding tool in a direction towards the substrate while detecting a position of the bonding tool at which an electrical connection occurs between the bonding wire and the substrate; comparing the detected position of the bonding tool with a predetermined position of the bonding tool, the predetermined position of the bonding tool indicating an absence of a bonding failure; detecting that the detected position of the tip of the bonding tool does not substantially correspond to the predetermined position of the bonding tool; and determining that the second wire bond is no longer bonded to the substrate.