WB FAILURE MODE 打线失效模式分析.ppt

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WB FAILURE MODE 打线失效模式分析

Typical Bonding Problems with Gold Bonding Wires Heraeus Zhaoyuan Precious Metal Materials Co.,Ltd TAILING Description ; Remaining tail at the stitch bond Reason ; Bond strength of the tail bond is stronger than the tensile strength of the bonding wire. This means; a. Good bondability between wire and substrate and/or b. Wire with low tensile strength (High elongation) Problem Solution ; a. Capillary with a smaller inside chamfer* (weaker and smaller tail bond) b. Higher tensile strength of the wire *)Attention ; can lead to golf club effect (trade-off) LOSING THE TAIL Description ; After the stitch bond is made and as the capillary is lifted ,the tail bond breaks prior to clamping and prior to feeding enough wire out of the capillary for the formation of the next ball bonding process is interrupted. Reason ; a. Week tail bond,with a very low welding strength Resulting in a “lift-off” b. Low bondability Problem Solution ; a. Increasing the bondability b. Capillary with a larger inside chamfer c.Increasing the substrate temperature SAGGING Description ; Sagging of the wire loop (frequently in conjunction with bending above the ball) Reason ; a. Formation of large grains above the ball b. Strong accelerating forces during wire bonding c. Insufficient tip lift d. Wire friction in capillary bore too high e. Unfavorable clamp tension and time Problem Solution ; a. Prevent or reduce the left mentioned criteria b. Use of other doped wires with elevated temp.strength and low tendency toward the formation of large grains above the flamed-off ball c. Larger diameter wire d. Reducing the elongation A good test method, after having selected the proper break load and elongation of bonding wire, is as follows ; - Keep the cap

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