Patent ID: 6279816
Filing Date: 2001-08-28
Classification: H01L,H05K

Abstract:
A process for mounting conductor balls on terminal pads of semiconductor devices or other electronic devices on a semiconductor wafer or other substrate having multiple divisions, stepwise for the multiple divisions of the substrate that include different numbers of the devices, the process comprising the steps of:(A) attaching to an adsorbing head a mask plate selected from a set of plural mask plates having respective openings different in shape and/or position corresponding to an area of the substrate occupied by a group of the devices included in a selected one of the divisions;(B) attaching to the selected mask plate attached to the head an adsorbing plate having adsorbing holes for adsorbing the conductor balls, the adsorbing holes being arranged corresponding in number and position to the terminal pads present in one of the divisions that includes a largest number of the devices;(C) adsorbing the conductor balls to the adsorbing holes exposed through the opening of the selected mask plate thereby causing the conductor balls to be only adsorbed by the adsorbing holes corresponding in position to the terminal pads of the devices of the group in the selected one division of the substrate;(D) mounting the conductor balls onto the terminal pads of the devices of the group in the selected one division of the substrate;(E) removing the adsorbing plate from the selected mask plate;(F) removing the mask plate from the head; and(G) repeating the steps (A) to (F) until all divisions of the substrate get provided with the conductor balls mounted on the terminal pads.