Patent ID: 6334937
Filing Date: 2002-01-01
Classification: C25D

Abstract:
An apparatus for plating solder on a microelectronic workpiece comprising:a reactor chamber adapted to hold an electroplating solution comprising an aqueous solution including a lead compound as a source of lead ions and a tin compound as a source of tin ions; a chemical delivery system adapted to provide the electroplating solution comprising the aqueous solution including the lead compound and the tin compound to the reactor chamber at a high flow rate; a workpiece support including a contact assembly for providing electroplating power to a surface at a side of the workpiece that is to be plated, the contact arranged for contacting the workpiece at a large plurality of discrete contact points, the contact points being isolated from exposure to the electroplating solution; a consumable anode comprised of a metal selected from the group consisting of tin and lead, the consumable anode being spaced from the workpiece support within the reaction chamber and positioned for contact with the electroplating solution.