Patent ID: 6391758
Filing Date: 2002-05-21
Classification: H01L

Abstract:
A method for forming a solder area over a lead frame, comprising the steps of:(1) preparing an electrically-conductive piece; (2) stamping the electrically-conductive piece into a predesigned lead frame shape; (3) attaching an electrically-insulating covering to a selected portion of the lead frame where a solder-ball opening is defined; (4) depositing an oxidation layer formed from brown copper oxide or black copper oxide over the uncovered portion of the lead frame that is uncovered by the electrically-insulating covering; (5) removing the electrically-insulating covering, with the left-behind void portion serving as a solder-ball opening in the oxidation layer; and (6) plating an alloy layer over the lead frame area confined by the solder-ball opening in the oxidation layer, with the plated alloy layer serving as the intended solder area.