Patent 8101435 was granted and assigned to LAPIS Semiconductor Co.,Ltd. on January, 2012 by the United States Patent and Trademark Office.
A semiconductor device fabrication method can improve yield of semiconductor devices and decrease (or prevent) waste of non-defective semiconductor chips. This fabrication method has a step of performing characteristic inspection after packaging a semiconductor chip every time a semiconductor chip layer is formed. The fabrication method makes another semiconductor chip layer on this semiconductor chip layer only when the inspection indicates that the semiconductor chip is a non-defective product.