Patent ID: 8377751

Claim:
A method for manufacturing a semiconductor device having a main sealing body for sealing a semiconductor chip and a plurality of leads exposed from the main sealing body, the method comprising the steps of: (a) providing a semiconductor package including: the main sealing body for sealing the semiconductor chip; the leads exposed from the main sealing body; dam bars formed integrally with the leads; and at least one secondary sealing body formed in an area enclosed by the main sealing body, the leads and the dam bars; (b) radiating a laser beam to the secondary sealing body to remove at least a portion of the secondary sealing body, the laser beam being radiated along a path extending along side faces of the leads and side faces of the dam bars which are in contact with the secondary sealing body; (c) after the step (b), removing a portion of the dam bars; and (d) after the step (c), forming a plating film over a surface of each of the leads.