Patent ID: 8367479

Claim:
A manufacturing method of a semiconductor device, comprising the steps of: (a) preparing a lead frame having a die pad and a plurality of lead portions; (b) surface-roughening the lead frame partially; (c) bonding a semiconductor chip onto the top surface of the die pad via a die bonding material; and (d) sealing, with an insulating resin, an inner lead portion of each of the lead portions, a portion of the die pad, and the semiconductor chip, wherein in the step (b), etching is performed while covering a portion of the lead frame with a protecting member to roughen the surface of another portion not covered with the protecting member, wherein in the step (b), a portion of the die pad to be brought into contact with the insulating resin used for sealing in the step (d) is surface-roughened; wherein in the step (b), a second main surface of the die pad which is located on the side opposite to the first main surface in a thickness direction is not surface-roughened, wherein in the step (b), an outer lead portion of each of the lead portions is not surface-roughened, and wherein in the step (d), sealing with the insulating resin is performed so as to expose the bottom surface of the die pad.