Patent ID: 7294912
Filing Date: 2007-11-13
Classification: H01L

Abstract:
1. A semiconductor device comprising: a heat sink having a surface with a predetermined range of surface roughening; an IC chip mounted and fixed on a specific face of the heat sink; a lead frame provided at locations surrounding the IC chip and electrically connected to the IC chip; and a sealing mold resin package for enclosing the heat sink, the IC chip, and the lead frame, wherein: a portion of the heat sink is exposed to the outside of the mold resin package; a portion of the lead frame protrudes out from the mold resin package as outer leads having a surface with a different predetermined range of surface roughening; when a specific surface area is defined as a ratio of an actual area of uneven surface to an area of an imaginary flat surface, the specific surface area of a surface of the heat sink is set at a value in the range 1.13 to 1.32; and the specific surface area of the surface of the outer leads is set at a value in the range 1.05 to 1.20 to optimize heat sink adhesion strength, resin-burr formation, and outer-lead placement on an external substrate.