Patent ID: 8314484

Claim:
A semiconductor device comprising: a metal leadframe having an external-extraction metal lead and a bonding portion; a semiconductor chip die-bonded onto the bonding portion; a joint member electrically connecting an electrode formed on a main surface of the semiconductor chip and the external-extraction metal lead; a rear-surface electrode formed on a rear surface of the semiconductor chip; and insulating molding compounds formed so as to cover the semiconductor chip and a periphery of the semiconductor chip, wherein the semiconductor chip and the metal leadframe are jointed to each other via a porous joint layer in which conductive particles containing Ag as a bonding material are bonded to themselves, a volume ratio of a metal portion of the joint layer is 30 to 80%, a metal oxide film having a thickness of 1 to 600 nm is formed on surfaces of metals inside the joint layer, and a thermoset resin is filled in at least a part of void portions between the conductive particles.