Patent ID: 7202569

Claim:
A semiconductor device, comprising: a semiconductor element including a semiconductor element body comprising a low dielectric constant insulating film having a relative dielectric constant of 3.5 or less and a lower adhesion strength of 15 J/m 2 or less with respect to a material selected from the group consisting of a semiconductor substrate, a metal film, and an insulating film, a first electrode pad, and a first low melting point solder layer formed on the first electrode pad; a circuit substrate including a second electrode pad corresponding to the first electrode pad, and a second low melting point solder layer formed on said second electrode pad; a connection part including a solder bump composed of high melting point solder formed on one low melting point solder layer selected from the group consisting of the first and the second low melting point solder layers, and in which the first and second electrode pads are connected through the solder bump bonded to the other low melting point solder layer; and a sealing resin which is filled in between the semiconductor element and the circuit substrate so as to seal the connection part, and has flux function, wherein a ratio between the volume of the solder bump and the total volume of the first and second low melting point solder layers is in a range of 4:1 to 1:1, and a ratio between the volume of the first low melting point solder layer and the second low melting point solder layer is in a range of 1:1.6 to 1.6:1.