Patent ID: 7847406

Claim:
A bump for forming an electrode on a semiconductor device, said bump comprising: a solder alloy material layer formed of a solder alloy material; and a flux material layer formed of a flux material layer composition on the solder alloy material layer, wherein the solder alloy material layer and the flux material layer are heated and fused, wherein said bump comprising the solder alloy material layer and the flux material layer fused has a diameter of 30 μm or less, and wherein, for each of the solder alloy material layer composition and the flux material layer composition, a solid content thereof is from 0.01% by mass to 30.0% by mass; a viscosity thereof is from 1 mPa·s to 20 mPa·s; a surface tension thereof is from 20 mN/m to 70 mN/m; a vapor pressure thereof at room temperature is from 0.001 mmHg to 50 mmHg; and a contact angle thereof is from 30° to 170° with a material which constitutes a liquid spraying nozzle surface.