Patent ID: 8314490
Filing Date: 2012-11-20
Classification: H01L

Abstract:
1. A chip having a bump, comprising: a chip body, having a surface; at least one via, penetrating the chip body and exposed to the surface of the chip body, wherein the distance between the central axes of two adjacent vias is defined as a pitch; a passivation layer, disposed on the surface of the chip body, wherein the passivation layer has at least one opening, and the opening exposes the via; an under ball metal layer (UBM), disposed in the opening of the passivation layer, and connected to the via; and at least one bump, disposed on the under ball metal layer, wherein the diameter of the bump is smaller than or equals to two-thirds of the pitch, and the bump comprises: a first metal layer, disposed on the under ball metal layer, wherein the material of the first metal layer is copper (Cu); a second metal layer, disposed on the first metal layer, wherein the material of the second metal layer is nickel (Ni); and a third metal layer, disposed on the second metal layer, wherein the material of the third metal layer is tin (Sn), tin-silver alloy or gold (Au).