Patent ID: 9559071
Date: 2017-01-31
CPC Classifications: H01L

Claim:
1. A package structure, comprising: a semiconductor die; a substrate; a pillar bump bonded to the semiconductor die and the substrate, the pillar bump being electrically coupled to the semiconductor die and the substrate, wherein the pillar bump comprises a pillar and a bonding layer, the pillar consists of a metal material selected from a group consisting of copper, gold, platinum, titanium, nickel, aluminum, and a combination thereof, the bonding layer is between the pillar and the substrate, and the pillar include a linear sidewall profile; and an elongated solder bump bonded to the semiconductor die and the substrate, wherein a height of the elongated solder bump is substantially equal to a height of the pillar bump, wherein the elongated solder bump has a solder portion, the solder portion of the elongated solder bump has a first width, at a first horizontal plane passing through an upper end of a sidewall surface of the elongated solder bump, and the solder portion has a second width, at a second horizontal plane passing through a midpoint of the sidewall surface, and wherein a ratio of the second width to the first width is in a range from about 0.5 to about 1.1, wherein the pillar has a melting point higher than that of the elongated solder bump.