An integrated circuit has corner regions and non-corner regions between the corner regions and includes a semiconductor substrate, conductive pads, passivation layer, post-passivation layer, first conductive posts, and second conductive posts. The conductive pads are disposed over the semiconductor substrate. The passivation layer and the post-passivation layer are sequentially disposed over the conductive pads. The first conductive posts and the second conductive posts are disposed on the post-passivation layer and are electrically connected to the conductive pads. The first conductive posts are disposed in the corner regions and the second conductive posts are disposed in the non-corner regions. Each of the first conductive posts has a body portion and a protruding portion connected to the body portion. A central axis of the body portion of the first conductive post has an offset from a central axis of the protruding portion of the first conductive post.

A method includes depositing a first dielectric layer as a first surface layer of a first package component, forming a plurality of metal pads in the first dielectric layer, depositing a second dielectric layer as a second surface layer of a second package component, and bonding the second package component to the first package component. The first dielectric layer is bonded to the second dielectric layer. At a time after the bonding, a metal pad in the plurality of metal pads has a top surface contacting a bottom surface of the second dielectric layer.