Patent ID: 8446019
Filing Date: 2013-05-21
Classification: H01L

Abstract:
1. A structure, comprising: a device pad on a substrate; an under bump metal pad on the device pad; a passivation layer on the substrate, the passivation layer having an opening to expose a portion of the device pad; a polymer layer on the passivation layer, the polymer layer extending outward away from the device pad beyond an outer edge of the under bump metal pad, wherein the under bump metal pad extends onto a top surface of the polymer layer and electrically connects to the device pad through an opening in the polymer layer; and a solder bump on the under bump metal pad; wherein a shortest distance from a center of the device pad to an outer edge of the device pad, and a shortest distance from a center of the under bump metal pad to the outer edge of the under bump metal pad are in a ratio that ranges from 0.5:1 up to 0.95:1.