Patent ID: 8188606

Claim:
A semiconductor package, comprising: a device pad on a substrate; a polybenzoxazole (PBO) layer overlying the substrate, the PBO layer having an opening to expose the device pad; a redistribution layer (RDL) comprising a landing pad, the RDL positioned on the PBO layer and conductively coupled to the device pad; a polymer layer on the RDL; an under bump metal pad (UBM) on the landing pad and extending onto a top surface of the polymer layer, wherein the UBM electrically connects to the landing pad through an opening in the polymer layer; and a solder bump on the UBM; wherein a shortest distance from a center of the landing pad to an outer edge of the landing pad, and a shortest distance from a center of the UBM to an outer edge of the UBM are in a ratio that ranges from 0.5:1 up to 0.95:1.