Patent ID: 7772106

Claim:
A method of making a semiconductor device, comprising: providing a substrate; forming first and second contact pads on the substrate; forming a first passivation layer over the substrate and first and second contact pads; removing a portion of the first passivation layer over the first and second contact pads; forming a protective insulating layer on a surface of the first passivation layer and first and second contact pads such that a top surface of the protective insulating layer follows a contour of the first and second contact pads and surface of the first passivation layer, the protective insulating layer having a thickness of 300-400 angstroms; removing the protective insulating layer over the first contact pad and surface of the first passivation layer while maintaining the protective insulating layer over the second contact pad; forming a metal layer on the first contact pad and surface of the first passivation layer, the metal layer also being formed on the top surface of the protective insulating layer which follows the contour of the first and second contact pads and surface of the first passivation layer, the metal layer being coiled over the surface of the substrate to produce inductive properties, wherein forming the metal layer involves use of a wet etchant, the second contact pad being protected from the wet etchant by the protective insulating layer; forming a second passivation layer over the metal layer and protective insulating layer; removing the protective insulating layer from the second contact pad after forming the second passivation layer; and forming an external connection to the second contact pad.