Apparatus and method incorporating discrete passive components in an electronic package
An apparatus and method for incorporating discrete passive components into an integrated circuit package. A metal layer is formed over a surface of a substrate. A layer of photosensitive material is then formed over the metal layer. Using standard photolithographic processing, a pattern is formed with the photosensitive material to expose at least one region of the metal layer. The remaining photosensitive material protects the underlying metal during metal etching. The substrate is then subjected to a metal etching process to remove the metal that is not protected by the photosensitive material. The remaining photosensitive material is then removed from each remaining area of the metal layer. The discrete passive components can then be attached to the formed metal lands.
1. A method of fabrication comprising;
forming a dielectric insulation layer over a passivation layer formed on a surface of a substrate having circuitry formed therein;
forming a metal layer over the dielectric insulation layer;
forming a layer of photosensitive material over the metal layer;
forming a pattern with the photosensitive material to expose at least one region of the metal layer;
removing the at least one exposed region of the metal layer using the pattern of photosensitive material as a mask, the removal of the at least one exposed region of the metal layer exposing at least one region of the dielectric insulation layer;
removing the at least one exposed region of the dielectric insulation layer; and
removing remaining photosensitive material from each remaining area of the metal layer for forming a structure to which a leadframe of an electronic package and an electronic component may be attached, wherein forming the structure comprises forming a bond pad to accept at least two bonds including a first bond to couple the structure to the electronic component and a second bond to couple the structure to a package lead of the leadframe of the electronic package, wherein the package lead is not formed over a surface of the substrate.
2. The method of claim 1 further comprising:
attaching the electronic component to the structure through the first bond, the electronic component comprising a discrete passive component; and
coupling the structure to the package lead through the second bond.
3. The method of claim 2 wherein the discrete passive component is soldered to the structure.
4. The method of claim 2 wherein the discrete passive component is wirebonded to the structure.
5. The method of claim 2 wherein the discrete passive component is attached with conductive epoxy.
6. The method of claim 1 wherein the surface of the substrate is a passivation layer.
7. The method of claim 1 wherein the metal layer is a multi-layer of different metals.
8. The method of claim 1 wherein the metal layer is formed of titanium tungsten and gold.
9. The method of claim 1 wherein the metal layer is a blanket metal layer.
10. The method of claim 9 wherein the blanket metal layer is a seed layer for pattern plating.
11. The method of claim 1 further comprising attaching a wirebond to the structure.
12. The method of claim 1 wherein the substrate is an integrated circuit die.