Microelectronic package having wire bond vias and stiffening layer
View Patent ↗Microelectronic components and methods forming such microelectronic components are disclosed herein. The microelectronic components may include a plurality of electrically conductive vias in the form of wire bonds extending from a bonding surface of a substrate, such as surfaces of electrically conductive elements at a surface of the substrate.
1. A microelectronic package comprising:
a component having a surface and a plurality of conductive elements at the surface;
a plurality of wire bonds having first ends joined to the conductive elements and second ends remote from the first ends, the wire bonds having lengths between their respective first and second ends;
a dielectric stiffening layer overlying the conductive elements and the surface, and covering a first portion of the length of each of the wire bonds; and
an encapsulation layer overlying the dielectric stiffening layer, in which the dielectric stiffening layer is stiffer and other than the encapsulation layer, above the surface of the component and covering a second portion of the length of each of the wire bonds, wherein second ends of the wire bonds are at least partially uncovered by the encapsulation layer at a surface of the encapsulation layer above the dielectric stiffening layer and remote from the dielectric stiffening layer.
2. The microelectronic package of claim 1 , wherein the component is a substrate.
3. The microelectronic package of claim 1 , further comprising a raised material region other than the encapsulation layer and the dielectric stiffening layer, the raised material region at least partially bordering (i) the dielectric stiffening layer in a direction extending from the surface of the component and at least one direction parallel to the surface of the component and (i) an area of the surface of the component at which the first ends of the wire bonds are joined respectively with the conductive elements.
4. The microelectronic package of claim 1 , wherein the dielectric stiffening layer covers at least 10% of the length of the wire bonds.
5. The component of claim 1 , wherein the dielectric stiffening layer covers at least 50 micrometers of the length of the wire bonds.
6. The component of claim 1 , wherein each of the wire bonds is stitch bonded to one of the conductive elements.
7. The component of claim 1 , wherein the wire bonds have bonding tool marks thereon adjacent the second ends of the wire bonds.
8. The component of claim 7 , wherein the wire bonds are tapered in at least one direction adjacent the second ends of the wire bonds.
9. The component of claim 7 , wherein the bonding tool mark is a ball-shaped region.
10. The component of claim 1 , wherein the second ends of the wire bonds project away from the encapsulation layer at an angle of 65 to 90 degrees with respect to a plane defined by the surface of the encapsulation layer.