Semiconductor packages and methods of packaging semiconductor devices

1. A method of manufacturing a semiconductor package comprising:

providing a base carrier, which comprises a conductive material, having a first and second major surface;

selectively removing a portion of the conductive material from the first major surface of the base carrier;

forming a first dielectric layer on the first major surface of the base carrier such that a portion of the first major surface is exposed from the first dielectric layer;

mounting a die on the first major surface of the base carrier, the die is coupled to the base carrier;

encapsulating the die with a cap;

selectively removing a portion of the conductive material from the second major surface of the base carrier, wherein selectively removing a portion of the conductive material from the second major surface of the base carrier comprises forming via contacts; and

forming a second dielectric layer on the second major surface of the base carrier such that a portion of the second major surface is exposed from the second dielectric layer.

2. The method of claim 1 wherein the base carrier comprises a die region and a periphery region surrounding the die region; and

wherein selectively removing a portion of the conductive material from the first major surface of the base carrier comprises forming conductive traces that extend from the die region to the periphery region.

3. The method of claim 1 further comprising forming a plurality of contact pads on the first major surface of the base carrier.

4. The method of claim 3 wherein the contact pads are exposed from the first dielectric layer.

5. The method of claim 1 further comprising forming a second conductive traces on the second major surface of the base carrier, wherein the second conductive traces are electrically coupled to the via contacts.

6. A method of forming a semiconductor package comprising:

providing a conductive base carrier which comprises a lead frame having at least a conductive line level with conductive traces separated by spaces defined on a first surface of the base carrier;

forming a first dielectric layer on the first surface, the first dielectric layer filling the spaces and covering portions of the conductive traces while leaving portions of the first surface exposed;

mounting a die on the first surface of the base carrier, the die having die contacts being coupled to the exposed first surface of the base carrier;

encapsulating the die with a cap;

patterning the second surface of the base carrier forms via contacts of a via level, wherein the conductive traces and via contacts are single unitary structures of which no seam or interface exists with and among them;

forming a second dielectric layer with openings which exposes portions of the patterned second surface of the base carrier; and

forming package contacts which conductively interconnected to the die contacts.

7. The method of claim 6 comprising forming a second conductive line level having second conductive traces separated by spaces over the second dielectric layer.

8. The method of claim 7 wherein forming the second conductive line level comprises:

forming a mask having openings corresponding to the second conductive traces, and filling the openings with conductive material; or

forming a conductive layer over the second dielectric layer, and patterning the conductive layer to form the second conductive traces.

9. A method of forming a semiconductor package comprising:

providing a conductive base carrier having at least a conductive line level with conductive traces separated by spaces defined on a first surface of the base carrier, which comprises

patterning the first surface of the base carrier to form first conductive traces of a first line level and via contacts of a first via level and to form topography defining conductive traces of a further line level;

forming a first dielectric layer on the first surface, the first dielectric layer filling the spaces and covering portions of the first conductive traces while leaving portions of the first surface exposed;

mounting a die on the first surface of the base carrier, the die having die contacts being coupled to the exposed first surface of the base carrier;

encapsulating the die with a cap;

patterning the second surface of the base carrier;

forming a second dielectric layer with openings which expose portions of the patterned second surface of the base carrier; and

forming package contacts which conductively interconnected to the die contacts.

10. The method of claim 9 wherein the topography defines second conductive traces of a second line level and patterning the second surface of the base carrier forms the second conductive traces of the second line level.

11. The method of claim 9 wherein the topography defines intermediate conductive traces of an intermediate line level.

12. The method of claim 11 wherein patterning the second surface of the base carrier forms intermediate via contacts and the intermediate conductive traces of the intermediate line level.

13. The method of claim 9 comprising forming contact pads on the exposed portions of the first surface.

14. The method of claim 10 comprising:

forming a third dielectric layer filling spaces between and covering the second conductive traces;

patterning the third dielectric layer to form openings to expose portions of the second conductive traces; and

forming package pads on the exposed portions of the second conductive traces, wherein the package contacts are formed on the package pads.

15. The method of claim 12 comprising forming a second conductive line level having second conductive traces over the intermediate via contacts, which comprises:

forming a conductive layer over the intermediate via contacts; and

patterning the conductive layer to form the second conductive traces.

16. The method of claim 12 comprising forming a second conductive line level having second conductive traces over the intermediate via contacts, which comprises:

forming a mask having openings corresponding to the second conductive traces over the second dielectric layer; and

filling the openings with conductive material to form the second conductive traces.

17. The method of claim 9 wherein patterning the second surface of the base carrier is performed after encapsulating the die with the cap.

18. A method of forming a semiconductor package comprising:

providing a conductive base carrier having at least a conductive line level with conductive traces separated by spaces defined on a first surface of the base carrier;

mounting a die on the first surface of the base carrier, the die having die contacts being coupled to the first surface of the base carrier;

encapsulating the die with a cap;

patterning a second surface of the base carrier, wherein patterning the second surface of the base carrier forms first via contacts of a first via level;

forming a dielectric layer with openings which expose portions of the patterned second surface of the base carrier; and

forming package contacts which conductively interconnected to the die contacts.

19. The method of claim 18 comprising forming a second conductive line level having second conductive traces over the dielectric layer, which comprises:

forming a mask having openings corresponding to the second conductive traces over the dielectric layer; and

filling the openings with conductive material to form the second conductive traces.

20. The method of claim 19 comprising:

removing the mask having the openings after forming the second conductive traces; and

forming a second dielectric layer filling spaces between and covering the second conductive traces.

21. The method of claim 20 comprising:

patterning the second dielectric layer to form openings to expose portions of the second conductive traces; and

forming package pads on the exposed portions of the second conductive traces, wherein the package contacts are formed on the package pads.

22. The method of claim 18 comprising forming a second conductive line level having second conductive traces over the dielectric layer, which comprises:

forming a conductive layer over the dielectric layer; and

patterning the conductive layer to form the second conductive traces.

23. The method of claim 22 comprising forming a second dielectric layer filling spaces between and covering the second conductive traces.

24. The method of claim 23 comprising:

patterning the second dielectric layer to form openings to expose portions of the second conductive traces; and

forming package pads on the exposed portions of the second conductive traces, wherein the package contacts are formed on the package pads.