Integrated circuit package system with thermo-mechanical interlocking substrates

1. An integrated circuit package system comprising:

providing a plurality of substrates;

inserting a receptor in one of the substrates, the receptor held in and not extending through the one of the substrates;

inserting a conductive post in another of the substrates;

mounting the one of the substrates and the another of the substrates over one another with the conductive post engaging the receptor to thermally interlock without a separate bonding material; and

mounting an integrated circuit mounted on the one of the substrates or the another of the substrates.

2. The system as claimed in claim 1 wherein inserting the receptor in one of the substrates includes inserting the receptor in a polymeric substrate.

3. The system as claimed in claim 1 wherein mounting the one of the substrates and the another of the substrates over one another with the conductive post engaging the receptor includes:

forming the conductive post having a post diameter; and

forming the receptor having an opening diameter with the post diameter greater than the opening diameter.

4. The system as claimed in claim 1 wherein mounting the one of the substrates and the another of the substrates over one another with the conductive post engaging the receptor to thermally interlock without a separate bonding material includes reflowing an external interconnect to the bottom substrate.

5. The system as claimed in claim 1 wherein:

providing the plurality of the substrates includes:

providing a bottom integrated circuit package system having a bottom encapsulation over the one of the substrates; and

mounting the one of the substrates and the another of the substrates over one another includes:

attaching an adhesive between the substrates.

6. An integrated circuit package system comprising:

providing a plurality of integrated circuit package systems each having a substrate;

inserting a receptor in the substrate of one of the integrated circuit package systems, the receptor held in and not extending through the substrate;

inserting a conductive post in the substrate of another of the integrated circuit package systems; and

mounting the one of the integrated circuit package systems and the another of the integrated circuit package systems over one another with the conductive post engaging the receptor to thermally interlock without a separate bonding material.

7. The system as claimed in claim 6 wherein inserting the receptor includes inserting the receptor comprised of oxidation resistant conductive material.

8. The system as claimed in claim 6 wherein mounting the one of the integrated circuit package systems and the another of the integrated circuit package systems over one another with the conductive post engaging the receptor includes heating the substrate with the receptor expanding to an expanded receptor having an insertion diameter and the conductive post having a post diameter less than the insertion diameter.

9. The system as claimed in claim 6 wherein inserting the receptor includes inserting the receptor in a configuration of a top-narrowing conical, center-narrowing cylindrical, inside serrated, and top-widening conical.

10. The system as claimed in claim 6 wherein mounting the one of the integrated circuit package systems and the another of the integrated circuit package systems over one another includes reflowing a solder ball to the one of the substrates.

11. An integrated circuit package system comprising:

a plurality of substrates;

a receptor in one of the substrates, the receptor held in and not extending through the one of the substrates;

a conductive post in another of the substrates with the one of the substrates over the another of the substrates with the conductive post thermally interlocked with the receptor without a separate bonding material; and

an integrated circuit mounted on the one of the substrates or the another of the substrates.

12. The system as claimed in claim 11 wherein the receptor is in a polymeric substrate.

13. The system as claimed in claim 11 wherein:

the conductive post has a post diameter; and

the receptor has an opening diameter with the post diameter greater than the opening diameter.

14. The system as claimed in claim 11 further comprising an external interconnect attached to the bottom substrate.

15. The system as claimed in claim 11 wherein:

the plurality of the substrates includes:

a bottom integrated circuit package system having a bottom encapsulation over the one of the substrates; and

the one of the substrates and the another of the substrates over one another include:

an adhesive between the substrates.

16. The system as claimed in claim 11 wherein the plurality of the substrates includes a plurality of integrated circuit package systems each having a substrate.

17. The system as claimed in claim 16 wherein the receptor is comprised of oxidation resistant conductive material.

18. The system as claimed in claim 16 wherein the one of the integrated circuit package systems having the conductive post is over the another of the integrated circuit package systems having the receptor thermo-mechanically interlocked with the conductive post in the receptor.

19. The system as claimed in claim 16 wherein the receptor includes a top-narrowing conical receptor, center-narrowing cylindrical receptor, inside serrated receptor, and top-widening conical receptor.

20. The system as claimed in claim 16 further comprising a solder ball attached to the one of the substrates.