Integrated circuit leaded stacked package system

1. An integrated circuit leaded stacked package system comprising:

forming a no-lead integrated circuit package having a mold cap;

attaching a mold cap of an extended-lead integrated circuit package having extended leads with a stack portion opposite a base portion, the mold cap of the extended-lead integrated circuit package facing the mold cap of the no-lead integrated circuit package, the base portion thereunder; and

attaching a top integrated circuit package with exposed leads on the stack portion of the extended leads having the base portion horizontally extended away from the exposed leads and the extended-lead integrated circuit package.

2. The system as claimed in claim 1 wherein attaching the top integrated circuit package includes attaching the top integrated circuit package on the extended-lead integrated circuit package having second leads.

3. The system as claimed in claim 1 wherein attaching the extended-lead integrated circuit package comprises applying a lead-end encapsulant over the lead ends of the extended leads.

4. The system as claimed in claim 1 wherein attaching the extended-lead integrated circuit package comprises applying a package encapsulant over a portion of the no-lead integrated circuit package and a portion of the extended-lead integrated circuit package including lead ends of the extended leads.

5. An integrated circuit leaded stacked package system comprising:

a no-lead integrated circuit package having a mold cap;

a mold cap of an extended-lead integrated circuit package having extended leads with a stack portion opposite a base portion, the mold cap of the extended-lead integrated circuit package facing the mold cap of the no-lead integrated circuit package, the base portion thereunder; and

a top integrated circuit package with exposed leads on the stack portion of the extended leads having the base portion horizontally extended away from the exposed leads and the extended-lead integrated circuit package.

6. The system as claimed in claim 5 wherein the extended-lead integrated circuit package includes the extended-lead integrated circuit package having second leads.

7. The system as claimed in claim 5 wherein the extended-lead integrated circuit package comprises a lead-end encapsulant over the lead ends of the extended leads.

8. The system as claimed in claim 5 wherein the extended-lead integrated circuit package comprises a package encapsulant over a portion of the no-lead integrated circuit package and a portion of the extended-lead integrated circuit package including lead ends of the extended leads.

9. The system as claimed in claim 5 wherein:

the no-lead integrated circuit package is a no-lead integrated circuit package having a no-lead pad;

the extended-lead integrated circuit package is an extended-lead integrated circuit package with an extended lead having an extension beyond a mold cap; and

further comprising:

an extended-lead integrated circuit package with a lead end of the extended lead substantially coplanar with the no-lead pad.

10. The system as claimed in claim 9 wherein the extended-lead integrated circuit package comprises extended leads formed towards a side having a first integrated circuit die.

11. The system as claimed in claim 9 wherein the extended-lead integrated circuit package comprises an interposer surface of the extended-lead integrated circuit package.

12. The system as claimed in claim 9 wherein the extended-lead integrated circuit package comprises an encapsulant with an interposer surface of the extended-lead integrated circuit package substantially exposed.

13. The system as claimed in claim 9 wherein the extended-lead integrated circuit package is an interposer.