Integrated circuit packaging system with lead interlocking mechanisms and method of manufacture thereof

1. A method of manufacture of an integrated circuit packaging system comprising:

forming a lead having an upper portion and a bottom portion with a first overhang portion from a top surface of the upper portion and the lead also having serrations along upper vertical sides intersecting the top surface;

forming an upper contact plate on the top surface;

forming a bottom contact plate on a bottom surface of the bottom portion;

attaching an integrated circuit die over the upper portion; and

encapsulating the upper portion and the integrated circuit die with an encapsulation leaving the bottom portion exposed.

2. The method as claimed in claim 1 wherein forming the lead includes:

forming a second overhang portion from the bottom surface of the lead.

3. The method as claimed in claim 1 wherein forming the lead includes:

forming the first overhang portion with the upper contact plate.

4. The method as claimed in claim 1 wherein:

forming the lead includes forming a second overhang portion from the bottom surface; and

further comprising:

forming a solder resistant layer on the bottom portion around the bottom surface and supported by the second overhang portion.

5. The method as claimed in claim 1 wherein forming the lead includes:

forming a second overhang portion with the bottom contact plate.

6. A method of manufacture of an integrated circuit packaging system comprising:

forming a lead having an upper portion and a bottom portion with a first overhang portion from a top surface of the upper portion and the lead also having serrations along upper vertical sides intersecting the top surface;

forming an upper contact plate on the top surface;

forming a bottom contact plate on a bottom surface of the bottom portion;

attaching an integrated circuit die over an upper portion;

encapsulating the upper portion and the integrated circuit die with an encapsulation leaving the bottom portion of the lead exposed; and

forming a solder resistant layer on the bottom portion of the lead around the bottom contact plate and the bottom surface.

7. The method as claimed in claim 6 wherein forming the lead includes forming a protrusive extension between the bottom portion and the upper portion of the lead.

8. The method as claimed in claim 6 wherein forming the lead includes forming the lead with more than four bottom vertical sides intersecting the bottom surface of the lead.

9. The method as claimed in claim 6 wherein forming the lead includes stamping the lead.

10. The method as claimed in claim 6 wherein forming the lead includes:

forming the lead with the serrations on bottom vertical sides intersecting the bottom surface of the lead.

11. An integrated circuit packaging system comprising:

a lead having an upper portion and a bottom portion with a first overhang portion from a top surface of the upper portion and the lead also having serrations along upper vertical sides intersecting the top surface;

an upper contact plate on the top surface;

a bottom contact plate on a bottom surface of the bottom portion;

an integrated circuit die mounted over the upper portion; and

an encapsulation covering the upper portion and the integrated circuit die with the encapsulation leaving the bottom portion exposed.

12. The system as claimed in claim 11 wherein the lead includes a second overhang portion from the bottom surface of the lead.

13. The system as claimed in claim 11 wherein the first overhang portion of the lead includes the upper contact plate.

14. The system as claimed in claim 11 wherein:

the lead includes a second overhang portion from the bottom surface of the bottom portion; and

further comprising:

a solder resistant layer on a bottom portion of the lead around the bottom surface and supported by the second overhang portion.

15. The system as claimed in claim 11 wherein the lead includes:

a second overhang portion with the bottom contact plate.

16. The system as claimed in claim 11 further comprising a solder resistant layer on the bottom portion of the lead around the bottom surface and the bottom contact plate.

17. The system as claimed in claim 16 wherein the lead includes a protrusive extension between the bottom portion and the upper portion of the lead.

18. The system as claimed in claim 16 wherein the lead includes the bottom surface having more than four bottom vertical sides intersecting the bottom surface.

19. The system as claimed in claim 16 wherein the lead has characteristics of a stamping process.

20. The system as claimed in claim 16 wherein the lead includes the serrations on bottom vertical sides intersecting the bottom surface of the lead.