PBGA stiffener package
US5972738A · kind A · utility
16Cited by
18References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 1997 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | May 7, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/181
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A PBGA package includes PBGA member, a stiffener ring, and a stiffener fixture which includes a retaining recess having a floor for receiving the stiffener ring and includes a ledge positioned above the recess floor for receiving the PBGA member. An adhesive layer is applied to the stiffener ring, which is adhered to the PBGA member. The stiffener ring and PBGA member are essentially coplanar to less than 8 mils. A top plate is placed on top of the PBGA member and the ring and member are secured together tightly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.