Method of fabricating a flip-chip ball-grid-array package with molded underfill
US6451625B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2001 |
| Grant date | Sep 17, 2002 |
| Priority date | — |
| Expiry date | Jan 13, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/351
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A method of fabricating a FCBGA (Flip-Chip Bal-Grid-Array) package with molded underfill is proposed, which is characterized by the forming of a mold-buffering opening in the solder mask at the exit of the vent hole in the substrate, wherein the mold-buffering opening is dimensioned to be greater in width than the inside diameter of the vent hole, so that during molding process when the encapsulation material infiltrates to the exit of the vent hole, it can be confined within the mold-buffering opening, thereby preventing it from flashing to nearby solder-ball pads. Since there would substantially exist no mold flash over the exposed surface of the solder mask and the solder-ball pads, the resulted FCBGA package would be assured in the quality of its outer appearance and the bonding between the solder-ball pads and the subsequently attached solder balls thereon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.