Front side coating for bump devices
US6566762B1 · kind B1 · utility
8Cited by
13References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 4, 2002 |
| Grant date | May 20, 2003 |
| Priority date | — |
| Expiry date | Sep 4, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/351
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
Flip chips with improved solder bump strength are provided. A solder mask layer is placed and patterned on a front side of a wafer of semiconductor chips with semiconductor devices and bond pads. The solder mask is patterned to expose the bond pads. Solder bumps are electrically connected to the bond pads. The solder mask is thick enough to extend up to at least a quarter of the solder bumps and is in contact with the solder bumps. The wafer is then cut into individual chips. The chips may be sold to customers, who may mount the chip on a substrate without underfill.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.