Ball grid array type semiconductor device
US5596227A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 1, 1995 |
| Grant date | Jan 21, 1997 |
| Priority date | — |
| Expiry date | Sep 1, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2201/10734
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A mother board has wiring patterns formed on the front and rear surfaces thereof. A solder ball is formed on an island at the end of each wiring pattern on the rear surface. Vias are formed in the mother board, surrounding an LSI mount area of the board. An LSI chip mounted on the mother board is sealed by a front surface sealing resin layer. A rear surface sealing resin layer having substantially the same size and thickness as those of the front surface sealing resin is molded on the rear surface of the mother board at the position registered to the front surface sealing resin layer. The front and rear surface sealing resin layers are integrally formed through the vias. Resin layers in the vias function as anchors for integrating the upper and lower sealing resin layers. Semiconductor devices of a resin molded type are provided which can improve reliability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.