Wafer-scale production of chip-scale semiconductor packages using wafer mapping techniques
US6589801B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1999 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | Aug 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/3025
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A method is disclosed for manufacturing chip-scale semiconductor packages at a wafer-scale level using wafer mapping techniques. In the method, a semiconductor wafer and/or a circuit substrate, each respectively comprising a plurality of individual chips and circuit pattern units, is/are pre-tested and discriminated in terms of the quality and/or grade of each individual chip unit and/or circuit pattern unit contained therein. The test results are marked on the lower surface of each chip unit and/or on each pattern unit. The substrate is laminated to the wafer to form a laminated assembly prior to performing the packaging process, which typically includes a wire bonding step, an encapsulation step and a solder ball welding step. A plurality of connected package units are thereby formed in the laminated substrate-wafer assembly. The package units are then singulated from each other and the laminated assembly by a cutting process. Using the pre-testing results, the method eliminates wasteful packaging of defective chips. The quality and/or grade of packaged units are marked on the chips in accordance with the pre-testing data, thereby enabling defective packages to be distinguished f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.