Method of mounting a semiconductor chip on a wiring substrate
US5813115A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1995 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Aug 2, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49204
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
When a semiconductor chip is mounted on a wiring substrate, an end of a metallic wire fed through a capillary is first fused to form a ball, which is in turn pressed against and bonded to an electrode pad formed on a semiconductor chip. The metallic wire is then cut at a location in the proximity of the ball so that a portion of the metallic wire remains as a protruding contact on the ball. The protruding contact is pressed against a shaping platform coated with a paste-like electrically-conductive adhesive film to thereby cause the protruding contact to have a given height and transfer a portion of the adhesive film to the protruding contact. The protruding contact is eventually bonded to an electrically-conductive film formed on the wiring substrate via the transferred portion of the adhesive film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.