Vertical laser fuse structure allowing increased packing density
US6225652A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 2, 1999 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Aug 2, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/0002
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A laser fuse structure and array are provided which use vertical vias to connect the fuse body of the laser fuse to an interconnect layer. The vias extend downward from the fuse body and thus require less layout area. The thermal conductivity of the vias are minimized by restricting their cross-sectional area and by using tungsten as the via fill material. In some embodiments, an underlying conductive line is widened to minimize damage to the line during lasering. In another embodiment, the width of the fuse body is increased to reduce the energy required to blow the fuse. As a result, unrelated circuit elements and patterned lines can be placed closer together in a laser fuse array, thereby increasing the packing density of such arrays.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.