Tape ball grid array semiconductor package structure and assembly process
US6549413B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2002 |
| Grant date | Apr 15, 2003 |
| Priority date | — |
| Expiry date | Feb 26, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/3011
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A package structure includes a heat spreader, a ground plane affixed to the heat spreader, and a flex tape interconnect substrate affixed to the ground plane. An aperture in the ground plane reveals a die attach surface on the heat spreader, and an aperture in the flex tape interconnect structure is aligned with the ground plane aperture such that the aligned apertures together with the revealed ground plane surface define a die cavity. The aperture in the ground plane is formed so as to form aperture walls substantially perpendicular to the ground plane. According to the invention the heat spreader, the ground plane, and the flex tape interconnect substrate have specified characteristics. Particularly, the heat spreader is provided as a metal sheet or strip, usually copper, having a “velvet type” oxide, usually a velvet black copper oxide, on at least the surface of the heat spreader to which the ground plane is to be affixed. And particularly, the ground plane is provided as a metal sheet or strip, usually copper, having a gray oxide or, more preferably, a velvet type oxide, usually a velvet black copper oxide, on both upper and lower surfaces. A velvet type oxide is …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.