摘要:
A process of fabricating a circuitized structure is provided. The process includes the steps of providing an organic substrate having circuitry thereon; applying a dielectric film on the organic substrate; forming microvias in the dielectric film; sputtering a metal seed layer on the dielectric film and the microvias; plating a metallic layer on the metal seed layer; and forming a circuit pattern thereon.
摘要:
A process of fabricating a circuitized substrate is provided which comprising the steps of: providing an organic substrate having circuitry thereon; applying a dielectric film on the organic substrate; forming microvias in said dielectric film; sputtering a metal seed layer on the dielectric film and in said microvias; plating a metallic layer on the metal seed layer; and forming a circuit pattern thereon.
摘要:
A circuit assembly that includes a circuitized substrate having a dielectric interior layer with a first surface and at least one hole therein. A filler material substantially fills the hole within the dielectric interior layer. A first wiring layer is positioned on the first surface of the dielectric interior layer, wherein the first wiring layer substantially covers the hole and assists in retaining the filler material within the hole in the dielectric interior layer. A first dielectric photoresist layer is positioned on the first wiring layer and on the first surface of the dielectric interior layer. The first dielectric photoresist layer also includes at least one hole therein. The filler material also substantially fills the hole within the first dielectric photoresist layer. A second wiring layer is positioned on the first dielectric photoresist layer and includes a plurality of conductive pads as part thereof. At least one external component can be electrically coupled to the conductive pads of the second wiring layer.
摘要:
The present invention permits solder joints to be made directly to via and through holes without the solder being wicked into the vias or through holes, by filling plated through holes with an epoxy or cyanate fill composition. When cured and overplated, the fill composition provides support for the solder joint and provides a flat solderable surface for the inter-connection. In certain embodiments, the cured fill compositions, offer a further advantage of being conductive. The invention also relates to several novel methods for filling through holes with such fill compositions, and to resistors located in through holes and vias.
摘要:
According to the present invention a technique for providing a planarized substrate with dendritic connections of solder balls, especially a multi-layer ceramic substrate is provided. In the case where the substrate has a raised central portion on the top surface on which are disposed top surface metallurgy pads, a layer of conformable photoimagable material is placed over the top surface.The photoimagable material is exposed and developed in a pattern corresponding to the pattern of the top surface metallurgy pads to form vias in the photoimagable material. Copper is plated in the vias in contact with the top surface metallurgy pads. The exposed surface of the photoimagable surface is then planarized, preferably by mechanical polishing to form a flat planar surface, with the ends of the vias exposed. Dendritic connector pads are then grown on the exposed ends of the vias to which solder ball connections of an I/C chip are releasably connected.
摘要:
A method and apparatus for testing semi-conductor chips is disclosed. The individual semiconductor chips have I/O contacts. The apparatus is provided with an interposer that has contacts corresponding to the contacts on the semiconductor chip. Both the chip and the interposer contacts can be any known type including metal ball, bumps, or tabs or may be provided with dendritic surfaces. The chip contacts are first brought into relative loose temporary contact with the contacts on the interposer and then a compressive force greater that 5 grams per chip contact is applied to the chip to force the chip contacts into good electrical contact with the interposer contacts. Testing of the chip is then performed. The tests may include heating of the chip as well as the application of signals to the chip contacts. After testing the chip is removed from the substrate.
摘要:
According to the present invention a technique for providing a planarized substrate with dendritic connections of solder balls, especially a multi-layer ceramic substrate is provided. In the case where the substrate has a raised central portion on the top surface on which are disposed top surface metallurgy pads, a layer of conformable photoimagable material is placed over the top surface.The photoimagable material is exposed and developed in a pattern corresponding to the pattern of the top surface metallurgy pads to form vias in the photoimagable material. Copper is plated in the vias in contact with the top surface metallurgy pads. The exposed surface of the photoimagable surface is then planarized, preferably by mechanical polishing to form a flat planar surface, with the ends of the vias exposed. Dendritic connector pads are then grown on the exposed ends of the vias to which solder ball connections of an I/C chip are releasably connected.
摘要:
A process for manufacturing circuit boards comprising providing a circuitized substrate having a dielectric surface, providing a peel apart structure including a metal layer and a peelable film, laminating the peel apart structure to the circuitized substrate with the metal layer positioned adjacent said dielectric surface, forming holes in the circuitized substrate through the peel apart structure, applying a filler material including an organic base to the peel apart structure, applying a sacrificial film onto the filler material, and applying sufficient heat and pressure to the sacrificial film to force the filler material into the holes to substantially fill the holes is provided.
摘要:
A process of tenting plated through holes with a photoimageable dielectric is provided which includes a dielectric film comprising a photoimageable epoxy based resin layer and a peelable polyester layer. In accordance with the process of the present invention, the peelable polyester layer of the dielectric film is removed prior to baking, developing, patterning or curing the structure.
摘要:
A printed circuit board for use in an electronic device package such as a ball grid array package or organic chip carrier package includes a glass-free dielectric for separating and insulating power cores, circuitry or plated through holes from each other to prevent shorts caused by a migration of conductive material along glass-based prepreg substrates.