Abstract:
The present invention provides a circuit carrier for connecting to at least a bump. The circuit carrier comprises a substrate, at least a contact pad on a surface of the substrate and a solder mask layer covering the substrate. The solder mask has at least a stepped opening that exposes a portion of the contact pad. The stepped opening includes at least a first opening and a second opening and the size of the first opening is larger than that of the second opening. The stepped opening of the solder mask layer can contain more pre-solder paste, thus increasing the bonding strength between the bump and the contact pad.
Abstract:
This invention relates to a substrate with via and pad structure(s) to reduce solder wicking. Each via and pad structure connects a component to conductive layers associated with the substrate. The substrate includes one or more plated vias, solder mask(s) surrounding the plated vias, and a conductive pad with a conductive trace connected to each plated via. The conductive pad extends beyond the terminal sides to increase solder formation and the solder mask reduces solder formation at the terminal end of the component. The via and pad structure is suitable for a variety of components and high component density. The invention also provides a computer implemented method for calculating the maximum distance of a conductive pad extending beyond the terminal side of a component.
Abstract:
A printed circuit board unit comprises an insulated film disposed between a printed circuit board and an electronic component so as to define a through hole for receiving the solder bump. The through hole may be designed to form a constriction in the solder bump. Electric connection can reliably be established between the printed circuit board and the electronic component since the solder bump is allowed to penetrate through the through hole in the insulated film. When the insulated film is brought away from the printed circuit board, the insulated film serves to tear the solder bump in two pieces at the constriction, so that the electronic component can easily be detached from the printed circuit board.
Abstract:
There is described a process for producing printed circuits comprising a laminar support, an electrically conductive track on the laminar support, and an auxiliary conductive element soldered to the conductive track. There is a provision to apply the auxiliary conductive element by means of an apparatus for applying SMD components.
Abstract:
A printed wiring board is provided in which lift-off and land peeling do not occur during soldering of an inserted component onto the printed wiring board, and hence pattern breakage does not occur, but with no increase in cost. A plurality of lands 6 are each formed continuously across surfaces of a substrate and an inner peripheral surface of one of a plurality of soldering through holes 5 into which leads 2 of an inserted component 3 to be mounted onto the printed wiring board are inserted before soldering is carried out, and a solder resist 8 is coated onto the lands 6.
Abstract:
A method of manufacturing a wiring board is provided. The method includes performing a plating process to a land, in a condition that a resist film having an opening for exposing at least the center of the land is formed on a substrate with wires having the land formed thereon, so that a fist portion of an edge of the opening is disposed on the substrate and a second portion of the edge is disposed on the land.
Abstract:
The present invention provides a solution to the problem of weakening bond integrity in integrated circuit devices due in part to test probes galling and weakening the interconnect pads during functional and reliability test probing. In doing so, the invention enables a lowering of the chance a bond wire or interconnect pad will be lifted during a wire bonding process or in normal operation of an integrated circuit device.
Abstract:
A method for depositing a solder layer or solder bump on a sloped surface. The method includes etching a sloped surface on a planar semiconductor substrate, depositing a solder-wettable layer on the sloped surface, masking the wettabler layer with a coating layer to control the position of the solder deposition, and using an organic film to prevent the solder from being deposited at regions not above either the wettable layer or the coating layer. Also, a semiconductor device structure on which a solder layer or solder bump is formed exclusively on a sloped surface.
Abstract:
A Ball Grid Array package having an increased fatigue life and improved conductive pad adhesion strength, as well as providing sufficient wiring space within the package, is disclosed. In particular, solder joints having a combination of mask-defined and pad-defined solder joint profiles are formed using a mask having non-circular elongated openings. The non-circular elongated openings of the mask have a major axis and a minor axis, such that the dimension of the openings along the major axis is greater than the diameter of the conductive pads, and the dimension of the openings along the minor axis is less than the diameter of the conductive pads. In addition, the major axis of the openings within the mask are selectively oriented in the direction of highest stress for each solder joint within the package, while providing ample wiring space therein.
Abstract:
A method of fabricating a solder bumped substrate for a flip-chip integrated circuit (IC) package is provided. The method includes the following steps. Providing a substrate material. Patterning a conductive layer on the substrate material that includes a plurality of circuit traces coupled to a plurality of bonding pads, wherein the bonding pads are arranged to correspond to input/output (I/O) pads on the flip-chip IC. Fabricating a solder mask layer over the conductive layer, wherein the solder mask layer defines a pad opening corresponding to each of the bonding pads, and wherein the pad openings defined by the solder mask layer are tapered such that each pad opening includes an expanded end and a tapered end. Printing solder onto a portion of each bonding pad that is exposed by the expanded end of the corresponding pad opening. Reflowing the printed solder to form solder bumps on each bonding pad.