Abstract:
An apparatus and a method is described to provide a printed wiring board which includes a substrate (10) having electrical contact pads (12) disposed over a surface of the substrate, with the contacts having a patterned solder mask (14) with an aperture (14') that exposes less than the entire surface of the electrical contact pads (12). Thus by providing a soldermask aperture (14') that exposes less than the entire surface of the contact (12), the aperture (14') can be used to completely contain liquid solder material (16) from the solder reflow attach operation.
Abstract:
For the tape BGA package according to this invention use is made of a transparent base film (9). Such a base film (9) has a device hole (2) to which is inserted a semiconductor chip (4), and a plurality of pads (3) arranged in matrix from and wirings (101) for connecting these plurality of pads (3) to the electrodes of the semiconductor chip (4) are formed on the base film (9). Further, a transparent cover resist (7) is applied to the entire surface of the base film (9) except for the top portions of the plurality of pads (3), and spherical bumps (11) are formed respectively on the plurality of pads (3). With this arrangement, it is possible to inspect by visual observation the bonding conditions between the bumps (11) and the outer lead bonding pads (12) on a printed circuit board (13) even after the package is mounted on the printed circuit board (13).
Abstract:
Die Erfindung betrifft ein Verfahren (20) zur Herstellung einer elektrischen Schaltung (2), bei dem ein Schaltungsträger (4) mit einer ersten Kontaktfläche (14) und mit einer zweiten Kontaktfläche (16) bereitgestellt wird. Ein Isolationskörper (26) wird auf den Schaltungsträger (4) aufgebracht, wobei der Isolationskörper (26) die erste Kontaktfläche (14) und die zweite Kontaktfläche (16) zumindest teilweise überdeckt, und wobei der Isolationskörper (26) im Bereich der beiden Kontaktflächen (14, 16) jeweils eine Aussparung (34) aufweist. In den Isolationskörper (26) wird ein fließfähiges elektrisches Leitmedium (44) eingefüllt. Die Erfindung betrifft ferner eine elektrische Schaltung (2) und ein weiteres Verfahren (60) zur Herstellung einer elektrischen Schaltung (2).
Abstract:
In an example embodiment, a circuit interconnect includes a first printed circuit board (PCB), a second PCB, a spacer, and an electrically conductive solder joint. The first PCB includes a first electrically conductive pad. The second PCB includes a second electrically conductive pad. The spacer is configured to position the first PCB relative to the second PCB such that a space remains between the first PCB and the second PCB after the first electrically conductive pad and the second electrically conductive pad are conductively connected in a soldering process. The electrically conductive solder joint conductively connects the first electrically conductive pad and the second electrically conductive pad.
Abstract:
A package for storing a semiconductor element mounted on an upper surface of a substrate (52) is configured by a substrate (52) and a conductive cap (54). A grounding electrode (57) is annularly formed on an upper surface outer circumferential section of the substrate (52). An upper surface of an inner circumferential section of the grounding electrode (57) is covered with a solder resist (67). On an outer circumference lower end surface of the conductive cap (54), a flange (70) substantially horizontally bent is formed. The conductive cap (54) is arranged on the upper surface of the substrate (52), and a lower surface of the flange (70) is permitted to abut to an upper surface of the solder resist (67). Furthermore, on a further outer circumferential side from the solder resist (67), a space formed between the lower surface of the flange (70) and the grounding electrode (57) is filled with a conductive bonding member (73), and the conductive cap (54) is bonded to the substrate (52).