Abstract:
To provide a substrate for mounting an element having good sulfurization resistance. A substrate 1 for mounting an element, comprising a low temperature co-fired ceramic substrate 2, a thick film conductor layer 3 made of a metal composed mainly of silver, which is formed on the surface of the low temperature co-fired ceramic substrate 2, a covering 4 made of a low temperature co-fired ceramic, which covers the edge portion 31 of the thick film conductor layer 3 and which is bonded to the low temperature co-fired ceramic substrate 2 on the outer side of the edge portion 31, and a plated layer 5 made of an electrically conductive metal, which is formed on the surface of the thick film conductor layer 3.
Abstract:
An electronic device includes a carrier, a surface mounting device, and solders. The carrier has a plurality of bonding pads, and at least one of the bonding pads has a notch, such that the bonding pad has a necking portion adjacent to the notch. The surface mounting device is disposed on the carrier. Besides, the surface mounting device has a plurality of leads, and each of the leads is connected to the necking portion of one of the bonding pads, respectively. The notch of each of the bonding pads is located under one of the leads. The solders connect the bonding pads and the leads.
Abstract:
A printed wiring board including an interlayer resin insulation layer, a pad formed on the interlayer resin insulation layer and for mounting an electronic component, a solder-resist layer formed on the interlayer resin insulation layer and the pad and having an opening portion over the pad, and a coating layer formed on the pad and exposed through the opening portion of the solder-resist layer. The solder-resist layer has a protruding portion protruding toward the inside of the opening portion in a bottom portion of the opening portion, and the protruding portion of the solder-resist layer has a flat surface in an end portion of the protruding portion.
Abstract:
A printed circuit board (PCB) ball grid array (BGA) system is provided. In one embodiment, the PCB BGA system includes a PCB, a PCB BGA pad formed on the PCB, a plated through-hole via disposed at least partially through the PCB proximate the PCB BGA pad, and a soldermask disposed over the PCB. The soldermask includes: (i) a BGA pad opening through which the PCB BGA pad is exposed, and (ii) a via opening through which a central portion of the plated through-hole via is exposed. The via opening has an inner diameter that is less than the outer diameter of the plated through-hole via.
Abstract:
Apparatus and methods for providing a package substrate and assembly for a flip chip integrated circuit. A substrate is provided having a solder mask layer, openings in the solder mask layer for conductive bump pads, and openings in the solder mask layer between the conductive bump pads exposing a dielectric layer underneath the solder mask layer. A flip chip integrated circuit is attached to the substrate using a thermal reflow to reflow conductive solder bumps on the integrated circuit to the conductive bump pads. An underfill material is dispensed beneath the integrated circuit and physically contacting the dielectric layer of the substrate. In additional embodiments, one or more integrated circuits are flip chip mounted to the substrate. The resulting assembly has improved thermal characteristics over the assemblies of the prior art.
Abstract:
A printed circuit board providing high reliability using a packaging of high capacity semiconductor chip, a semiconductor package, and a card and a system using the semiconductor package. The semiconductor package includes a substrate having a first surface and a second surface, a semiconductor chip mounted on the first surface of the substrate, at least one land disposed on the second surface of the substrate, and whose circumference includes a plurality of first group arcs, a mask layer covering the second surface of the substrate and including at least one opening that exposes the at least one land, and at least one external terminal disposed on the at least one land, wherein a portion of the at least one land is covered by the mask layer, and a sidewall of another portion of the at least one land is exposed by the at least one opening, and the circumference of the at least one opening includes a plurality of second group arcs, and a radius of the outermost arc from among the plurality of first group arcs is equal to a radius of the outermost arc from among the plurality of second group arcs.
Abstract:
A printed wiring board includes a wiring substrate, one or more conductor circuits provided on the wiring substrate, a solder resist layer provided on a surface of the wiring substrate and having multiple openings, the openings exposing multiple parts of the conductor circuits forming multiple conductor pads for mounting electronic parts, and multiple solder bumps formed on the conductor pads, respectively. The conductor pads are aligned at a pitch of about 200 μm or less, and a ratio W/D of a diameter W of the solder bumps to an opening diameter D of the openings formed in the solder resist layer is about 1.05 to about 1.7.
Abstract:
A multilayer ceramic substrate includes an inner layer portion and surface portions that sandwich the inner layer portion in the stacking direction and have an increased transverse strength because of the surface layer portion having a thermal expansion coefficient less than that of the inner layer portion. At least one of the surface portions covers peripheries of main-surface conductive films arranged on a main surface of an inner portion so as to leave central portions of the main-surface conductive films exposed, so that the main-surface conductive films function as via conductors, thereby eliminating the need to provide a via conductor in the surface portions.
Abstract:
In a build-up step, a plurality of resin insulation layers and a plurality of conductive layers are alternately laminated in multilayer arrangement on a metal foil separably laminated on a side of a base material, thereby forming a wiring laminate portion. In a drilling step, a plurality of openings are formed in an outermost resin insulation layer through laser drilling so as to expose connection terminals. Subsequently, in a desmear step, smears from inside the openings are removed. In a base-material removing step performed after the build-up step, the base material is removed and the metal foil is exposed.
Abstract:
Disclosed is a printed circuit board structure which is manufactured by providing a core board, forming an inner circuit layer on the core board surface, forming a bonding pad on the inner circuit, forming a ring-shaped anti-etching layer on the bonding pad, forming an anti-soldering insulation layer on the ring-shaped anti-etching layer and the bonding pad, and forming an opening to expose a part of the bonding pad, wherein the radius of the opening is shorter than the radius of the ring-shaped anti-etching layer, and the bonding pad surface is free of concave. The described structure may prevent the solder extending along the bottom void of the anti-soldering insulation layer to other regions.