摘要:
A printed circuit board and a method for fabricating the same is provided. A substrate having a core layer and a plurality of pairs of bond pads thereon is prepared with at least one opening formed on the core layer between each pair of the bond pads. A solder mask layer covers the core layer and fills the openings, with recessed portions formed at positions of the solder mask layer on the openings during curing of the solder mask layer. When a small passive component is mounted on the printed circuit board, a space is formed between the bottom of the passive component and the recessed portions of the solder mask layer. An encapsulating resin can flow into the space to form an insulating barrier between the bond pads to prevent bridging between the bond pads and short circuiting of the passive component.
摘要:
A warpage preventing substrate is provided. A plurality of first and second conductive traces are respectively formed on a first surface and a second surface of a core layer of the substrate, each conductive trace having a terminal, and a plurality of first and second non-functional traces are respectively formed on the first and second surfaces of the core layer at area free of the conductive traces. The first non-functional traces are arranged in different density from the second non-functional traces in a manner that, stress generated from the first conductive traces and first non-functional traces counteracts stress generated from the second conductive traces and second non-functional traces, to thereby prevent warpage of the substrate and maintain flatness of the substrate.
摘要:
A and method for fabricating a warpage-preventive circuit board is provided, wherein a plurality of conductive traces are formed on a surface of an electrically-insulative core layer, and a plurality of discontinuous dummy circuit regions are disposed on the surface of the electrically-insulative core layer at area free of the conductive traces, with adjacent dummy circuit regions being spaced apart by at least a chink. During a high-temperature fabrication process, the dummy circuit regions help reduce thermal stress and the chinks absorb thermal expansion of the dummy circuit regions, to thereby prevent warpage of the circuit board and cracks of a chip mounted on the circuit board, such that yield and reliability of fabricated semiconductor devices can be improved.
摘要:
A warpage-preventive circuit board and method for fabricating the same is provided, wherein a plurality of conductive traces are formed on a surface of an electrically-insulative core layer, and a plurality of discontinuous dummy circuit regions are disposed on the surface of the electrically-insulative core layer at area free of the conductive traces, with adjacent dummy circuit regions being spaced apart by at least a chink. During a high-temperature fabrication process, the dummy circuit regions help reduce thermal stress and the chinks absorb thermal expansion of the dummy circuit regions, to thereby prevent warpage of the circuit board and cracks of a chip mounted on the circuit board, such that yield and reliability of fabricated semiconductor devices can be improved.
摘要:
A warpage-preventive circuit board and method for fabricating the same is provided, wherein a plurality of conductive traces are formed on a surface of an electrically-insulative core layer, and a plurality of discontinuous dummy circuit regions are disposed on the surface of the electrically-insulative core layer at area free of the conductive traces, with adjacent dummy circuit regions being spaced apart by at least a chink. During a high-temperature fabrication process, the dummy circuit regions help reduce thermal stress and the chinks absorb thermal expansion of the dummy circuit regions, to thereby prevent warpage of the circuit board and cracks of a chip mounted on the circuit board, such that yield and reliability of fabricated semiconductor devices can be improved.
摘要:
A semiconductor package with a chip supporting member is provided, including a lead frame having a die pad and a plurality of leads, and a chip supporting member mounted on a central portion of the die pad. The chip supporting member has a first surface and an opposing second surface attached to the die pad. At least a chip is mounted on the first surface of the chip supporting member to space the chip apart from the die pad via the chip supporting member, so as to prevent the chip from being damaged by thermal stress induced by CTE (coefficient of thermal expansion) mismatch between the chip and lead frame, thereby eliminating delamination, warpage and chip cracks. Moreover, the chip supporting member interposed between the chip and die pad provides greater flexibility for mounting variously sized or shaped chips on the die pad without having to use chips corresponding to profile of the die pad.
摘要:
A laminating device (230) and method are disclosed for laminating semiconductor die (220) on substrates on a panel (200) of substrates. The laminating device (230) includes lamination units (234,236,238,240) that operate independently of each other so that a row or column of semiconductor die (220) may be independently laminated onto a row or column of substrates simultaneously.
摘要:
A memory device is disclosed including at least one surface pre-treated to roughen the surface for better adhesion of ink on the surface. The surface of the memory device may be pre-treated by scoring lines in the surface with a laser or by forming discrete deformations with a particle blaster. The surface may also be roughened by providing a roughened pattern on a mold plate during an encapsulation process. In further examples, the surface may be chemically pre-treated to roughen the surface and/or increase the adhesion energy of the surface.
摘要:
A semiconductor package having a low profile is disclosed. In embodiments, a surface mounted component may be mounted directly to the core of the semiconductor package substrate, so that there is no conductive layer, plating layers or solder paste between the component and the substrate core. The surface mounted component may be any type of component which may be surface mounted on a substrate according to an SMT process, including for example passive components and various packaged semiconductors.
摘要:
A flash memory card and methods of manufacturing same are disclosed. The card includes a semiconductor package fabricated to receive a single-sided or double-sided lid. A surface of the semiconductor package may be formed with holes, trenches and/or pockmarks. After the holes, trenches and/or pockmarks are formed, a lid may be attached to the package surface in an injection molding process. During the injection molding process, the molten plastic flows into the holes, trenches and/or pockmarks to interconnect with the surface of the semiconductor package. Thus, when the molten plastic hardens, the holes, trenches and/or pockmarks ensure that the lid remains firmly attached to semiconductor package.