Abstract:
A circuit board is provided that includes an outermost conductor layer including a plurality of terminals for flip-chip bonding and an outermost resin insulating layer defining a first opening and a second opening in an electronic-component mounting region. One of a power supply terminal and a ground terminal is exposed in the first opening. A plurality of signal terminals are exposed in the second opening. The resin insulating layer includes a reinforcing portion that defines an inner bottom surface of the second opening. A height of a portion of the terminal exposed in the first opening, the portion projecting from an inner bottom surface of the first opening, is greater than a height of portions of the terminals exposed in the second opening, the portions projecting from the inner bottom surface of the second opening.
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:
To provide a wiring substrate which can reliably prevent progress of cracking in a solder bump, and which exhibits improved reliability. The wiring substrate 10 of the present invention includes a substrate main body 11, pads 61, and a solder resist 81. The pads 61 are provided on the substrate back surface 13 of the substrate main body, and have surfaces 62 on which solder bumps 84 employed for connection of a motherboard 91 can be formed. The solder resist 81 covers the substrate back surface 13 of the substrate main body, and has openings 82 through which the pads 61 are exposed. A protrusion 71 is formed on a portion of the surface 62 of each pad 61. The height A4 of the end surface 72 of the protrusion 71, as measured from the surface 62 of the pad 61, is smaller than the depth of each opening 82. The protrusion 71 is provided in the opening 82 such that the peripheral surface 73 of the protrusion 71 faces the inner surface of the opening 82, and the protrusion 71 has a plan-view shape similar to that of the opening 82.
Abstract:
Embodiments of the present invention provide a wiring substrate which is excellent in terms of the reliability of connection between the wiring substrate and a semiconductor chip. In some embodiments the wiring substrate comprises a first build-up layer in which resin insulation layers and conductor layers are laminated alternately. The outermost conductor layer can include a plurality of connection terminal portions to which a semiconductor chip is flip-chip connected. The plurality of connection terminal portions can be exposed through openings of a solder resist layer. Each of the connection terminal portions includes a connection region to which a connection terminal of the semiconductor chip is to be connected, and a wiring region which extends in a planar direction from the connection region and which is narrower than the connection region. The surface of the wiring region has a solder wettability lower than that of the surface of the connection region.
Abstract:
Provided is a wiring substrate which allows connection terminals to be disposed at high density, can increase the degree of freedom of wiring layout, and can enhance the reliability of connection of the connection terminals. A wiring substrate of the present invention includes a laminate which includes one or more insulating layers and one or more conductor layers laminated together; a wiring formed on the laminate; a columnar connection terminal which is formed directly on the wiring and is in contact with at least one of opposite side surfaces of the wiring; and a solder resist layer which covers the wiring and which exposes at least a portion of the connection terminal. The width of the wiring at a position at which the connection terminal is formed is smaller than the length of the connection terminal in the width direction.
Abstract:
Embodiments of the present wiring substrate include a stacked body including one or more insulation layers and one or more conductive layers, wherein the wiring substrate has a plurality of connection terminals formed on the stacked body, each connection terminal has a top surface whose area is smaller than that of each of opposite side surfaces thereof, and a filling member provided in a filling manner between the connection terminals. The top surface of each connection terminal has an area larger than that of a portion of each side surfaces portion exposed from the filling member, and a bonding layer containing a solder is formed on the top surface.
Abstract:
A wiring board includes a base layer, a plurality of connection terminals and a surface layer. The base layer is electrically insulative. The plurality of connection terminals are conductive and formed on the base layer. The surface layer is electrically insulative, and fills gaps between the plurality of connection terminals on the base layer. The connection terminals include a base portion made of a conductive first metal and a coating portion made of a conductive second metal that is different from the first metal. The coating portion penetrates the surface layer, and coats the base portion to the base layer.