Abstract:
Solder connections are created between the substrate of an electronic package and a circuit board having lengths that are longer than the width. The solder connections are created by locating solder balls of power or ground connections close enough to one another so that, upon reflow to the circuit board the solder balls combine, creating a larger solder connection. Signal solder balls (36c), however, remain separated. The power or ground solder balls (36a, 36b) on a particular bond pad (34a, 34b) are separated from one another by portions of a removable solder mask (100) that keep the solder balls spherical in shape during solder ball attachment to the electronic package (12). However, it is removed prior to reflow to the circuit board, thus creating a larger, longer solder connection between the electronic package and circuit board.
Abstract:
A circuit board, comprising a land (2) having a through hole (4) for inserting the lead (3) of an electronic part therein, wherein a lead (3) and the land (2) are mounted on the circuit board with lead-free solder (6), a solder resist (5) for protecting the circuit board (1) is formed so as to cover at least a part of a land outer peripheral end part (2a), i.e., at least the area of the land outer peripheral part (2a) liable to be subjected to the heat contraction of the solder to suppress the separation of the land and to cover the land outer peripheral end part on the side connected to a circuit formed in the circuit board and/or the end part on the side opposite to the end part on the side connected to the circuit.
Abstract:
A high density, non-bussed semiconductor package and a full body gold (FBG) method for manufacturing semiconductor packages are provided to improve electrical and mechanical connections with semiconductors and other electronic components and devices. The semiconductor package is fabricated by developing circuitry on the wire bond side of the semiconductor package prior to developing the ball attach side. The copper circuitry on the wire bond side is fully covered and protected from the environment. Solder masks are applied directly to the semiconductor substrat or copper layer to avoid contact with gold. The ball attach area is covered and protected by metallic layers, such as nickel and gold, or an organic solderable material to eliminate weak solder mask-gold connections.
Abstract:
A multilayer printed wiring board having a field via structure and having an excellent connection reliability between via holes. A lower-layer via hole (50) having a flat surface is formed by filling up an opening (42) provided in a lower interlayer resin insulating layer (40) with a plating metal (48), and an upper-layer via hole (70) is formed by providing an opening (62) in an upper interlayer resin insulating layer (60) of the via hole (50). Since the lower-layer via hole (50) has a flat surface and no resin is left on the surface, the connection reliability between the via hole (50) and the upper-layer via hole (70) is secured. In addition, since the surface of the via hole (50) is flat, the surface smoothness of the multilayer printed wiring board is not marred even when the upper-layer via hole (70) is formed on the via hole (50).
Abstract:
A method for mounting terminal on circuit board includes an applying process for applying solder paste (3) to a desired circuit board (1), a laying process for laying the connecting ends (4a) of terminals (4) having the connecting ends (4a) and non-connecting ends (4b) on the parts coated with the paste (3), and a heating process for melting the paste (3) for soldering the connecting ends (4a) to the board (1). In the applying process, a plurality of sets of solder paste applying parts (3a-3d) which are separated from each other are provided on the board (1). In the laying process, each connecting end (4a) is laid across each set of parts (3a-3d).
Abstract:
Die Erfindung betrifft ein Verfahren zum lötenden Verbinden zumindest eines elektronischen Bauteils (104, 204, 304, 404, 504) mit einer Trägerplatte (100, 200, 300, 400, 500), wobei die Trägerplatte zumindest eine Trägerplattenkontaktfläche (102, 202, 302, 402, 502) und das zumindest eine elektronische Bauteil zumindest eine dazu korrespondierende Bauteilkontaktfläche (105) aufweist, wobei die zumindest eine Trägerplattenkontaktfläche von einer Lötstopplackschicht (101, 201, 301, 401, 401) umgeben ist, die die zumindest eine Trägerplattenkontaktfläche begrenzt, wobei das Verfahren die folgenden Schritte aufweist: a) zumindest bereichsweises Aufbringen von Lotpaste (106, 206, 306, 406, 506) auf die Lötstopplackschicht (101, 201, 301, 401, 501) und in minimaler Überlappung mit der an die Lötstopplackschicht angrenzenden Trägerplattenkontaktfläche (102, 202, 302, 402, 502), b) Bestücken der Trägerplatte mit dem zumindest einen elektronischen Bauteil (104, 204, 304, 404, 504, wobei die zumindest eine Bauteilkontaktfläche (105) die dazu korrespondierende zumindest eine Trägerplattenkontaktfläche (102, 202, 302, 402, 502) zumindest teilweise überdeckt, und c) Erhitzen der Lotpaste (106, 206, 306, 406, 506) zum Herstellen einer gelöteten Verbindung zwischen der Trägerplatte und dem zumindest einem Bauteil.