Abstract:
La présente invention concerne un dispositif électronique (10) comprenant une carte de circuit imprimé (12) portant au moins un composant comprenant au moins un composant de puissance (14) et/ou au moins un conducteur de puissance (18), ladite carte de circuit imprimé comportant une succession en alternance de couches isolantes (22) et conductrices (24), des puits (30, 30') portant un revêtement intérieur conducteur électriquement et thermiquement (32) et traversant l'épaisseur de la carte, et un dispositif de refroidissement (34) de la carte. Selon l'invention, l'intérieur du puits est rempli en outre d'une matière thermiquement conductrice (44) pour réaliser un pont thermique entre le composant et le dispositif de refroidissement (34).
Abstract:
In some embodiments, to increase the height-to-pitch ratio of a solder connection that connects different structures with one or more solder balls, only a portion of a solder ball's surface is melted when the connection is formed on one structure and/or when the connection is being attached to another structure. In some embodiments, non-solder balls are joined by an intermediate solder ball (140i). A solder connection may be surrounded by a solder locking layer (1210) and may be recessed in a hole (1230) in that layer. Other features are also provided.
Abstract:
The present patent application relates to a production process of printed circuits on which electronic components without leading wire situated on the opposite side with respect to the circuit printed side are soldered. In particular, the said process provides for drilling the support (10), rolling it with a layer of conductive material (20) on only one (10a) of the two sides (10a and 10b) and making the circuits on the said side (10a).
Abstract:
The initial intention in the semi-finished product of the invention is to provide a functional separation between the requirement for mechanical strength and the previously concomitant requirement, for completing a circuit, in order to bring the pure circuit connection, especially for signals, "closer" to the electrical and technical properties of chips. To do this, the layout miniaturisation is optimised without regard for the mechanical strength of the substrate. Instead of a printed circuit board (MCM), a semi-finished product which can be developed into a printed circuit board is made. The semi-finished product of the invention consists of an extremely thin film (8) with a plurality of extremely small holes (14) made simultaneously by an etching process. The hole diameters can be reduced by almost an order of magnitude (down to 20 mu m), facilitating, for instance, definite sub-100 mu m technology. Such a semi-finished product (19) does not act as a mechanical support but is designed only for signal conduction. The semi-finished product (19) which carries the densely packed wiring pattern, is bonded to a not densely packed power supply plane (22) acting as the service plane and the printed circuit board thus made is finally secured to a mechanical support (20).
Abstract:
In some embodiments, to increase the height-to-pitch ratio of a solder connection that connects different structures with one or more solder balls, only a portion (510) of a solder ball's (140) surface is melted when the connection is formed on one structure (110) and/or when the connection is being attached to another structure (HOB). The structure (110) may be an integrated circuit, an interposer, a rigid or flexible wiring substrate, a printed circuit board, some other packaging substrate, or an integrated circuit package. In some embodiments, solder balls (140.1, 140.2) are joined by an intermediate solder ball (140i), upon melting of the latter only. Any of the solder balls (140, 140i) may have a non-solder central core (140C) coated by solder shell (140S). Some of the molten or softened solder may be squeezed out, to form a "squeeze-out" region (520, 520A, 520B, 520.1, 520.2). In some embodiments, a solder connection (210) such as discussed above, on a structure (110A), may be surrounded by a dielectric layer (1210), and may be recessed in a hole (1230) in that layer (1210), to help in aligning a post (1240) of a structure (HOB) with the connection (210) during attachment of the structures (110A, HOB). The dielectric layer (1210) may be formed by moulding. The dielectric layer may comprise a number of layers (1210.1, 1210.2), "shaved" (partially removed) to expose the solder connection (210). Alternatively, the recessed solder connections (210) may be formed using a sublimating or vapourisable material (1250), placed on top of the solder (210) before formation of the dielectric layer (1210) or coating solder balls (140); in the latter case, the solder (140C) sinks within the dielectric material (1210) upon removal of the material (1250) and subsequent reflow. The solder connections (210.1, 210.2) may be used for bonding one or more structures (HOB, HOC) (e.g. an integrated circuit die or wafer, a packaging substrate or a package) to a structure (110A) (a wiring substrate) on which a die (HOB) is flip-chip connected. The solder connections (210.1, 210.2) may differ from each other, in particular in height.
Abstract:
Es wird eine Leiterplatte und ein Verfahren zu deren Herstellung vorgeschlagen, die eine effektive und trotzdem kostengünstige Entwärmung von auf der einen Seite der Leiterplatte angeordneten elektrischen Bauteilen, deren zu entwärmende Abwärme auf die andere Seite der Leiterplatte abzuleiten ist, unterstützen. Bezüglich der Leiterplatte wird dies dadurch erreicht, dass die Leiterplatte mit Lötzinn gefüllten Durch-kontaktierungen ausgestattet ist, die die zu entwärmende Abwärme von der einen Seite der Leiterplatte auf die andere ableiten. Bezüglich des Verfahrens zur Herstellung der erfindungsgemäßen Leiterplatte wird dies dadurch gelöst, dass die für die Entwärmung vorgesehenen Durchkontaktierungen der Leiterplatte mit Lotpaste bedruckt und in einem nachfolgenden Lötprozess mit Lötzinn gefüllt werden.
Abstract:
L'invention concerne un module électronique (100) comprenant un empilement de n boîtiers (10, 10a, 10b) d'épaisseur E prédéterminée, pourvus sur une surface inférieure de billes de connexion (12) d'épaisseur e b prédéterminée reliées à un circuit imprimé (20, 20a, 20b) d'interconnexion du boîtier. Le circuit imprimé est disposé sur la surface inférieure du boîtier au niveau des billes, présente des percements métallisés (23) dans lesquels sont situées les billes (12) et auxquels elles sont connectées, et a une épaisseur e ci inférieure à e b , de manière à obtenir un module d'épaisseur totale ne dépassant pas n (E+ 10% e b ).
Abstract:
A circuit board (1) having a pad (7) and a through hole (2a). When a surface-mount component (6) is mounted on the circuit board (1) by soldering, a lead (5) of the surface-mount component (6) is solder to the pad (7), and an alloy layer composed of a part of elements constituting the solder (8), the pad (7), and the lead (5) is formed at the soldering part of the lead (5) and the pad (7). The through hole (2a) connected to the lead (5) is made of nickel or palladium having a thermal conductivity of 100 W/m•k or less. Since the amount of heat transferred to the soldering part through the through hole (2a) is reduced and therefore the temperature of the soldering part is maintained below the melting point of the alloy layer, the interface of the soldering part is prevented from separating when the back of the circuit board (1) is solder-reflowed after the mounting. Thus the reliability of connection between the lead (5) and the pad (7) is improved.