Abstract:
An external heat sink (2) may be soldered to a metal slug (3) incorporated at the bottom of a molded body (4) of encapsulating resin of the package of an integrated power device for surface mounting on printed circuit board (7). The metal slug (3) has at least a portion protruding from an outer surface of at least one face of the body (4); an external metal heat sink (2), geometrically coupling with the packaged device over the printed circuit board (7), has at least a surface abutting with a surface of the resin body (4) thus defining a separation gap (10) between at least a surface of said protruding portion of the metal slug (3) and a surface (5, 9a, 9b) opposed to it of the external metal heat sink (2) that gets filled with molten solder alloy (8) during the normal soldering treatment to which the board is subjected.
Abstract:
A semiconductor electronic device (1) is disclosed, which comprises a die (2) of a semiconductor material and a holder (3) connected electrically together by wire leads (4) of copper, the semiconductor material die being formed with a plurality of contact pads (6), the device being characterized in that it comprises a welding stud bump (7) of a metal material selected from a group comprising gold, palladium, and alloys thereof, formed on each contact pad of said plurality of contact pads, each copper wire lead (4) being welded with one end (4a) on a stud bump (7) and with the other end to said holder (3). This electronic device is highly reliable and can be fabricated simply at a low cost.
Abstract:
A method is described for removing residues of plastic (14) from metal parts (11, 12) of plastic packages of semiconductor devices, i.e. heat-sinks and terminals. The surfaces to be treated are subjected to pulsed laser radiation. The wavelength is chosen in such a way that residues of plastic in thin films have good transparency to the radiation and that the metal has a high absorption capacity in respect of the radiation. Moreover, the intensity and duration of application of the radiation are such as to cause the formation of plasma at the point of impact of the radiation with the surface to be treated.
Abstract:
A semiconductor electronic device (1) is disclosed, which comprises a die (2) of semiconductor material and a support (3), the die (2) of semiconductor material including an integrated electronic circuit and a plurality of contact pads (6) associated with the electronic circuit and connected electrically to the support (3) by wire leads (4), each contact pad of said plurality of contact pads (6) comprising a lower layer (7) of copper, or alloys thereof; and an upper layer. Advantageously, the upper layer consists of: a first film (9) of nickel or alloys thereof, overlying the lower layer (7) of copper or alloys thereof; a second film of palladium or alloys thereof, overlying the first film (9) of nickel or alloys thereof; and optionally a third film (10) of gold or alloys thereof, overlying the second film of palladium or alloys thereof. Moreover, the layer or film (9, 10) are deposited by an electroless chemical process.
Abstract:
The present invention relates to a method for manufacturing a fully moulded Multi Media Card package (5) obtained by laser cutting wherein at least some edges and the corners around the package have rounded profile and a sufficient smoothness for a safe handling. The method is defined by the following steps:
providing a rounded groove (4) on a substrate (2) back side (8) of the package, all around the package profile; cutting the edges of said package (5) by a laser cutting line (9) passing through said groove (4).
This new technique permits to use all the 24.0 mm width of the MMC package for the substrate 2, thus increasing the surface available for electronic components.
Abstract:
An electronic device is formed on a chip (11) of semiconductor material covered by a layer (12) of insulating material. Metal interconnection elements form, on the insulating layer (12), connection pads (13) to which a soldering material (14) is applied. To permit good heat dissipation, the device has a metal plate (30) partially incorporated in the insulating layer (12) and having a surface which is coplanar with the pads (13) and to which soldering material is applied (31).
Abstract:
A semiconductor electronic device (1) is disclosed, which comprises a die (2) of semiconductor material and a support (3), the die (2) of semiconductor material including an integrated electronic circuit and a plurality of contact pads (6) associated with the electronic circuit and connected electrically to the support (3) by wire leads (4), each contact pad of said plurality of contact pads (6) comprising a lower layer (7) of copper, or alloys thereof; and an upper layer. Advantageously, the upper layer consists of: a first film (9) of nickel or alloys thereof, overlying the lower layer (7) of copper or alloys thereof; and a second film (10) of gold or alloys thereof, overlying the first film (9) of nickel or alloys thereof. Moreover, the layer (7) or film (9, 10) are deposited by an electroless chemical process.