Abstract:
The invention relates to a method for producing an electrical via between one or more electrical or electronic components (10) and a circuit board (16). First, a conductive polymer layer (42) is applied to soldering tips (46) of connecting wires (12) over part of the surface or over the full surface thereof. At least one electrical or electronic component is joined to the circuit board (16) in a THT process. At least one solder connection is produced between the circuit board (16) and connecting wires (12) of the at least one electrical or electronic component (10) by means of selective soldering or a solder wave (28).
Abstract:
A lighting device for a lamp device is provided. The lighting device comprises a circuit board and film capacitors, packaged on the circuit board by using leadless flow solders, wherein each film capacitor comprises polypropylene films and lead wires, and a material of the lead wires has a thermal conductivity lower than a thermal conductivity of copper, and terminals and internal materials of the film capacitors are leadless, wherein the film capacitors are constructed by a combination of a polypropylene film and an aluminum foil, or by an aluminum-deposited polypropylene film, and wherein a cross-sectional area of the film capacitors is 35 mm 2 or less, and a temperature at a terminal end of the lead wires in the film capacitors during a soldering process is 130°C or less.
Abstract:
A method for reducing whisker formation and preserving solderability in tin coatings over metal features of electronic components. The tin coating has internal tensile stress and is between about 0.5 m and about 4.0 m in thickness. There is a nickel-based layer under the tin coating.
Abstract:
Provided are a bonded structure by a lead-free solder and an electronic article comprising the bonded structure. The bonded structure has a stable bonding interface with respect to a change in process of time, an enough strength and resistance to occurrence of whiskers while keeping good wettability of the solder. In the bonded structure, a lead-free Sn-Ag-Bi alloy solder is applied to an electrode through an Sn-Bi alloy layer. The Sn-Bi alloy, preferably, comprises 1 to 20 wt% Bi in order to obtain good wettability of the solder. In order to obtain desirable bonding characteristics having higher reliability in the invention, a copper layer is provided under the Sn-Bi alloy layer thereby obtaining an enough bonding strength.
Abstract:
Products and assemblies are provided for socketably receiving elongate interconnection elements, such as spring contact elements, extending from electronic components, such as semiconductor devices. Socket substrates are provided with capture pads for receiving ends of elongate interconnection elements extending from electronic components. Various capture pad configurations are disclosed. A securing device such as a housing positions the electronic component securely to the socket substrate. Connections to external devices are provided via conductive traces adjacent the surface of the socket substrate. The socket substrate may be supported by a support substrate. In a particularly preferred embodiment the capture pads are formed directly on a primary substrate such as a printed circuit board.
Abstract:
The present invention provides an apparatus (30) for forming a solder wicking prevention zone operating when a connector member with a connector is processed using molten solder, to hinder the solder from spreading to a contact site of the connector in a wettable manner. The apparatus includes a main forming agent tank (34) which stores a main forming agent used to form the solder wicking prevention zone, an ejection nozzle (38), in particular an ink jet printer, which ejects the main forming agent stored in the main forming agent tank (34), and a direction control section (46) which controls an ejection direction of the main forming agent ejected by the ejection nozzle (38). The direction control section (46) controls the ejection direction of the main forming agent ejected by the ejection nozzle (38), so as to apply the main forming agent to a predetermined position on the connector member to form the solder wicking prevention zone.
Abstract:
Provided are a bonded structure by a lead-free solder and an electronic article comprising the bonded structure. The bonded structure has a stable bonding interface with respect to a change in process of time, an enough strength and resistance to occurrence of whiskers while keeping good wettability of the solder. In the bonded structure, a lead-free Sn-Ag-Bi alloy solder is applied to an electrode through an Sn-Bi alloy layer. The Sn-Bi alloy, preferably, comprises 1 to 20 wt% Bi in order to obtain good wettability of the solder. In order to obtain desirable bonding characteristics having higher reliability in the invention, a copper layer is provided under the Sn-Bi alloy layer thereby obtaining an enough bonding strength.
Abstract:
A lead-free solder alloy of electrode for joining electronic parts fine in texture and excellent in thermal fatigue resistant characteristic is presented. This is a solder alloy of electrode for joining electronic parts comprising Sn, Ag and Cu as principal components, and more particularly a solder alloy of electrode for joining electronic parts containing 92 to 97 wt.% of Sn, 3.0 to 6.0 wt. % of Ag, and 0.1 to 2.0 wt. % of Cu. By adding a small amount of Ag to the solder mainly composed of Sn, a fine alloy texture is formed, and texture changes are decreased, so that an alloy excellent in thermal fatigue resistance is obtained. Further, by adding a small amount of Cu, an intermetallic compound is formed, and the junction strength is improved.