Abstract:
A method and a device for enhancing the solderability of a lead-free component are provided. The provided method is compatible with the conventional soldering process and is capable of improving the wetting ability of the solder so as to enhance the solderability and the ability of anti-oxidation thereof. Besides, it is also achievable for providing a recognizable lead-free device so as to prevent the process confusion.
Abstract:
Solder compositions, solder pastes and methods of manufacturing thereof having a solder material coated with a coating material by an immersion coating process or an electroless plating process. The solder composition and solder pastes are substantially lead-free and have melting temperatures approaching those of traditional tin-lead solders.
Abstract:
A method for depositing solder bumps on a circuit substrate. The method comprises forming a dielectric layer on the circuit substrate which includes a plurality of conductive regions. The dielectric layer is patterned and opened to expose the conductive regions. A solder bump is disposed on each of the conductive regions, and a barrier layer is disposed on each of the solder bumps. Subsequently, the method includes forming a second solder bump on each of the first solder bumps. In an alternative method, solder bumps are initially disposed on each of the conductive regions and are then covered with a dielectric material. Subsequently, the dielectric material and a portion of the solder bumps are removed, and a barrier layer is disposed on each of the remaining structures of the solder bumps. The second solder bump material may then be disposed on the barrier layer. The articles produced by the methods of the present invention include semiconductor substrates or wafers having stacked solder bumps.
Abstract:
A material for an electronic component having a plating layer A formed of metals X and Y mixed with each other on a base metal material and a coating layer B formed of the metal X provided on the plating layer A is provided, whereby wettability of soldering is satisfactory ensured, degradation of solderability and appearance is prevented and generation of whiskers can also be prevented.
Abstract:
An integrated solder preform array is composed of a metal or metal alloy suitable for use in a soldering or bonding process. The preform includes a series of discrete solder islands disposed in a desired matrix. Each island contains a hole for receiving a pin, and bridging strands for joining each of said islands in a matrix. The bridging strands are formed of the same solder material as the islands, with the solder preform containing a substantially uniform coating of tin over its entire outer surface for the purpose of improving solder wetting and therefore elimination of unwanted shorting of circuits and other electrical components being soldered.
Abstract:
A tape useful for an automatic bonding process when manufacturing a high-frequency semiconductor device, the tape comprising an insulating flexible film, and circuit patterns consisting of copper or copper-alloy formed on the insulating film, each of the circuit patterns having inner and an outer lead portions. A tin or tin-lead plated film is formed on the pattern, and an intermediate plated film is formed on at least the outer lead portion as an underlayer. The intermediate plated film consists of a metal or metal alloy selected from nickel, cobalt, gold, silver, platinum, palladium, indium or rhodium.
Abstract:
In a method of soldering for use in fabricating electronic circuit device, after an oxide layer and/or contaminated layer on a surface of a soldering material and members to be soldered thereby is removed by sputter-cleaning with atom or ion, the members are aligned in an oxidizing atmosphere within a predetermined time period and, then, the soldering material is heated in non-oxidizing atmosphere to performe soldering. An apparatus for performing the above method comprises a sputter cleaning device, an alignment device operable in atmospheric condition and a heating and soldering device in the form of a belt furnace operable in non-oxidizing or reducing environment. Instead of the sputter cleaning device, a mechanical polishing or cutting device can be used to cleaning a surface of solder or a member to be bonded or a solder ball plated with gold may be used. An alignment between two members to be bonded is provided by an alignment mark means which comprises a protrusion on a surface of one member and a complimental recess formed at a center portion of a protrusion means formed on a corresponding surface of the other member.
Abstract:
Electrically conductive patterns on opposite sides of a printed circuit board are connected by way of through holes formed in the board. A plug formed of fusible material such as solder and having an electrically conductive coating is located in the or each hole. The plug is upset to expand it so that the electrically conductive coating contacts the wall of the hole. Solder is applied to opposite ends of the plug to bridge any gap between the conductive pattern and the conductive coating. The body of the plug may then be removed by a desoldering step.