Abstract: The present general inventive concept includes a wave soldering apparatus, a soldering method using the wave soldering apparatus, and a method of forming a solder bump for a flip chip. The wave soldering apparatus includes a solder bath containing a molten solder. A nozzle is arranged in the solder bath so as to upwardly spout the molten solder toward a bottom surface of a substrate that passes an upper portion of the solder bath. A liquid that is separated from the molten solder is contained in a downstream area of the solder bath, and buoyancy is applied to the molten solder, which is adhered to the substrate, by the liquid. Since the amount of the molten solder adhered to the substrate is increased by the buoyancy, it is possible to form the solder bump to have a height sufficient to use it as a flip chip.

Abstract: A method of forming at least one bonding structure may be provided. A ball may be formed on the front end of a wire outside a capillary. The capillary may be moved downwardly to form a preliminary compressed ball on a first pad using the ball. The capillary may be moved upwardly to form a neck portion on the preliminary compressed ball using the preliminary compressed ball and the wire. The capillary may be moved obliquely and downwardly to form a compressed ball. The capillary may extend the wire from the compressed ball to a second pad.

Abstract: A printed circuit board and method thereof and a solder ball land and method thereof. The example printed circuit board (PCB) may include a first solder ball land having a first surface treatment portion configured for a first type of resistance and a second solder ball land having a second surface treatment portion configured for a second type of resistance. The example solder ball land may include a first surface treatment portion configured for a first type of resistance and a second surface treatment portion configured for a second type of resistance. A first example method may include first treating a first surface of a first solder ball land to increase a first type of resistance and second treating a second surface of a second solder ball land to increase a second type of resistance other than the first type of resistance.

Abstract: A method of forming at least one bonding structure may be provided. A ball may be formed on the front end of a wire outside a capillary. The capillary may be moved downwardly to form a preliminary compressed ball on a first pad using the ball. The capillary may be moved upwardly to form a neck portion on the preliminary compressed ball using the preliminary compressed ball and the wire. The capillary may be moved obliquely and downwardly to form a compressed ball. The capillary may extend the wire from the compressed ball to a second pad.

Abstract: A printed circuit board and method thereof and a solder ball land and method thereof. The example printed circuit board (PCB) may include a first solder ball land having a first surface treatment portion configured for a first type of resistance and a second solder ball land having a second surface treatment portion configured for a second type of resistance. The example solder ball land may include a first surface treatment portion configured for a first type of resistance and a second surface treatment portion configured for a second type of resistance. A first example method may include first treating a first surface of a first solder ball land to increase a first type of resistance and second treating a second surface of a second solder ball land to increase a second type of resistance other than the first type of resistance.

Abstract: A printed circuit board and method thereof and a solder ball land and method thereof. The example printed circuit board (PCB) may include a first solder ball land having a first surface treatment portion configured for a first type of resistance and a second solder ball land having a second surface treatment portion configured for a second type of resistance. The example solder ball land may include a first surface treatment portion configured for a first type of resistance and a second surface treatment portion configured for a second type of resistance. A first example method may include first treating a first surface of a first solder ball land to increase a first type of resistance and second treating a second surface of a second solder ball land to increase a second type of resistance other than the first type of resistance.

Abstract: In a lead-free solder, a semiconductor package and a method of manufacturing the semiconductor package, the lead-free solder includes about 3.5 percent by weight to about 6 percent by weight of silver, about 0.05 percent by weight to about 0.5 percent by weight of copper and a remainder of tin. The lead-free solder is employed in the semiconductor package. The lead-free solder has high impact resistance and high heat resistance to reduce failures of the semiconductor package.

Abstract: A method of cleaning a board includes dipping a board having a surface on which an organic solderability preservative (OSP) is provided into a cleaning solution having glycolic acid, a surfactant and water.

Abstract: A substrate for a semiconductor package and a method of manufacturing the same are provided. More particularly, the substrate for the semiconductor package and the method for manufacturing the same include metal pieces, with some of the metal pieces having one end embedded within an insulating layer for insulating an external connection electrode of the substrate and the other end embedded within a solder. The substrate for the semiconductor package has the effects of preventing or retarding a connection failure in a solder connection portion by blocking or retarding the propagation of a crack, and allowing a solder to be easily permeated under the metal pieces and formed at a desired position.

Abstract: A printed circuit board and method thereof and a solder ball land and method thereof. The example printed circuit board (PCB) may include a first solder ball land having a first surface treatment portion configured for a first type of resistance and a second solder ball land having a second surface treatment portion configured for a second type of resistance. The example solder ball land may include a first surface treatment portion configured for a first type of resistance and a second surface treatment portion configured for a second type of resistance. A first example method may include first treating a first surface of a first solder ball land to increase a first type of resistance and second treating a second surface of a second solder ball land to increase a second type of resistance other than the first type of resistance.

Abstract: A contact pin a connection device, and a method of testing. The contact pin may include a barrel (for example, a cylindrical barrel) having a screw thread on an inside wall, a contact tip formed at an end of the barrel, a spring located inside the barrel and having an end connected to the contact tip, a plunger formed at the other end of the barrel and connected to the other end of the spring, and at least one screw moving together with the screw thread. The plunger and/or the contact tip may have at least one screw, moving together with the screw thread.

Abstract: A contact pin a connection device, and a method of testing. The contact pin may include a barrel (for example, a cylindrical barrel) having a screw thread on an inside wall, a contact tip formed at an end of the barrel, a spring located inside the barrel and having an end connected to the contact tip, a plunger formed at the other end of the barrel and connected to the other end of the spring, and at least one screw moving together with the screw thread. The plunger and/or the contact tip may have at least one screw, moving together with the screw thread.