Patent ID: 7642130
Filing Date: 2010-01-05
Classification: H01L,H05K,Y10T

Abstract:
1. A manufacturing method of a wiring substrate on which a bonding pad for wire bonding connection and a flip chip pad for flip chip connection in which solder is deposited on a surface are juxtaposed, the method comprising steps of: forming metal surfaces for the flip chip pad and the bonding pad with different metals; immersion-treating the substrate with a first adhesive treatment liquid, the first adhesive treatment liquid including an adhesive giving compound for reacting with the metal surfaces and giving adhesion properties and being adjusted to a pH value for selectively forming an adhesive layer on each metal surface of each pad; attaching a solder powder to the adhesive layer formed on each metal surface of each pad; immersion-treating the substrate immersion-treated with the first adhesive treatment liquid with a second adhesive treatment liquid, the second adhesive treatment including an adhesive giving compound for reacting with the metal surfaces and giving adhesion properties and being adjusted to a pH value capable of forming an adhesive layer on the metal surface of the flip chip pad while peeling the adhesive layer formed on the metal surface of the bonding pad, the pH value of the second adhesive treatment liquid being adjusted so as to become higher than the pH value of the first adhesive treatment liquid; attaching a solder powder to the adhesive layer formed on only the metal surface of the flip chip pad; and forming a solder layer with which the metal surface of the flip chip pad is covered by melting the solder powder by reflow.