Abstract:
A technique for defining a wettable solder joint area for an electronic assembly reduces and/or dispenses with the use of polymer solder masks. According to the technique, a substrate (112) is provided that includes at least one conductive trace (116). A nickel layer (118) is provided on the conductive trace (116) and gold is selectively applied on the nickel layer (118) in a desired pattern to form a gold layer (120). An exposed portion of the nickel layer (118) that does not include the gold in the desired pattern is then oxidized. Finally, a solder (122) is applied to the gold layer (120), with the oxidized nickel layer (118) providing a solder stop and defining a wettable solder joint area.
Abstract:
Surface mounting of components includes providing a substrate (10) that has a first surface and a second surface. A portion of the first surface is coupled to a conductive layer (20) that is patterned. A compliant layer (50) is introduced to the first surface of the substrate (10) and to the conductive layer (20). At least one aperture is formed in the compliant layer (50) which extends to the surface of the conductive layer (20). Conductive material is introduced into the aperture(s). Solder couples the surface mount component (90) to the compliant layer (50).
Abstract:
A technique for defining a wettable solder joint area for an electronic assembly reduces and/or dispenses with the use of polymer solder masks. According to the technique, a substrate (112) is provided that includes at least one conductive trace (116). A nickel layer (118) is provided on the conductive trace (116) and gold is selectively applied on the nickel layer (118) in a desired pattern to form a gold layer (120). An exposed portion of the nickel layer (118) that does not include the gold in the desired pattern is then oxidized. Finally, a solder (122) is applied to the gold layer (120), with the oxidized nickel layer (118) providing a solder stop and defining a wettable solder joint area.
Abstract:
Surface mounting of components includes providing a substrate (10) that has a first surface and a second surface. A portion of the first surface is coupled to a conductive layer (20) that is patterned. A compliant layer (50) is introduced to the first surface of the substrate (10) and to the conductive layer (20). At least one aperture is formed in the compliant layer (50) which extends to the surface of the conductive layer (20). Conductive material is introduced into the aperture(s). Solder couples the surface mount component (90) to the compliant layer (50).