Abstract: The present invention relates to a substrate having optional circuits and a structure of flip chip bonding. The substrate includes a substrate body, at least one substrate pad, a first conductive trace and a second conductive trace. The substrate body has a surface. The substrate pad is disposed on the surface of the substrate body. The first conductive trace is connected to a first circuit, and has a first breaking area so it forms a discontinuous line. The second conductive trace is connected to a second circuit, and has a second breaking area so tit forms a discontinuous line. The second conductive trace and the first conductive trace are connected to the same substrate pad. Thus, the substrate can choose to connect different circuits, so the substrate can be applied to different products by connecting the desired circuit, thus reducing the manufacturing cost.

Abstract: A circuit board including a substrate, a conductive pattern and a solder mask layer is provided. The conductive pattern includes a pad, a tail trace and a signal trace. The tail trace connects with the edge of the pad and the signal trace connects with the edge of the pad. An angle between a portion of the signal trace neighboring the pad and the tail trace is larger than 0 degree and smaller than 180 degree. The solder mask layer is disposed on the substrate and covers a portion of conductive pattern. The solder mask layer has an opening exposing the whole pad.

Abstract: The present invention relates to a substrate having optional circuits and a structure of flip chip bonding. The substrate includes a substrate body, at least one substrate pad, a first conductive trace and a second conductive trace. The substrate body has a surface. The substrate pad is disposed on the surface of the substrate body. The first conductive trace is connected to a first circuit, and has a first breaking area so it forms a discontinuous line. The second conductive trace is connected to a second circuit, and has a second breaking area so tit forms a discontinuous line. The second conductive trace and the first conductive trace are connected to the same substrate pad. Thus, the substrate can choose to connect different circuits, so the substrate can be applied to different products by connecting the desired circuit, thus reducing the manufacturing cost.