Volentine & Whitt, P.L.L.C.
Substrate structure having N-SMD ball pads
A substrate structure having non-solder mask design (N-SMD) ball pads. The substrate structure includes a substrate and a solder mask. The substrate has a first surface, a trace layer and at least one ball pad. The ball pad and the trace layer are disposed on the first surface. The trace layer has a plurality of traces, and at least one trace electrically connects to the ball pad. The solder mask has at least one opening corresponding to the ball pad. The size of the opening is larger than that of the ball pad. The solder mask covers the trace connecting to the ball pad. The problem of non-alignment of the solder ball can thus be solved, and the hole in the solder ball can be prevented when the substrate structure is welded with a PCB so that the reliability of solder ball welding can be improved.
Advanced Semiconductor Engineering, Inc.
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Pai-Chou Yu-Hsin
Liu Lee