Clover-leaf solder mask opening

摘要

A solder mask having a clover-leaf shaped opening around a PTH for enhanced performance. The solder mask resides on a surface of a printed circuit board comprising lands and PTH's. The opening around the PTH is configured to maintain a minimum channel width between the PTH and an adjacent land while maximizing the opening around the PTH, thereby decreasing the likelihood that the solder mask material will be inadvertently drawn into the PTH.