A semiconductor circuit design method, system and computer program product for placing a unit pin on a boundary of a unit of a semiconductor circuit to be designed may be provided. Pin position data is received, wherein the pin position data comprises a chip pin position of a chip pin within the chip area and outside of the unit of a semiconductor circuit, to which the unit pin is to be electrically connected. The coordinates of a center point of the unit are determined, as well as a line crossing the center point and the chip pin position. The unit pin is placed on an intersection of the boundary of the unit and the line crossing the center point.