This part of IEC 60191 provides common outline drawings and dimensions for all types of structures and composed materials of fine-pitch ball grid array (hereinafter called FBGA), whose terminal pitch is less than, or equal to, 0,80 mm and whose package body outline is square. The demand for area array style packages exists according to the multi-functioning and high performance of electrical equipment. The object of this design guide is to standardize outlines and secure interchangeability of FBGA packages. The terminal pitch and package outlines of these fine-pitch array packages are smaller than those of BGA packages.