256-Ball Chip Scale Package Ball Grid Array [CSP_BGA] (BC-256-1) Dimensions shown in millimeters 12.10 12.00 SQ 11.90 16 15 14 13 12 11 10 9 8 A1 CORNER INDEX AREA 7 6 5 4 3 9.75 BSC SQ *1.70 1.51 1.36 1 A B C D E F G H J K L M N P R T BALL A1 INDICATOR TOP VIEW 2 0.65 BSC BOTTOM VIEW DETAIL A DETAIL A *1.31 1.21 1.10 *0.30 NOM 0.25 MIN SEATING PLANE 0.45 COPLANARITY 0.40 0.10 MAX 0.35 BALL DIAMETER *COMPLIANT TO JEDEC STANDARDS MO-225 WITH EXCEPTION TO DIMENSIONS INDICATED BY AN ASTERISK. 012006-0 a