a A1 BALL CORNER 324-Ball Chip Scale Package Ball Grid Array [CSP_BGA] (BC-324-1) Dimensions shown in millimeters 19.10 19.00 SQ 18.90 A1 BALL CORNER 18 16 14 12 10 8 6 4 2 17 15 13 11 9 7 5 3 1 A B C D E F 17.00 BSC SQ G H J K L M 1.00 BSC N P R T U V 1.00 REF TOP VIEW DETAIL A DETAIL A 1.31 1.21 1.11 0.50 NOM 0.45 MIN SEATING PLANE 0.70 COPLANARITY 0.60 0.20 0.50 BALL DIAMETER *COMPLIANT TO JEDEC STANDARDS MO-192-AAG-1 WITH THE EXCEPTION TO PACKAGE HEIGHT. 04.22.09-A *1.80 1.71 1.56 BOTTOM VIEW