a 291-Ball Chip Scale Package Ball Grid Array [CSP_BGA] (BC-291-1) Dimensions shown in millimeters 12.10 12.00 SQ 11.90 A1 CORNER INDEX AREA 22 20 18 16 14 12 10 8 6 4 2 21 19 17 15 13 11 9 7 5 3 1 A A1 BALL CORNER C E G 10.50 BSC SQ J L TOP VIEW N R 0.50 BSC U W B D F H K M P T V Y AA AB BOTTOM VIEW DETAIL A *1.20 MAX DETAIL A 0.65 MAX 0.15 MIN *COMPLIANT TO JEDEC STANDARDS MO-195 WITH THE EXCEPTION TO PACKAGE HEIGHT. 060707-B SEATING PLANE 0.35 COPLANARITY 0.30 0.08 0.25 BALL DIAMETER