49-Ball Wafer Level Chip Scale Package [WLCSP] (CB-49-1) Dimensions shown in millimeters a 3.500 3.450 SQ 3.400 0.650 0.595 0.540 SEATING PLANE 7 6 5 4 3 2 1 A BALL 1 IDENTIFIER B 3.000 REF SQ C D 0.340 0.320 0.300 E F G 0.50 REF BOTTOM VIEW (BALL SIDE UP) 111607-A TOP VIEW (BALL SIDE DOWN) 0.270 0.240 0.210