20-Ball Wafer Level Chip Scale Package [WLCSP] (CB-20-8) Dimensions shown in millimeters 2.08 2.04 2.00 4 3 2 1 A BALL 1 IDENTIFIER B 2.75 2.71 2.67 2.00 REF C D 0.50 REF TOP VIEW (BALL SIDE DOWN) SEATING PLANE SIDE VIEW BOTTOM VIEW (BALL SIDE UP) 1.50 REF COPLANARITY 0.04 0.360 0.320 0.280 0.270 0.240 0.210 10-04-2011-B 0.660 0.600 0.540 0.390 0.360 0.330 E