20-Ball Wafer Level Chip Scale Package [WLCSP] (CB-20-12) Dimensions shown in millimeters 2.430 2.390 SQ 2.350 9 8 BOTTOM VIEW (BALL SIDE UP) 7 6 5 4 3 2 1 A BALL A1 IDENTIFIER B C D 0.50 BSC TOP VIEW (BALL SIDE DOWN) PKG-004466 SEATING PLANE SIDE VIEW 0.300 0.260 0.220 0.50 BSC 0.330 0.300 0.270 COPLANARITY 0.05 0.230 0.200 0.170 01-17-2014-A 0.560 0.500 0.440 E