56-Ball Wafer Level Chip Scale Package [WLCSP] (CB-56-1) Dimensions shown in millimeters a 0.645 0.600 0.555 3.330 3.290 3.250 BALL A1 IDENTIFIER SEATING PLANE 0.40 BALL PITCH 8 7 6 5 4 3 2 1 A B 2.980 2.940 2.900 C 2.40 REF D 0.287 0.267 0.247 E F G 0.04 NOM COPLANARITY 0.230 0.200 0.170 BOTTOM VIEW 2.80 REF (BALL SIDE UP) 021109-A TOP VIEW (BALL SIDE DOWN) 0.415 0.400 0.385