316-Lead Plastic Ball Grid Array [PBGA] (B-316) Dimensions shown in millimeters a 23.20 23.00 SQ 22.80 A1 BALL PAD CORNER 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 A1 BALL PAD CORNER 19.85 19.50 SQ 19.30 A B C D E F G H J K L M N P R T U V W Y AA AB BOTTOM VIEW 21.00 BSC SQ TOP VIEW 1.00 BSC 3.50 MAX DETAIL A DETAIL A 2.50 MAX 3.00 0.25 0.30 MIN SEATING PLANE 0.70 0.60 0.50 BALL DIAMETER COMPLIANT TO JEDEC STANDARDS MS-034-AAJ-1 COPLANARITY 0.20 NOM