W4X5.20 — 4x5 Array 20 Ball Wafer Level Chip Scale Package (WLCSP) Plastic Packages for Integrated Circuits Package Outline Drawing W4x5.20 4x5 Array 20 Ball Wafer Level Chip Scale Package (WLCSP) Rev 1 8/09 2.545 ± 0.02 X 2.00 Y 20X 0.32 ± 0.03 4 0.25 ……