Adaption circuit board for WLCSP4 with 0.40 mm pitch. Epoxy fibre-glass FR4 1.50 mm. Double-sided 35 µm Cu. Plated through holes (PTH). Surface chem. Ni/Au. Solder stop mask. Hole spacing 2.54 mm. Solder pads Ø 2.10 mm. Shield pad, Typ = Adapter z adaptac