Adaption circuit board for QFN44 & QFP44 (0.50 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 External switching options on the bottom side with 0603 SMD-Pads one pin each Resistors or similar components can be mounted directly