The PCB-layout is critical to good performance. Therefore special care should be taken to ensure good electrical and good thermal properties. In the motor driver circuitry highly sensitive analog signals are close to high current motor and gate current tracks, so a good placement is essential. The TMC2100 has a tiny 5 mm x 6 mm package. Its exposed die attach pad ensures heat dissipation into the PCB. Therefore a number of thermally conductive vias is required to ensure a thermal contact to a GND layer, spreading heat into the whole PCB. Take care to ensure solderability – too large of a diameter of the vias will lead to solder being drawn away. Countercheck with the PCB manufacturer or assembly site for best selection.