Currently, SMD is widely used as it is more economical and mounted/soldered automatically, so it should be integrated into through hole parts in the process of production. However, THR & SMT parts (PCB type) meet the traditional THR (Through Hole Reflow) technology. The product design conforms to IEC 61760-1 Surface mounting technology – Part 1: Standard method for the specification of surface mounting components (SMDs) / DIN EN 61760-1 Surface mounting technology - Part 1: Standard method for the specification of surface mounting components (SMDs).