Profile: Shenzhen Semshine Tech Co.,Ltd is a supplier of printed circuit boards (PCBs). We specialize in PCB design, PCB production, and PCB assembly services. We are an ISO 9001:2000 certified company. Double sided printed circuit boards, also known as double sided plated through or DSPT, are the gateway to higher technology applications. double sided printed circuit boards alternate between the top and bottom layers by using vias in which the components are linked either through-hole technology or surface mount technology. Aluminum circuit board contains a thin layer of thermally conductive dielectric material, which has the effect of transferring heat.