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Contact SupplierDouble sided pcb, Double-Sided PCB are a step above single sided in their complexity. Double Sided PCBs require plated through holes to provide better anchoring for soldered components and front to back electrical continuity.
Most designs require solder mask front and back along with a silkscreen layer for component designators. Very often double sided designs utilize mixed technologies of through hole (PTH) and surface mount (SMT).