Multilayer printed circuit

double-sided

Single-Layer vs. Double-sided PCBs vs. Multilayer PCBs: What's the Difference? Single-Layer PCB: Also known as single-sided boards, they have components on one side and a conductor pattern on the opposite side. They consist of a substrate layer, a conductive metal layer, and a protective solder mask and silk screen. Double-sided PCBs: These have one substrate layer with conductive metal layers on both sides. Circuits and components on one side are connected to those on the other side through through-holes or surface mounts. Multilayer PCBs: Made of three or more double-sided boards stacked on top of each other, typically with an even number of layers to prevent warping. Each substrate layer has conductive metal on both sides, and the boards are joined with adhesive and insulated material between each layer.