Conventional Printed circuit boards

Single-sided pcb’s are the simplest and the cheapest type of boards, with a single layer of copper on a rigid base material, solder resist and idents can also be added. This type of PCB can be used for both through hole and surface mount components (figure 1).

Figure 1Single Sided Printed Circuit Board

Double sided pcb’s consist of two copper layer on a rigid base material, the two copper layers are not connected (figure 2). Double sided pcb’s with plated through holes have two copper layers that can be connected by a copper plated hole (figure 3), solder resist and idents can also be added. This type of pcb can be used for both through hole and surface mount components.

Figure 2Double Sided Printed Circuit Board

Figure 3Double Sided Printed Circuit Board with PTH holes

Materials

Rigid pcb’s can be made from a wide range of base materials, the standard being FR4 which is a woven fibreglass cloth impregnated with an epoxy resin. The excellent electrical, mechanical and thermal properties of FR4 have made it an excellent material for a wide range of applications. The use of more exotic material such as polyimides, PTFE & Ceramics have been increasing steadily over the last 5 years and are now a large part of PW Circuits manufacturing output.