A Double-Sided PCB is a board with circuit traces on both sides. The two faces are connected by plated holes. Single-sided PCBs are good for many applications, but when the circuit requires a certain level of complexity or needs to be compact, the Double-Sided PCB’s are necessary. Today, Double-Sided Plated Through Holes, also called DSPTH, are the principal type of PCB on the market. The ICAPE Group offers a wide range of materials for the boards and holes. With more than 20 years of experience, we can ensure the best products, the best quality, and the best prices.
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Multiple materials are available for board manufacturing. The most used is FR4, which is a costly material, but CEM3 is also possible. The traditional method of making the electrical connections between the top and bottom circuits is to drill holes plated with a conductive material (usually copper). The holes can also be punched and filled by specific materials (copper, silver ink, or carbon).
HAL is mostly used to plate the holes, but OSP, ENIG (Electroless Nickel Immersion Gold), tin and silver are also possible. In the last three decades, the density of connections has increased tremendously for this technology. Lines and spaces (L/S) decreased from 150µ, which is the most common use, and even down to 75µ or 50µ for some specific applications! For the hole size, it's now down to 0.2mm. This downsizing allows a greater density and a huge gain on the sizes of the PCBs. The solder mask is usually green, but a lot of different colours is available.
A Double-Sided PCB is low cost and environmentally friendly. Silkscreen printing utilised in the through-hole silver circuit is not harsh nor hazardous, which allows for the use of economical board materials. The reliability is very high because the holes are chemically cleaned and activated to ensure good plating and connection between the top and bottom layers.