The Basic Composition of PCB
(Printed Circuit Board)
A complete Printed Circuit Board (PCB) is consist of different parts, and each has its own function and purpose. If you are interest in this product and industry. Let’s read the following introduction and learn more!
- Pattern: The Pattern refers to the traces on PCB, which are used for circuit conduction between components, and a large copper surface is also designed as a ground and power plane.
- Dielectric: The dielectric is used to maintain the insulation between the circuit and each layer, also known as base material.
- Through hole: Also known as Via, which is used to connect the circuit between different layers. The larger sized via is used for insert component, also, there is non-plating through hole (NPTH), which is used for positioning while SMT process and fixing screws while assembling.
- Solder resistant/Solder Mask: Not all the copper surfaces need to be mounted components, thus, the non-mounted copper surface area will be applied a layer of solder mask (epoxy liquid material) to avoid short circuit occur.
- Legend/Marking/Silk screen: This is a non-essential part, the main purpose is only for marking the name, position frame for mounting components, so as to facilitate maintenance and identification after assembly.
- Surface Finish: Because the copper surface is easily oxidized when exposed to air, and it will lead to poor solderability. Thus, it will be applied a layer of surface finish to protect the copper surface. There several type of surface finish like: HASL, ENIG, Immersion silver, Immersion Tin, OSP…etc. Each of them has its own plus and minus. We will discuss this topic in a later article.
