Ứng dụng PCB tại Việt Nam

01/03/2021 ĐỘI VIS

A printed circuit board (PCB) mechanically supports and electrically connects electrical or electronic components using conductive tracks, pads and other features etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate. Components are generally soldered onto the PCB to both electrically connect and mechanically fasten them to it.

Types of Assembly Processes

There are two main methods used for PCB applications — thru-hole and surface mount.

1. Thru-Hole Mounting

In the thru-hole mounting process, the assembler places component leads into holes drilled into a bare PCB. This technology was the original one used for PCBs.

Thru-hole technology creates a stronger connection than surface mount technology does, so it’s used for applications that require high reliability. This is because the leads run all the way through the board, as opposed to being attached with solder as in surface mounting. Thru-hole technology is also useful for testing and prototyping applications that require manual adjustments of components.

2. Surface Mounting

In the surface mounting process, components are mounted directly to the PCB surface using solder. This method was developed in the 1960s and became popular starting in the 1980s. Today, it is the most commonly used component mounting method. Surface mount boards use small components called vias, rather than thru-hole components, to connect the various layers of the PCB.

Using surface mounting allows the assembler to attach components to both sides of the board. Surface mounted components can also be smaller, enabling more parts to fit on a single board. This reduces costs and has allowed electronic devices to get smaller and smaller over the years. Surface mounting can also be completed faster and is a less involved process than thru-hole mounting is, further reducing costs.

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