What You Need to Know About Surface Mount PCB Jobs

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Need to Know About Surface Mount PCB Jobs

Surface mount pcb jobs involve the placement of surface-mount components on a printed circuit board using an automated pick and place machine. Unlike through-hole components that require insertion of wires in holes on the PCB, the leads from these components are soldered directly onto the pads on the board. This process allows a much greater level of functionality to be packed into a smaller space. It is also a much more stable and reliable method of assembly than traditional leaded components.

In order to work with surface-mount parts, the assembly worker needs to know a number of important things. First, the parts are very small and can be difficult to read or identify without magnification. They are also very sensitive to overvoltage and electrostatic discharges. This means that they must be stored and assembled in a properly protected environment. The assembly worker should also be able to read and interpret bills of materials, work orders and assembly drawings.

The most basic component used in a surface mount pcb job is a resistor. These are usually contained in a tiny plastic package, with the connection points being made through the leads that emerge from the package and connect to the corresponding copper foil tracks on the surface of the PCB. These are soldered with a paste that consists of fine solder particles, flux and other binding agents. This is then applied to the PCB with a specialized stencil and placed in the correct position on the circuit board.

What You Need to Know About Surface Mount PCB Jobs

Other elements that can be used include transistors and diodes. These are also mounted on the PCB, but they are attached differently than other components. With surface-mount transistors and diodes, the device’s leads are placed on pre-made contact pads on the PCB that are soldered to using a soldering gun.

Another common type of component is the IC, which can be found in a variety of packages. One popular package is known as a BGA, or Ball Grid Array. This has a number of connections on the underside of the package instead of on the top, and is found on many high-performance microcircuits.

A BGA can be mounted on a PCB using the same methods as a standard plug-in type IC, but with the exception of the pin length being half that of a standard plug-in package. There are other types of IC packages that can be used with the surface-mount mounting technology, including those that have a pin pitch that is too large to be effectively fabricated with through-hole metallization.

Other responsibilities of the assembly worker may include preparing and packing the product. They may also be responsible for a variety of re-work and touch up operations that might be needed on the finished product. This job is also responsible for preparing assembly tracking records and configuration logs as well as other documentation related to the PCB’s and assemblies. In some positions, the assembly worker may be required to operate machinery and perform basic test procedures as well.

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