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surface mount devices

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Alex Topham

on 19 March 2013

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Transcript of surface mount devices

Alex Topham surface mount devices What is a surface mount device disadvantages of surface mount devices A surface mount device is a small electrical component that is placed on a printed circuit board. This technology has largely replaced the traditional through hole technology that used to be used. But both types of components can still be found on the same board. advantages of surface mount devices There are many advantages in using surface mount devices over the more traditional through hole devices:

firstly the surface mount devices are much smaller than the traditional components.

also the components can be manufactured and placed on the boards much faster than the hole through components. Some of the disadvantages of using surface mount devices is that.

1. components must be placed using a pick and place machine, which are very expensive

2. some of the higher voltage components are not suitable to be used

3. repairs are more complected as specialize tools are required to remove the components. Types of Components There are many different types of components used in surface mount technology.
Here are some examples or surface mount components and standard through hole components. As can be seen the surface components are much smaller than the through hole components The Manufacturing Process There are many different parts in the manufacturing of the surface mount P.C.B boards. I will now explain the processes.

firstly the PCB is designed on a circuit package and is simulated to ensure that it will work. Manufacturing process The blank board firstly has the tracks etched into it, and it also has the holes for the components drilled into it.

The bored is then covered in a solder paste, this paste is placed where ever components will be placed on the board. It contains the flux used to attach the components to the board this is so that the components don't need to be placed by hand. Manufacturing process The components are then placed onto the board by using an automated pick and place machine. The machine can work much faster than the any hand laborer. Also a worker couldn't place the components by hand as they are so small so a pick and place machine must be used. The components are then passed through a reflow solder so that all of the components are in contact with the board.
Manufacturing process the boards are then inspected by a computer to ensure that all of the components have been correctly placed and are working. A device called an optical inspector is used to find any week points or bad joints

Finally the PCB is tested to ensure that it works effectively, if it dose then it is ready for sale.
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