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SMT is similar to the previous "through-hole" circuit board technology in terms of components, functions and devices you can manufacture. With through-hole boards, each component had a number of leads or pins (anywhere from 2 to 64-plus) that had to be accurately aligned and pushed through holes in the circuit board, then soldered.

SMT uses minute pads on the surface of the board, and tabs on the SMT device are soldered directly onto the tabs.

SMT alignment must also be very accurate, so most SMT assembly is done using high-precision robotics.

SMT's two main advantages are easier manufacturing (no holes to place components in, no solder voids, etc) and the ability to make much smaller devices.

Gadgets such as mobile phones and iPods would probably not be as compact as they are without the benefits of SMT.

For *how it works*, you may need to do some heavy-duty reasearch: do you mean the electrical/electronic principles of SMT, the detailed physics of SMT devices, or how SMT gadgets are assembled?

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15y ago

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