SMDs are smaller than through-hole resistors and instead of having wire leads that go through PCB, they have terminations that are soldered to pads on the surface of the board. SMT was developed to meet the ongoing demand for printed circuit board (PCB) manufacturers to use smaller components that are faster, more efficient, and cheaper. An SMD is any electronic component that is made to use with Surface Mount Technology (SMT).
Surface mount resistors are commonly used in telecommunication, automotive, and medical equipment, as well as in personal devices, displays, and advanced technology research instruments.Ī: SMD stands for Surface Mount Device. Surface mount resistors are used in large quantities and are the preferred resistor for use in electronics equipment, because of the small size and high reliability. Surface mount resistors can be thick film, which is most commonly used, thin film, which offers accuracy and stability, metal strip, for current sensing, or wirewound, which is molded construction as opposed to a flat chip. The whole board is then passed through a reflow oven which melts the solder into place, making the contacts.Ī surface mount resistor provides the same functionality as the more traditional axially leaded resistors but has a lower power dissipation capacity and oftentimes a lower stray inductance and capacity. Solder paste is printed onto the mounting pads of a PCB, and the resistors are placed automatically onto these pads by pick and place equipment. It features the resistance value code printed onto it, where there is space.
A surface mount resistor is a tiny rectangular ceramic body with silver conductive edges on either end. Also referred to as surface mount technology, an SMD resistor offers advantages in saving space on printed circuit boards (PCBs).
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