April 20, 2024


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What Is SMD Resistor And Its Function?

smd resistor

SMD Resistors have similar functionality as a normal resistor on steroids. Only, with an SMD, you can place it directly on the circuit board and then solder it in place. Thereby, removing the need for leads and eliminating snags in automated manufacturing caused by leads.

SMD, or surface mount resistor, is a tiny rectangular ceramic body with conductive silver edges on each of its ends. It is a product of an advanced manufacturing technology called surface mount technology, or SMT for short. SMT serves a variety of advantages to manufacturers, such as better automation, higher reliability, greater functionality, reduced size, and lowered cost of manufacturing.

Ahead are some of the functions of an SMD Resistor and how they are used to get the maximum benefit from SMT.


1.    They Save Space On Circuit Boards

SMD Resistors save space on circuit boards by removing the need for wires (or leads) that go through a circuit board. Instead, they have terminations that are soldered directly onto the surface of the circuit board. Additionally, no holes are made to install an SMD Resistor (unlike traditional resistors), hence both sides of the board can be better utilized.

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This, better utilization of the circuit board, along with the much smaller size of SMD Resistors (as compared to traditional axial or leaded components), enables greater levels of miniaturization to be achieved.


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TME Electronics offers more than 11 types of SMD resistors for you, the warehouse stock of one of which exceeds 4,633,000 pieces. You can order SMD resistors with different power ratings ranging from 0.05 W – 0.50 W and sizes varying from 0.6 x 0.3 mm – 6.30 x 3.10 mm. Check their SMD resistors collection here: https://www.tme.com/us/en-us/katalog/smd-resistors_100300/

2.   Reduction in Power Dissipation

The smaller size of SMD Resistors, and the use of SMT technology, make them much better at preventing power dissipation and lowering stray inductance and capacitance. They can provide you with the same functionality as traditional axially leaded resistors but with better efficiency.

3.    Better Accuracy and Higher Tolerances

Because of SMT and better accuracy of the technology, SMD Resistors can be manufactured to higher tolerances. They also possess a good temperature coefficient of resistance, which enables the long-term resistance stability of SMD Resistors.

4.    Preferred Types of Resistors in Electronic Equipment

SMD Resistors are the preferred types of resistors used in electronic equipment primarily because of their small size and high reliability. They are widely utilised in automobiles, telecommunications equipment, medical devices, displays, personal electronics, and cutting-edge research tools.

Limitations Of SMD Resistors

Knowing the limitations of SMD Resistors is also important so you can use them in their optimal environment and get the most out of the technology.

One drawback of SMD Resistors is that they can not achieve as high a rating as traditional axial leaded components.Although the typical current levels of the majority of circuits are often lower than the limits of SMD, care should still be taken to avoid using more power in order to avoid damage.

In addition, SMT doesn’t offer much ability to rework the components, which is doable when it comes to traditional leaded components. Hence, SMDs need to be designed with a definite goal in mind.

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