Surface-mount resistors are available in various packages, including 0805, 1206, and SOT23. The 0805 and 1206 packages are the most common, and they are typically used for small- to medium-sized designs. The SOT23 package is smaller and can be used for very small formats.

When choosing a surface-mount resistor package for your design, you must make several considerations. Continue reading to learn more.


Defining a Surface Mount Resistor

In electronic design, a surface-mount resistor is a type of resistor that is mounted on the surface of a printed circuit board (PCB). Surface-mount resistors are usually smaller in size than through-hole resistors, and they can be used in a wide variety of electronic devices.

If you are designing a PCB, decide whether to use surface-mount or through-hole resistors. There are several factors to consider when making this decision, including the size and complexity of your design, the number of resistors you need, and the availability of surface-mount resistor packages.


Deciding on a Surface Mount Resistor Package

When picking the right surface mount resistor package for your needs, there are a few things you need to take into account. The most important factors to consider are:

  • Size is important because you need to make sure that the package you choose is small enough to fit in the space you have available. If you’re working with a very tight space, you might need to select a smaller package size.
  • Resistance is another key factor to consider, as it’s key to ensure that the resistor you choose can handle the amount of current you need it to. If you’re working with high voltages, you’ll need a resistor with higher resistance.
  • The tolerance of the resistor is also an important consideration. The tolerance determines how accurate the resistor is. A high tolerance means that the resistor is more accurate.
  • Current and Power Dissipation. Consider the current and power dissipation of the resistor. This will determine how much power the resistor can handle. Working with high currents entails needing a resistor with higher power dissipation.


Understanding the Impact of a Surface Mount Resistor Package

With surface mount resistors, the package you choose can have a big impact on the overall performance of your circuit. Key aspects that surface mount resistors affect are the following:

  • When it comes to clearance, the package of a surface mount resistor can play a major role. In general, the smaller the package, the less clearance the component will require.
  • It is important to consider the type of environment that the resistor package will be exposed to. If it is in a high-temperature environment, for example, it is important to choose a package that can withstand those conditions.
  • Trace Routing. In terms of trace routing, it is important to consider the width of the traces and the spacing between them. This is especially important in high-speed designs where trace width and spacing can affect signal integrity.
  • Stackup Design. Finally, in terms of stackup design, it is important to consider the thickness of the dielectric material and the spacing between the layers. This is especially important in multilayer designs.



In conclusion, it is important to consider the package of your surface mount resistor when designing your circuit. Select the right package for your design in order to ensure optimal performance.

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