Today's devices are moving in a small direction, a trend that requires smaller and smaller precision resistors to support higher and higher power densities. This usually means that the surface mount chip resistor should be used whenever possible. Is this the saying? SMT technology is not perfect. Today's devices are moving in a small direction, a trend that requires smaller and smaller precision resistors to support higher and higher power densities. This usually means that the surface mount chip resistor should be used whenever possible. Is this the saying? SMT technology is not perfect.
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Smaller sometimes means hotter
Due to the power density, the surface mount chip resistors operate at a higher temperature than the via devices. The heat of surface-mount (SMT) devices is mostly dissipated through the PCB, while the heat of the through-hole devices is mostly dissipated into the surrounding air. Therefore, the accumulation of heat in the system caused by the surface mount components will affect all other devices on the board. In view of this excessive heat, the long-term stability of the resistor will decrease when operating at higher temperatures.
Smaller may mean more fragile and harder to clean up
SMT components can also cause structural problems. When the aspect ratio (or aspect ratio) of the chip exceeds the limits specified by reliability (usually about 2:1), board bending stress can cause the chip to break or break away from the board. Increasing the chip width and placing it within a 2:1 aspect ratio is not a suitable solution, it does not help to eliminate stress. Simply increasing the chip width makes it more difficult to remove the solvent and rosin left behind the chip after assembly.
Designed to provide higher resistance, higher power, tighter tolerances, and better long-term stability while using less board space and easier to clean solvent and rosin resistance - such as configured as a molded rectangular frame or Precision resistors in metal sealed cans are often the best choice, especially in high precision applications. These resistors extend from the bottom surface through the via pins. Http://news.chinawj.com.cn 
Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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