CHIP RESISTORS Mounting DATA SHEET
●Due to their rectangular shape and small dimensional tolerances, Surface Mounted Resistors are suitable for handling by automatic placement systems. Chip placement can be on ceramic substrates and printed circuit boards (PCBs). Electrical connection to the circuit is by wave, vapour phase or infrared soldering. The end terminations guarantee a reliable contact and the protective coating enables ‘face down’ mounting.
●The laws of heat conduction, convection and radiation determine the temperature rise in a resistor owing to power dissipation. The maximum body temperature usually occurs in the middle of the resistor and is called the hot-spot temperature.
●The hot-spot temperature depends on the ambient temperature and the dissipated power. This is described in the data sheets under the chapter heading “Functional description”.
●The hot-spot temperature is important for mounting because the connections to the chip resistors will reach a temperature close to the hot-spot temperature. Heat conducted by the connections must not reach the melting point of the solder at the joints. Therefore a maximum solder joint temperature of 110 °C is advised. The ambient temperature on large or very dense printed-circuit boards (PCBs) is influenced by the dissipated power.
●The ambient temperature will again influence the hot-spot temperature. Therefore, the packing density that is allowed on the PCB is influenced by the dissipated power.
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ATV321 、 YC 102 、 YC104 、 YC 122 、 TC 122 、 YC 124 、 TC 124 、 YC 162 、 YC 164 、 YC324 、 YC248 、 YC158 、 YC358 、 TC164 |
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Datasheet |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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February 13, 2018 |
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