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Image of Vishay CRCW-HP pulse-proof high-power thick-film chip resistors - performance

The CRCW-HP series resistors can also be used to improve reliability of a circuit board against thermal cycling. After a high number of temperature cycles, mismatches of the coefficients of thermal expansion (CTE) between components and the PCB can cause solder joint fatigue. Minimizing the distance between terminals for each component helps to mitigate temperature cycling issues. This can be accomplished by using smaller CRCW-HP series components to achieve the necessary power dissipation rating. For example, a standard 1206 size resistor with power rating 0.25W can be replaced with a CRCW-HP 0603 sized part which will have better thermal cycling performance. The special design of the CRCW-HP series strengthens the terminals against thermal cycling, even outperforming standard parts of the same size. To illustrate, the CRCW0805-HP meets 2000 cycles of thermal cycling requirements while the standard 0805 size thick-film chip resistor is only specified up to 1000 cycles.

PTM Published on: 2011-02-09
PTM Updated on: 2022-05-16