Vishay has rolled out a new series of thick film surface-mount wraparound chip resistors with high power ratings of 0.33W in a compact 0805 case size. The RCWH series resistors are designed to save space and reduce component counts in telecommunications, computer, industrial, and consumer applications.
The RCWH resistors are optimised to be used as current sensing resistors and shunts in DC/DC converters, voltage regulation modules, and inverters in cell phones, computers, air conditioners, and heat pumps.
The new resistors are claimed to offer a power density over 2.5x higher than standard devices in this footprint. This allows them to be used instead of larger high power components, or multiple lower power devices, in new or existing designs. This, in turn, reduces board space requirements and placement costs as well as enables smaller and lighter end products, says the firm.
The resistors also provide higher reliability than larger thick film devices by reducing the co-efficient of thermal expansion (CTE) mismatch with the PCB, thereby lowering solder joint stress.
Specifications include low resistance values from 0.01 to 0.976-Ohm, tolerance down to ± 0.5 per cent, and TCR down to ±100 ppm/degree C. RoHS-compliant and halogen-free, the resistors feature a protective metal glaze on high quality ceramic.
Samples and production quantities of the RCWH devices are available now, with lead times of six to eight weeks for large orders.
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