High-Temperature CHR and HVC Chip Resistors

Whether for magnetic resonance scanners, aircraft flight controls, or down-hole instrumentation for oil wells, Riedon™ products by Bourns advanced CHR and HVC chip resistors deliver high-performance, high-temperature operation with resistance values up to 10 TΩ.

By using superior materials and combining an inner terminal of silver/palladium with a wrap-around of platinum/silver, it can offer chip resistors that can work in applications up to +300°C. This special termination technology confers several other advantages for demanding applications. In particular, it is suitable for silver epoxy attachment. It provides the reliability and high-temperature performance essential for the temperature probes and pressure monitoring devices used in oil and gas exploration. Further, by avoiding nickel, these chip resistors are completely non-magnetic and can be used in the presence of strong magnetic fields, such as medical CT and MRI scanners. The absence of tin in the terminal finish avoids the tin-whisker problem that can be a concern in aerospace applications. Termination material also influences voltage coefficient of resistance (VCR), an important characteristic of high-voltage resistors. These chip resistors are specifically designed to achieve low VCR.