High Voltage Type Resistors

One of the role of resistors in a circuit is detecting high voltage by voltage dividing. Rated voltage and maximum working voltage are specified for each resistor, which should not be exceeded when it is used. Plural resistors have to be used in serial to the high voltage side of voltage dividing resistor, which requires more numbers of mounting components and wider mounting area. In this case, HV73or RCR of high max. working resistors can be used to reduce the numbers of mounting components. Especially for HV73, with excellent voltage constant compared to general-purpose chip resistors, can divide the comparative high voltage at high precision.

Generally, resistor does not show a certain resistance against voltage. When voltage is high, the resistance will slightly decrease. Voltage coefficient is the indicator showing the decreasing rate of resistance at high voltage against the resistance at low voltage. Measure the resistance at 10% and at 100% of rated voltage or max voltage per element(max. working voltage), whichever is lower, and express on percentage(%/V) or parts per million(ppm/V).