Bourns® offers very high accuracy by being able to provide TCRs as low as 15 PPM in the PWR220-2S series (manganin foil resistors between 20°C and 60°C) and 75 PPM in the CRA2512, CRA2010, CRF2512, CRF1206 stamped metal alloy current sense resistors. The TCR of a current sense resistor depends on its resistance value and the resistive technology. For applications requiring a high operating temperature, the PWR4412 is derated to zero watts at 325˚C ambient temperature while CRA2512 is derated to zero watts at 170°C. Having such high operating temperatures allows designers to run the component at less than 100 %  power over a much wider operating temperature.