The MM and SMM MELF resistors with cylindrical design and helical trimming cut offer an excellent resistive drift as low as 0.25% after 1000h of operation at full rated power. This is also known as “Endurance at 70°C” test, described in the product datasheet. The chart and table here illustrate the MELF resistors specified resistive drift over time compared to a standard thick film chip resistor.