The meander trimming cut of the resistive element helps the TNPU series to be specified to a resistive drift of less than 0.1% when considering 8000 hours of operation with full power applied to the resistor. This is also known as the endurance at 70⁰C test as described on the product datasheet. The table shown here illustrates the specified resistive drift over time of the TNPU series in comparison with thin film components offered by competitors of Vishay. The values shown are specified limits, not typical values. The typical resistive drift over time is usually much lower than the specified limits, however considering only typical resistive drift does not support worst case scenario analysis during the design process.