Definition

Temperature Coefficient of Resistance (TCR) describes how much a resistor's value changes with temperature, expressed in parts per million per degree Celsius (ppm/°C). Positive TCR means resistance increases with temperature. For embedded resistors, TCR matters for precision applications where temperature variations affect circuit performance. Thin-film embedded resistors (NiCr) typically achieve TCR of ±100 ppm/°C or better, while thick-film carbon may have TCR of ±250-500 ppm/°C. Lower TCR indicates better temperature stability.