The most common MLCCs (multi-layer ceramic capacitors) in the industrial and automotive markets come with a TCC (temperature co-efficient of capacitance) known widely as X7R, where the ‘X’ stands for -55°C, the ‘7’ for +125°C, and the ‘R’ for ±15% tolerance over this temperature range. TCC Temperature range Tolerance X7R -55~125°C ±15% X7S -55~125°C ±22% With its narrower capacitance-change tolerance band of ±15%, many design engineers will simply select the X7R product over X7S.
