EIA codes for temperature limits and capacitance changes, ΔC.Įxample: X7R means with EIA designations the temperature range -55/+125 ☌ where the capacitance change maximum ☑5%, provided the DC voltage is zero. Therefore EIA characterizes the ceramic with three characters that in order state the lower and the upper limit of the temperature range and last the capacitance change within the range. The temperature dependence of the capacitance is large. The first group is in our tables and diagrams represented by the ceramic type denominated X7R or 2C1, the latter by Z5U or 2F4.Ĭlass 2 capacitors are characterized by high dielectric constants, often designated with a K followed by the εr. Ceramic Class 2 capacitors can be divided in two main groups, one with a moderate temperature dependence for the class – ΔC ≤ ☑5% within the temperature range – and the other with such changes that only a fraction of the capacitance remains at the temperature limits.
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