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- Multilayer Ceramic Chip Capacitors
There are two different sets of code schemes used in the EIA standards. One set of codes is used to define temperature characteristics of class 1 capacitors (table 1), and the other is used to define temperature characteristics of class 2 capacitors (table 2).
Class 1 ceramics have many EIA codes, however C0G is the most commonly used. C0G is the EIA equivalent to the MIL NP0 (Negative, Positive, 0) specification. NP0 and C0G are specified to have capacitance tolerances of ±30ppm/ °C over the temperature range of -55°C to +125°C. However, TDK uses both NP0 and C0G to differentiate operating temperature ranges for class 1 capacitors. TDK extends the operating temperature range of NP0 to +150°C.
|TDK Class 1 Ratings|
Unlike class 1, class 2 has many commonly used codes.
Figure1: Class2 Temperature Characteristics Comparison
In the class 2 set of codes, the first letter determines the lowest operating temperature, the number determines the upper operating temperature, and the final letter determines the maximum change in capacitance at any temperature within that temperature range. Common class 2 EIA codes include X8R, X7R, X5R, Y5V, and Z5U
|EIA Class 2 TC Codes|
|Lower Temp||Upper Temp||Tolerance|
|X = -55°C||5 =+ 85°C||F = ±7.5%|
|Y = -30°C||6 = +105°C||R = ±15%|
|Z = +10°C||7 =+ 125°C||S = ±22%|
|8 = +150°C||T = +22% / -33%|
|U = +22% / -56%|
|V = +22% / -82%|
The two main JIS codes for MLCC temperature characteristics are CH, and JB. CH is the class 1 JIS code, rated for temperatures of -25°C to 85°C with a tolerance of ±60ppm/ °C. JB is the class 2 code, corresponding to a ±10% tolerance over the same temperature range of -25°C to 85°C.