Ceramic disc capacitors have labels and markings that identify their characteristics. What do these values mean?
Operating temperature: The black top indicates its industrial temperature operating range (-25° C/-13° F to 85° C/185° F). The normal range is 10° C/50° F to 65° C/149° F.
Capacitance: To read the capacitance, the center value code must be deciphered; this is a set of four alphanumeric characters: three digits and one letter. The first and second characters, both digits, symbolize the actual value. The third character is a digit symbolizing a multiplier where 10 is raised to the power of that digit. The fourth character is a letter symbolizing the tolerance code. The capacitance is measured in picofarads (pF).
Voltage: An underline indicates 50 V to 100 V, and no underline indicates 500 V.
Capacitor tolerance codes:
C = ±0.25 pF
D = ±0.5 pF
E = ±1 pF
G = ±2%
J = ±5%
K = ±10%
L = ±15%
M = ±20%
N = ±30%
Z = +80% to 20%
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