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Forum COG/C0G. What do the letters stand for.
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COG/C0G. What do the letters stand for.

hargreaves
hargreaves over 15 years ago
Does anyone know what the letters C0G (C Zero G) when referring to ceramic caps stand for? I know that NP0 stands for negative, positive, zero which means that the cap value does not change in either the negative and positive direction as the cap temperature changes unlike X7R etc. I know that c0g and np0 are the same class 1 caps. But what do these letters and zero mean with c0g?
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  • KennyMillar
    KennyMillar over 15 years ago +1
    Wikipedia has this table which explains the EIA designations... The EIA three-character code for the material capacitance-temperature slope is derived from the low and high temperature limit, and the range…
  • KennyMillar
    KennyMillar over 15 years ago

    Wikipedia has this table which explains the EIA designations...

     

    The EIA three-character code for the material capacitance-temperature slope is derived from the low and high temperature limit, and the range of capacitance change.


    ppm/°CMultiplierTolerance in ppm/°C (25-85 °C)
    C: 0.00: -1G: ±30
    B: 0.31: -10H: ±60
    L: 0.82: -100J: ±120
    A: 0.93: -1000K: ±250
    M: 1.04: +1L: ±500
    P: 1.56: +10M: ±1000
    R: 2.27: +100N: ±2500
    S: 3.38: +1000
    T: 4.7
    V: 5.6
    U: 7.5

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  • hargreaves
    hargreaves over 15 years ago in reply to KennyMillar

    Thanks Ken.

     

    That is interesting because I have seem another label system that explains the class 2 and 3 ceramics, but this is a different system.

    I don't know who devised this standard, whether it was EIA or whoever but it is interesting that the NP0 comes from this and the C0G comes from the EIA that you revealed. I suppose like many things in electronics (and life) there are more than one standard.

     

    First   symbol
    (a letter)
    Low   temperature
    requirement
    Second   symbol
    (a number)
    High   Temperature
    requirement
    Third   Symbol
    (a letter)
    MAX.   Capacitance
    change over
    temperature
    Z-10   °C245 °CA+1%
    Y-30   °C465 °CB+/-   1.5%
    X-55   °C585 °CC+/-   2.2%
    6105 °CD+/-   3.3%
    7120 °CE+/-   4.7%
    8150 °CF+/-   7.5%
    P+/-   10.0%
    R+/-   15.0%
    S+/-   22.0%
    T+22%,   -33%
    U+22%,   -56%
    V+22%,   -82%
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