The '''
EIA Class 1 dielectric''' materials are
Ceramic Dielectric materials used in ceramic
capacitors of small values (typ. <5 nF). The EIA Class 1 dielectrics in general are usually based on
Titanate formulas (usually
Titanium_dioxide with
Calcium_titanate) with low or zero content of
Barium_titanate; due to its low content, their susceptibility to
Microphonics is low. (''Cf.''
EIA_Class_2_dielectric.) Their dependence on temperature is linear.
'''C0G''' (EIA) or '''NP0''' (industry spec) is the material with the lowest capacitance/temperature dependence (Negative-Positive zero). C0G/NP0 dielectrics have the lowest losses, and are used in filters, as timing elements, and for balancing crystal oscillators. Ceramic capacitors tend to have low
Inductance because of their small size. NP0 refers to the shape of the capacitor's temperature coefficient graph (how much the capacitance changes with temperature). NP0 means that the graph is flat and the device is not affected by temperature changes. The C0G/NP0 material can be used up to gigahertz frequencies.
Common materials are '''C0G'''/'''NP0''', '''P350''', '''N1000'''/'''M3K'''.
The ceramic composition may involve one or more of dielectric
Electroceramics
materials.
There are two naming conventions. The EIA version relies on letter-digit-letter code for the slope of the temperature-capacitance dependence. The industry version uses a N/P prefix (N for negative, P for positive) and the slope coefficient. See the comparison for some common materials:
EIA | M7G | C0G | B2G | U1G | P2G | R2G | S2H | T2H | U2J | P3K | R3L |
Industry | P100 | NP0 | N030 | N075 | N150 | N220 | N330 | N470 | N750 | N1500 | N2200 |
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/°C | Multiplier | Tolerance in ppm/°C (25-85 °C) |
C: 0.0 | 0: -1 | G: ±30 |
B: 0.3 | 1: -10 | H: ±60 |
L: 0.8 | 2: -100 | J: ±120 |
A: 0.9 | 3: -1000 | K: ±250 |
M: 1.0 | 4: +1 | L: ±500 |
P: 1.5 | 6: +10 | M: ±1000 |
R: 2.2 | 7: +100 | N: ±2500 |
S: 3.3 | 8: +1000 | |
T: 4.7 | | |
V: 5.6 | | |
U: 7.5 | | |
http://my.execpc.com/~endlr/ceramic.html
Category:Ceramic_materials
Category:Capacitors
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