EIA Class 1 dielectric – 1550nm diode laser module – red diode laser module 650n
The EIA Class 1 dielectric materials are ceramic dielectric materials used in ceramic capacitors of small values (typically <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 that 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 flat plate construction. Most other types of capacitor are wound and thus inductive. This makes ceramic capacitors well suited to high-frequency work, where they are often used as a leadless disc or plate soldered inline with the PCB track.
NP0 refers to the shape of the capacitor’s temperature coefficient graph (how 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
See also
EIA Class 2 dielectric
EIA Standards
Ceramic Capacitors
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