EIA Class 1 dielectric
Encyclopedia
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:
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.
Electronic Industries Alliance
The Electronic Industries Alliance was a standards and trade organization composed as an alliance of trade associations for electronics manufacturers in the United States. They developed standards to ensure the equipment of different manufacturers was compatible and interchangeable...
Class 1 dielectric materials are ceramic
Ceramic
A ceramic is an inorganic, nonmetallic solid prepared by the action of heat and subsequent cooling. Ceramic materials may have a crystalline or partly crystalline structure, or may be amorphous...
dielectric
Dielectric
A dielectric is an electrical insulator that can be polarized by an applied electric field. When a dielectric is placed in an electric field, electric charges do not flow through the material, as in a conductor, but only slightly shift from their average equilibrium positions causing dielectric...
materials used in ceramic capacitors of small values (typically <5 nF). The EIA Class 1 dielectrics in general are usually based on titanate
Titanate
In chemistry, titanate usually refers to inorganic compounds composed of titanium oxides. In some cases, the term is used more generally for any titanium-containing anion, e.g. [TiCl6]2- and [Ti7]2-. This article focuses on the oxides....
formulas (usually titanium dioxide
Titanium dioxide
Titanium dioxide, also known as titanium oxide or titania, is the naturally occurring oxide of titanium, chemical formula . When used as a pigment, it is called titanium white, Pigment White 6, or CI 77891. Generally it comes in two different forms, rutile and anatase. It has a wide range of...
with calcium titanate
Calcium titanate
Perovskite is a calcium titanium oxide mineral species composed of calcium titanate, with the chemical formula CaTiO3.The mineral was discovered in the Ural Mountains of Russia by Gustav Rose in 1839 and is named after Russian mineralogist Lev Perovski .It lends its name to the class of compounds...
) with low or zero content of barium titanate
Barium titanate
Barium titanate is the inorganic compound with the chemical formula BaTiO3. Barium titanate is a white powder and transparent as larger crystals...
; due to that low content, their susceptibility to microphonics
Microphonics
Microphonics describes the phenomenon where certain components in electronic devices transform mechanical vibrations into an undesired electrical signal...
is low. (Cf. EIA Class 2 dielectric
EIA Class 2 dielectric
The EIA Class 2 dielectric materials are ceramic dielectric materials used in ceramic capacitors.The EIA Class 2 dielectrics in general are usually based on formulas with high content of barium titanate , possibly mixed with other dielectric electroceramics. Due to its piezoelectric properties,...
.) 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
Inductance
In electromagnetism and electronics, inductance is the ability of an inductor to store energy in a magnetic field. Inductors generate an opposing voltage proportional to the rate of change in current in a circuit...
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.
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See also
- EIA Class 2 dielectricEIA Class 2 dielectricThe EIA Class 2 dielectric materials are ceramic dielectric materials used in ceramic capacitors.The EIA Class 2 dielectrics in general are usually based on formulas with high content of barium titanate , possibly mixed with other dielectric electroceramics. Due to its piezoelectric properties,...
- EIA StandardsEIA StandardsHere is a list of Electronic Industries Alliance Standards:* RS-170 Name? * EIA-222 Standards for antenna mast structural integrity...
- Ceramic Capacitors