- EIA Class 2 dielectric
The EIA Class 2 dielectric materials are
ceramic dielectricmaterials used in ceramic capacitors. In comparison with the EIA Class 1 dielectrics they tend to have severe temperature drift, high dependence of capacitance on applied voltage, high voltage coefficient of dissipation factor, high frequency coefficient of dissipation, and problems with aging due to gradual change of crystal structure. Aging causes gradual exponential loss of capacitanceand decrease of dissipation factor.
The EIA Class 2 dielectrics in general are usually based on formulas with high content of
barium titanate(BT), possibly mixed with other dielectric electroceramics. Due to its piezoelectricproperties, they are subject to microphonics. Other oxides added can be the same as used for Class 1 ceramics.
EIA X7R is designed for capacitors with capacity ranging typically between 3300 pF to 0.33 µF (SMT: 100 pF to 10 µF), 10% tolerance. Good for non-critical coupling, filtering, transient voltage suppression, and timing applications. Has high
dielectric constant. It is an EIA Class 2 dielectric. Its tolerance over a temperature range of -55 to +125 °C is ±15%.
Other commonly used materials are Y5P (2B4 in IEC specs), Y5U, and Z5U (2E5).
Y5P and Y5V are other such class 2 ceramics, with temperature range of -30 to +85 °C and wide capacitance change with temperature of ±10% or +22/-82%. Usually used for capacitances between 150 pF and 2 nF (SMT: 10 nF and 10 µF).
Z5U (EIA) or 2E6 (IEC code) — typical for 2.2 nF to 2.2 µF, 20%. Good for bypass, coupling applications. Low price and small size, poor temperature stability.
The EIA three-character code is derived from the low and high temperature limit, and the range of capacitance change.
EIA Class 1 dielectric
* [http://my.execpc.com/~endlr/ceramic.html Ceramic Capacitors]
* [http://www.kyoritsu-kcm.co.jp/english/electronic/electronic_04.html Various oxides for the use of electronic parts]
Wikimedia Foundation. 2010.
Look at other dictionaries:
EIA Class 1 dielectric — 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… … Wikipedia
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 … Wikipedia
EIA Standards — Here is a list of Electronic Industries Alliance (EIA) Standards: * EIA 232 RS 232 electrical characteristics single ended voltage digital interface circuit * EIA/ECA 310 Cabinets, racks (including 19 inch racks), panels and associated equipment… … Wikipedia
Electroceramics — While ceramics have traditionally been admired for their mechanical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy… … Wikipedia
C0G — ou NP0 (EIA Class 1 dielectric est une classe de diélectriques utilisés pour la fabrication de condensateurs céramiques. Voir aussi COG Catégories : Composant passifSigle de 3 caractères … Wikipédia en Français
NP0 — C0G C0G ou NP0 (EIA Class 1 dielectric est une classe de diélectriques utilisés pour la fabrication de condensateurs céramiques. Voir aussi COG Ce document provient de « C0G ». Catégories : Composant passif | Sigle de 3 caractères … Wikipédia en Français
X5R — is the name of a dielectric material used in ceramic capacitors. X5R performs better than other dielectrics, such as Y5V, and permits the construction of physically smaller capacitors than other dielectrics, such as NP0 and X7R.Typically its… … Wikipedia
Microphonics — (also called microphony) describes the phenomenon where certain components in electronic devices transform mechanical vibrations into an undesired electrical signal (noise). The term is derived by analogy to microphones where that behavior is… … Wikipedia
Ceramic capacitor — In electronics, a ceramic capacitor is a capacitor constructed of alternating layers of metal and ceramic, with the ceramic material acting as the dielectric. The temperature coefficient depends on whether the dielectric is Class 1 or Class 2. A… … Wikipedia
Optical fiber cable — A TOSLINK optical fiber cable with a clear jacket. These plastic fiber cables are used mainly for digital audio connections between devices. An optical fiber cable is a cable containing one or more optical fibers. The optical fiber elements are… … Wikipedia