08055C datasheet(12/20 Pages) AVX

12 / 20 page

General Description

Formulations – Multilayer ceramic capacitors are available

in both Class 1 and Class 2 formulations. Temperature

compensating formulation are Class 1 and temperature

stable and general application formulations are classified

as Class 2.

Class 1 – Class 1 capacitors or temperature compensating

capacitors are usually made from mixtures of titanates

where barium titanate is normally not a major part of the

mix. They have predictable temperature coefficients and

in general, do not have an aging characteristic. Thus they

are the most stable capacitor available. The most popular

Class 1 multilayer ceramic capacitors are C0G (NP0)

temperature compensating capacitors (negative-positive

0 ppm/°C).

Class 2 – EIA Class 2 capacitors typically are based on the

chemistry of barium titanate and provide a wide range of

capacitance values and temperature stability. The most

commonly used Class 2 dielectrics are X7R and Y5V. The

X7R provides intermediate capacitance values which vary

only ±15% over the temperature range of -55°C to 125°C. It

finds applications where stability over a wide temperature

range is required.

The Y5V provides the highest capacitance values and is

used in applications where limited temperature changes are

expected. The capacitance value for Y5V can vary from

22% to -82% over the -30°C to 85°C temperature range.

The Z5U dielectric is between X7R and Y5V in both stability

and capacitance range.

All Class 2 capacitors vary in capacitance value under the

influence of temperature, operating voltage (both AC and

DC), and frequency. For additional information on perfor-

mance changes with operating conditions, consult AVX’s

software, SpiCap.

Basic Construction – A multilayer ceramic (MLC) capaci-

tor is a monolithic block of ceramic containing two sets of

offset, interleaved planar electrodes that extend to two

opposite surfaces of the ceramic dielectric. This simple

structure requires a considerable amount of sophistication,

both in material and manufacture, to produce it in the quality

and quantities needed in today’s electronic equipment.

Ceramic Layer

Electrode

Terminated

Edge

Terminated

Edge

End Terminations

Margin

Electrodes

Multilayer Ceramic Capacitor

Figure 1

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