01910201| Datasheet

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General Technical Information General technical information
1 1.1 Definition and construction Introduction

The term ceramic capacitors covers a large group of capacitors. Their properties may be quite different, but they all have the oxide ceramic dielectric in common. Ceramic generally means that an inorganic polycrystalline body is formed by sintering at high temperatures. By means of special production methods, extremely thin layers of ceramic materials can be obtained. These layers are stacked to construct capacitors whose electrical and mechanical properties meet stringent requirements. The multilayer capacitors consist of a monolithic ceramic block with comb-like sintered electrodes. These electrodes come to the surface at the face ends of the ceramic block where an electrical contact is made by burnt-in metallic layers. Schematic construction of a multilayer capacitor with nickel-barrier termination:
Ceramic body

Termination (nickel barrier)

Inner electrode

NME BME AgPd Ni/Cu

Substrate electrode Intermediate electrode External electrode

NME Ag Ni Sn

BME Cu Ni Sn

e0 er ( n 1 ) A C = -------------------------------------------d

NME: Noble Metal Electrode BME: Base Metal Electrode
KKE0362-U-E

C e0 er A n d

Capacitance of capacitor [As/V = F] 8,85 10 -12 As/Vm Absolute dielectric constant Relative dielectric constant (material dependent) Effective electrode area per electrode [m2] Number of electrodes (metal layers) Electrode spacing [m]

191 10/02