Ceramic Capacitor Temperature Stability

The multilayer ceramic capacitors mlccs are key components used in every electronic equipment to serve many functions such as filtering dc blocking coupling decoupling and so on 1 2 in recent years with the rapid development of electric vehicles high speed aircrafts and spacecrafts there is an urgent need for ultra high temperature multilayer ceramic capacitors uht mlccs to.

Ceramic capacitor temperature stability.

Class 1 ceramic capacitors offer high stability and low losses for resonant circuit applications. Class 1 ceramic capacitors are used where high stability and low losses are required. The storage temperature for these capacitors should be as low as possible and certainly below 25 c. For instance ceramic capacitors made using x5r dielectric materials have an operating temperature range of 55 c to 85 c with an allowable variation in capacitance of 15 over that range and exhibit non linear capacitance value stability over that range.

Class 1 and class 2. There are two classes of ceramic capacitors available today. Smaller ceramic capacitors can have a nominal value as low as one pico farad 1pf while larger electrolytic s can have a nominal capacitance value of up to one farad 1f. Class 1 ceramic capacitors with high stability and low losses compensating the influence of temperature in resonant circuit application.

In capacitors with polar electrolytes used in high voltage capacitors made by epcos the chemical interaction between electrolyte and oxide dominates the blocking behavior of the dielectric. Common eia iec code abbreviations are c0g np0 p2g n150 r2g n220 u2j n750 etc. The two most common types are multi layer ceramic capacitors and ceramic disc capacitors. Class 3 ceramic capacitors offer higher volumetric efficiency than the class 2 ceramic capacitors but their temperature stability is not nearly so good.

Characteristics precision and tolerances. Class 2 ceramic capacitors offer high volumetric efficiency for buffer by pass and coupling applications. 230 c hermetically sealed smd tantalum capacitors several studies have been launched to assess the stability parameters of tantalum surface mounted capacitors at temperatures above. The capacitance of a capacitor can change value with the circuit frequency hz y with the ambient temperature.

A typical performance for the change of capacitance with temperature is 22 to 56 over a range of 10 c to 55 c.