The normal working range for most capacitors is -30 o C to +125 o C with nominal voltage ratings given for a Working Temperature of no more than +70 o C especially for the plastic capacitor types.
The temperature characteristics of ceramic capacitors are those in which the capacitance changes depending on the operating temperature, and the change is expressed as a temperature coefficient or a capacitance change rate. There are two main types of ceramic capacitors, and the temperature characteristics differ depending on the type. 1.
The temperature range for the capacitor is mentioned as 35V to 1000V for Metallized Polyester capacitors with up to 480V. The Capacitance Range chart also includes other specifications such as capacitance tolerance, temperature coefficient, capacitance stability, insulation resistance, dissipation factor, and dielectric absorption.
The capacitance tolerance is ±20% to ±1% for temperatures ranging from -55°C to +125°C for some capacitors, and from 0.01°C to +85°C for others. The capacitance stability is 0.5%/Yr and 0.2%/Yr respectively.
The Temperature Coefficient of a capacitor is the maximum change in its capacitance over a specified temperature range. The temperature coefficient of a capacitor is generally expressed linearly as parts per million per degree centigrade (PPM/ o C), or as a percent change over a particular range of temperatures.
If the surrounding temperature of the capacitor is more than the rated operating temperature, the capacitance of the capacitor can change significantly so it can impact the overall operation of the circuit. The normal working temperature for most practical capacitors is ranging between -30 °C and +125 °C.
What is the temperature characteristics of ceramic capacitors?
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