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1. Temperature and capacitor life.
In general, the lifetime of capacitors decreases with increasing temperature, most notably for electrolytic capacitors. An electrolytic capacitor with a limit operating temperature of 85°C, when working at a temperature of 20°C, can generally guarantee a normal working time of 181,019 hours; while working at a limit temperature of 85°C, the general condition can only guarantee 2000 hours of normal working time. So, when designing the circuit, should pay attention to this situation.
2. The loss tangent of temperature and capacitance.
Any capacitor has a loss tangent, which is the loss of the capacitor. In general, the tangent value increases with the increase of temperature. For example, the loss tangent value of CC10 ultra-high frequency ceramic capacitor is 0.0012 at normal temperature (20°C±5°C), but it is 0.0018 at positive limit temperature (85°C). It can be seen that the temperature is greatly affected.
3. Insulation resistance of temperature and capacitance.
Generally, the insulation resistance of capacitors decreases with the increase of temperature, and the decrease of insulation resistance will lead to the increase of leakage current of capacitors.
4. Temperature and capacitance.
The temperature coefficient of capacitance means that the capacity of the capacitor changes with temperature. When designing a precision capacitance timing circuit and an oscillation circuit whose frequency is determined by capacitance, the influence of temperature on capacitance should be fully considered, otherwise, the designed capacitance timing circuit will have inaccurate timing; the oscillation frequency of the oscillation circuit will vary with temperature. change with changes.