Surface mount aluminum electrolytic capacitors have evolved from DC to AC, from low temperature to high temperature, from low voltage to high voltage, and from universal to special types to meet demand. What exactly is temperature change rate?

Temperature change rate, also known as "temperature change rate". Refers to the temperature change value per unit length in any direction along an object. For a scalar. The commonly used mathematical symbol "t/x" represents the unit of "℃/m". Its mathematical definition is: where Δ x is the distance (m) between the isothermal surface t+Δ t and the isothermal surface t in a certain x direction; Δ t is the temperature difference between the two (℃).

The lifespan of surface mount electrolytic capacitors is related to temperature, and the lifespan of surface mount electrolytic capacitors will decrease under high ambient temperature conditions. Generally speaking, the failure principle of surface mount electrolytic capacitors is believed to be caused by the gradual evaporation of electrolyte through rubber plugs. However, as the temperature increases, the electrolyte inside the surface mount electrolytic capacitor slowly turns into steam and evaporates bit by bit. So the capacity of the surface mount aluminum electrolytic capacitor will also change, and we can see the relationship between the capacity of that surface mount aluminum electrolytic capacitor and temperature through a formula. The expression for the rate of change in capacitance Δ C is Δ C=C2-C1/C1 × 100%. In the formula, C1 represents the capacitance at room temperature (20 ± 5) ℃; C2 is the capacitance at temperatures of -25 ℃, -55 ℃, or (+85 ± 5) ℃. The temperature change rate can reveal the capacity variation pattern of surface mount aluminum electrolytic capacitors, as well as their lifespan.