Note: The environment in which the product is used and the environment in which it is assembled should be used within the range of the rated performance of the capacitor specified in the catalog and the acknowledgement.
Polarity: Aluminium electrolytic capacitors have polarity. Please do not load reverse voltage or AC voltage. If the polarity is opposite when installed, it may cause the circuit to be short-circuited in the initial state, resulting in the failure of the aluminium electrolytic capacitor safety explosion-proof valve, etc. When electrolytic capacitors are used in circuits with alternating polarity, please choose a bipolar product, but bipolar products cannot be used in AC circuits.
Voltage: Please do not load the product with the voltage exceeding the rated voltage. The rated voltage is marked on the product. Please also control the peak value of the ripple voltage superimposed with the DC voltage below the rated voltage. Although the surge voltage exceeding the rated voltage is specified, However, there are restrictions and cannot be guaranteed for a long time.
Ripple current: Please do not load current exceeding the rated ripple current. When excessive ripple current is applied, internal heat will be generated, life will be shortened, safety explosion-proof valve will operate, short-circuit fault and failure will occur, and rated ripple current will occur. The frequency is limited. When used at a frequency other than the specified frequency, it is controlled to be multiplied by the value of the frequency correction coefficient specified in each series. The aluminium electrolytic capacitor ages due to self-heating and temperature rise when the ripple current is superimposed. Reduce the life of 10 °C per liter by half (reference value). To maintain the long life of the product, reduce the ripple current when designing the circuit.
Operating temperature: Do not use at a temperature exceeding the upper limit of the working temperature. If it is used in a temperature exceeding the upper limit of the working temperature, the life of the capacitor will be shortened, resulting in failure of the safety explosion-proof valve.
Life time: When designing a circuit, it is necessary to select a capacitor that matches the life of the product. The result calculated by using the calculated life formula is not a guaranteed value. When designing the life of the product, please select a capacitor with sufficient margin relative to the estimated value. If the result calculated by the estimated life formula is more than 15 years, the upper limit is 15 years.
Charging and discharging: Do not use a general-purpose capacitor in a circuit that is rapidly charged and discharged. If it is used in a charging/discharging circuit with a large voltage difference or in a circuit with a short cycle and repeated rapid charging and discharging, it may cause a decrease in electrostatic capacitance and internal heating. In such a circuit, it is necessary to select a rapid charge and discharge product that meets the conditions of charge and discharge cycle, number of charge and discharge, discharge resistance, and use temperature.
Failure mode: Aluminium electrolytic capacitors are components with a service life. Under normal circumstances, an open-circuit end-of-life mode will occur. When the product and the operating conditions are different, the safety explosion-proof valve will be triggered.
Casing of capacitor: The outer casing of aluminium electrolytic capacitor does not guarantee insulation. When the insulation of capacitor casing is not guaranteed, please do not use where there is specific requirement for insulation performance. At the same time, the characteristics of PET casing are heat-resistant and environmentally friendly. However, its water and water vapor have the characteristics of bloating, and it will be like a lantern (drum), blasting and wrinkling.
Capacitor insulation: The outer casing, the negative terminal, and the positive terminal of the aluminium electrolytic capacitor are completely isolated from the circuit on the circuit board. When the aluminium electrolytic capacitor contacts other potentials, the safety explosion-proof valve may appear.
Use environment: Please do not use aluminium electrolytic capacitors in the following environments, such as direct contact with water, salt water and oil, or condensation environment, direct sunlight, and environment full of harmful gases (sulfide, H2SO3, HNO3, CL2) , ammonia, etc.), The environment of ultraviolet light and effective radioactive materials, vibration and shock conditions exceed the harsh environment of the scope of the sample and the acknowledgment.
Capacitor configuration: Aluminium electrolytic capacitors use a conductive electrolyte with flammable organic solvent as the main solvent and flammable electrolytic paper. When the electrolyte leaks out onto the printed circuit board, it will corrode the circuit board, resulting in a circuit board. Short circuit, even smoke, fire, etc., so please confirm the following design: ① Align the terminal spacing of the capacitor with the hole spacing of the printed wiring board. ② For the top of the explosion-proof valve of the capacitor, please leave the following space:
| 产品尺寸(ΦD) | 6.3~16 | 18~35 | ≥40 |
| 空间间隔(mm) | ＞2 | ＞3 | ＞5 |
Note: Do not extend the wiring or circuit above the explosion-proof valve of the capacitor. If the explosion-proof valve part of the capacitor contacts the edge of the printed wiring board, set the vent hole of the explosion-proof valve according to the position of the explosion-proof valve, not in the sealing part of the capacitor. Next, perform circuit wiring. If there is wiring near the capacitor, check that the line spacing is 2 mm or more. Do not place hot parts on the periphery of the capacitor and on the back side of the printed wiring board (below the capacitor). When installing capacitors on the printed wiring board on both sides When designing, pay attention to the fact that there are no unnecessary substrate holes or connection through holes under the capacitor. When a capacitor is mounted on the printed circuit board on both sides, there is no wiring line at the mounting portion of the capacitor body.
Others: As the temperature, frequency and application life change, the electrical characteristics of the capacitor will change. Please design the circuit after confirming the change: ① When the two capacitors are connected in parallel, please consider the current balance in the circuit design. ② When two capacitors are connected in series, the voltage balance should be considered, and a voltage dividing resistor connected in parallel with the capacitor can be inserted.
