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How to ensure the high temperature resistance of tantalum capacitors

The high temperature resistance of tantalum capacitors is mainly guaranteed by a process called "aging", which is a dynamic aging process in which different voltages are applied in stages under high temperature. The specific mechanism and steps are as follows:

• Principle of aging process
The aging process is to apply a DC voltage to the packaged tantalum capacitor, and gradually increase the temperature at the same time, so that the tantalum oxide film (dielectric) inside the capacitor continues to dynamically mature under the action of the electric field, and repairs the defects and flaws in the oxide film through the "self-healing" effect, thereby enhancing the high temperature resistance and overall reliability of the dielectric.

• Apply voltage by increasing the temperature in stages
This method includes multiple temperature stages, such as room temperature (2-5V constant voltage), 80-90℃, 120-130℃, 190-205℃, 225-230℃, and apply a corresponding proportion of the rated voltage (such as 0.45-1 times the rated voltage) in each stage and maintain it for a certain time (ranging from 1 hour to 24 hours), and finally cool it naturally and return to the temperature to apply pressure to ensure that the capacitor can still work stably at high temperatures.

• Significant effect
Through high-temperature segmented aging with different voltages, tantalum capacitors can work stably for a long time in a high-temperature environment of 230℃, greatly improving their service life and reliability, filling the gap in tantalum capacitor aging technology above 200℃.

• Technical significance
This process overcomes the problem of thermal breakdown failure of traditional tantalum capacitors due to high temperature, and is particularly suitable for electronic equipment in high-temperature and harsh environments, such as deep-water drilling platforms, aerospace and other fields, to avoid high maintenance costs due to capacitor failure.

In summary, the high-temperature resistance of tantalum capacitors is achieved through a precisely controlled high-temperature aging process. This process uses segmented heating and phased voltage application to continuously repair and strengthen the internal oxide film of the capacitor, thereby ensuring that it can still maintain stable performance and long life in an environment as high as 230℃.