Conformal Coating Guide for Conformal Coated Tantalum Capacitors 6

The sum of the peak AC voltage and the applied DC voltage shall not exceed the voltage of the capacitor.diode

2.2 When the negative peak AC voltage plus the applied DC voltage does not allow the voltage to reverse beyond 10% of the DC operating voltage+25 ° C.diode

3. Reverse voltage: Solid tantalum capacitors are used to apply reverse voltage. However, they have been proven to have the ability to withstand instantaneous reverse voltage peaks reaching 10% of the DC rated value at 25 ° C and 5% DC, with a rated temperature of+85 ° C.diode

4. Temperature derating: If these capacitors operate at temperatures above+25 ° C, the allowable root mean square ripple current should be calculated using the derating factor shown in the figure: QQ image 20191225105046.pngdiode

5. Power consumption: The power consumption is affected by the heat sink capacity of the installation surface. Non sinusoidal ripple currents may produce different than those shown. It is important that the equivalent IRMS value determines the operational level when calculating the allowable value. The power consumption calculation uses a derating factor (see paragraph 4).

6. Attachment: 6.1 Welding: Capacitors can be welded using traditional welding techniques such as convection, infrared reflow soldering, and wave soldering hot plate methods. The welding profile shows typical recommended time/temperature conditions for welding. Suggest preheating to reduce thermal stress. The recommended maximum preheating rate is 2 ° C/s. Accessories with soldering iron are recommended for temperature and time at temperature due to their difficulty in control. Welding iron must never come into contact with capacitors.diode