DLA 13008 Guide for Conformal Coated Tantalum Capacitors 5

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. The rated temperature is+85 ° C. 4. Temperature derating: If these capacitors operate at temperatures higher than+25 ° C, the allowable root mean square ripple current should be calculated using the derating factor shown in the figure. 5. Power consumption: Power consumption is affected by the heat sink capacity of the installation surface. Non sinusoidal ripple currents can generate currents that are different from 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).diode

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. 7. Recommended installation pad geometry: The nib must have sufficient clearance to avoid electrical faults and contact with other components. The size indicated by the width is the same as the maximum value. The width of the capacitor. This is to minimize lateral movement as much as possible. 8. Post weld cleaning (removal of flux): Tantalum capacitors are compatible with all commonly used solvents such as TES, TMS, Prelete, chloroethane, terpenes, and water cleaning media. However, CFC/ODS products are not recommended for the production of these devices. Solvents containing methylene should avoid using chlorides or other epoxy solvents as they can damage the encapsulation material of the epoxy resin.diode