Electronic designs for military, aerospace, and medical equipment often require the highest levels of reliability and safety. This is especially important in the application of Tantalum (Ta) capacitors where the typical short circuit failure mode can lead to significant damage to the adjacent circuit board. (Part 1 of 2)
Rubber sealing materials play an important role in aluminium electrolytic capacitors, especially at high voltages and high temperatures. These materials must have outstanding temperature resistance; optimum hardness and mechanical strength for long lasting sealing results; excellent electrical insulating properties; and chemical compatibility with organic solvents and the electrolytes.
Failure due to board flex cracks persists as the dominant failure mode in multi-layer ceramic capacitors (MLCC). Board flex-crack failures are sometimes detected at in-circuit test or at functional test; but in a more critical point, they may be found in the field by the end customer
KEMET Electronics Corp has implemented several process and material improvements in order to improve the surface mount (SMT) performance of low ESR conductive polymer (KO-CAP) capacitors.
A misunderstanding of the failure mechanism of tantalum capacitors has created the fear of using these capacitors in high current applications. A capacitor depends on the dielectric as an insulative material and the plates as a conductive material.