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Extra resources for 17.Dielectrics and Electrical Insulation
R1 Figure 20. Apparent RC ladder network equivalent circuit of the tantalum capacitor. R2 tc1 = C1 × R1 tc2 = C2 × (R1 + R2) tcn = Cn × (R1 + R2... 1 +125°C Figure 21. Equivalent series resistance for low ESR and standard tantalum capacitors as a function of frequency. 1 Frequency (MHz) 1 10 ESR, milliohms, maximum at 100 kHz 600 500 500 400 300 200 100 100 0 Figure 22. Equivalent series resistance decrease in the evolution of tantalum capacitor technology (KEMET data) T491 65 50 T494 T495 T495, SPEC Kemet series designation 30 T510 CAPACITOR INSULATION EIA defined ESR limit of 500 m⍀.
The clearing energy is directly related to the thickness of the metallization layer which in turn affects the electric stress which can be applied. The metallurgy has changed from aluminum to zinc to a new generation of alloy. Zinc has a lower clearing energy than aluminum but does not have the same corrosion resistance to humidity. The newest generation of alloys has both a low clearing energy and high corrosion resistance to humidity. Another area involving a large change has been the introduction of segmented patterns which provide the basis for dry, self-protected capacitors.
Cathode plate connected in the tantalum capacitor package to an external contact via a coating of carbon and then silver as a final coat. not make any sense to build smaller case sizes with smaller capacitances, because capacitance is a secondary consideration in this application. ESR is the primary concern. These devices are all life tested and surge tested. They have been put on extended surge testing from 0 Vdc to rated Vdc and back through millions of pulses with no failures. Extended ac current testing has shown that the heat buildup within the part is proportional to the ESR, and because the ESR is so much lower, there is little additional heat developed internally.