TA Capacitors With Conductive Polymer Robust to Lead Free Process
Written By: Z. Sita | M. Biler
Abstract:
Tantalum capacitors with conductive polymer cathodes have found a place in the market as a low ESR component with reduced ignition. Conductive polymer cathodes however, suffer from instability during multiple high temperature thermal treatments such as lead free soldering due to its limited self healing ability and lower thermal and mechanical strength compared with manganese dioxide. This makes capacitors with conductive polymer cathode more sensitive to thermo-mechanical stresses, which appear during soldering and to negative influences of storage condition after removal from the protective packaging prior to soldering. This paper describes methods of improving the robustness of such capacitors with lead free processes without a negative impact on ESR. Presented procedures enhance the stability and reliability of Tantalum capacitors with conductive polymer cathodes making them comparable to capacitors containing a manganese dioxide counter electrode system.
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Tantalum capacitors with conductive polymer cathodes have found a place in the market as a low ESR component with reduced ignition. Conductive polymer cathodes however, suffer from instability during multiple high temperature thermal treatments such as lead free soldering due to its limited self healing ability and lower thermal and mechanical strength compared with manganese dioxide. This makes capacitors with conductive polymer cathode more sensitive to thermo-mechanical stresses, which appear during soldering and to negative influences of storage condition after removal from the protective packaging prior to soldering. This paper describes methods of improving the robustness of such capacitors with lead free processes without a negative impact on ESR. Presented procedures enhance the stability and reliability of Tantalum capacitors with conductive polymer cathodes making them comparable to capacitors containing a manganese dioxide counter electrode system.
