Polymer Guide

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Revision: 08-Sep-2022

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Document Number: 40076

For technical questions, contact: polytech@vishay.com

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SOLID ELECTROLYTE POLYMER TANTALUM CAPACITORS

Solid electrolyte polymer capacitors utilize sintered tantalum pellets as anodes. Tantalum pentoxide dielectric layer is formed

on the entire surface of anode, which is further impregnated with highly conductive polymer as cathode system.

The conductive polymer layer is then coated with graphite, followed by a layer of metallic silver, which provides a conductive

surface between the capacitor element and the outer termination (lead frame or other).

Molded chip polymer tantalum capacitor encases the element in plastic resins, such as epoxy materials. The molding

compound has been selected to meet the requirements of UL 94 V-0 and outgassing requirements of ASTM E-595. After

assembly, the capacitors are tested and inspected to assure long life and reliability. It offers excellent reliability and high stability

for variety of applications in electronic devices. Usage of conductive polymer cathode system provides very low equivalent

series resistance (ESR), which makes the capacitors particularly suitable for high frequency applications.

TANTALUM CAPACITOR WITH POLYMER CATHODE TYPE T50 / T51 / T55 / T56

TANTALUM CAPACITOR WITH POLYMER CATHODE TYPE T58

Silver adhesive

Solderable cathode termination

Polymer / carbon / silver coating

Sintered tantalum pellet

Epoxy encapsulation

Lead frame welded to Ta wire

Anode polarity bar

Solderable anode termination

Anode polarity bar

Side anode termination (+)

Side cathode termination (-)

Encapsulation

Sintered tantalum pellet

Polymer / carbon / silver coating

Glass reinforced epoxy resin substrate

Bottom cathode termination (-)

Silver adhesive epoxy

Conductive strip

Rating / marking

Bottom anode termination (+)

Copper pad

Anode wire