Molded Guide

www.vishay.com

Vishay Polytech

Revision: 11-Apr-16

2

Document Number: 40218

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

SOLID ELECTROLYTE TANTALUM CAPACITORS

Solid electrolyte capacitors contain manganese dioxide,

which is formed on the tantalum pentoxide dielectric layer

by impregnating the pellet with a solution of manganous

nitrate. The pellet is then heated in an oven, and the

manganous nitrate is converted to manganese dioxide.

The pellet is next coated with graphite, followed by a layer

of metallic silver, which provides a conductive surface

between the pellet and the leadframe.

Molded chip tantalum capacitor encases the element in

plastic resins, such as epoxy materials. After assembly, the

capacitors are tested and inspected to assure long life and

reliability. It offers excellent reliability and high stability for

consumer and commercial electronics with the added

feature of low cost.

Surface mount designs of “Solid Tantalum” capacitors use

lead frames as shown in the accompanying drawings.

TANTALUM CAPACITORS FOR ALL DESIGN

CONSIDERATIONS

Solid electrolyte designs are the least expensive for a given

rating and are used in many applications where their very

small size for a given unit of capacitance is of importance.

Also important are their good low temperature performance

characteristics and freedom from corrosive electrolytes.

Datasheets covering the various types and styles of

capacitors for consumer and entertainment electronics and

industry

applications

are

available

where

detailed

performance characteristics must be specified.

MOLDED CHIP CAPACITOR, ALL TYPES EXCEPT TMCTX / TMCJ / NMC

MOLDED CHIP CAPACITOR WITH BUILT-IN FUSE, TYPE TMCTX

MOLDED CHIP CAPACITOR 0603 SIZE, TYPE TMCJ

Sintered tantalum

MnO

2

Carbon / silver coating

Epoxy encapsulation

Tantalum wire

Supporter

Silver adhesive

Solderable cathode termination

Solderable anode termination

Leadframe

Tantalum wire

Epoxy encapsulation

Leadframe

Solderable anode termination

Solderable cathode termination

Fusible ribbon

Carbon / silver coating

Sintered tantalum

Supporter

Silver adhesive

MnO

2

Epoxy encapsulation

Solderable anode termination

Solderable cathode termination

Leadframe

Silver adhesive

Sintered tantalum

MnO

2

Carbon / silver coating

Tantalum wire