1.Introduction:

Tantalum is dark, dense, ductile, very hard, easily fabricated, and highly conductive of heat and electricity. The

metal is renowned for its resistance ,as the metal powder, is in the production of electronic components, mainly

capacitors and some high-power resistors. Tantalum electrolytic capacitors exploit the tendency of tantalum to

form a protective oxide surface layer, using tantalum powder, pressed into a pellet shape, as one "plate" of the

capacitor, the oxide as the dielectric, and an electrolytic solution or conductive solid as the other "plate". Because

the dielectric layer can be very thin (thinner than the similar layer in, for instance, an aluminium electrolytic capacitor),

a high capacitance can be achieved in a small volume. Because of the size and weight advantages, tantalum

capacitors are attractive for portable telephones, personal computers, and automotive electronics.

2.GB 14841 as follows:

3.Tolerance

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