Solid tantalum capacitor with extremely low ESR value and leading-out welding sheet at gold plating end

Abstract

The invention discloses a solid tantalum capacitor with an extremely low ESR value and a leading-out welding sheet at a gold plating end. The solid tantalum capacitor comprises a tantalum core and a tantalum wire, wherein an epoxy resin encapsulation layer wraps the tantalum core, a positive electrode gold plating cap and a negative electrode gold plating cap are respectively arranged at two endsof the encapsulation layer, the negative electrode gold plating cap is arranged at an opening end of the encapsulation layer, and the negative electrode gold plating cap and the tantalum core are connected by a surface welding mode. Spot welding between an existing wire and the tantalum wire is changed to contact surface welding, and the ESR value of the tantalum capacitor can be effectively reduced by large-area welding; and moreover, existing positive / negative pole plate tin plating is changed to gold plating cap leading out, the conductivity of a welding position can be greatly improved, and the contact resistance of the tantalum capacitor on a circuit board also can be greatly reduced.

Description

technical field [0001] The invention relates to a tantalum capacitor, in particular to a solid tantalum capacitor with an extremely low ESR value and a gold-plated terminal leading out solder tabs. Background technique [0002] Solid tantalum capacitor is a solid capacitor made of metal tantalum without electrolyte. Because it uses metal tantalum as the medium, it can adapt to high temperature working environment, and the tantalum capacitor has automatic repair or isolation oxide film during operation. The performance of the defects in the oxide film enables the oxide film medium to be strengthened and restore its proper insulation ability at any time without being continuously and cumulatively damaged. This unique self-healing performance ensures its long life and reliability. , Tantalum capacitors have a very high working electric field strength, and have the characteristics of excellent performance and small size. Therefore, tantalum capacitors have been developed rapidly...

AI Technical Summary

Problems solved by technology

[0003] The ESR value is "equivalent series resistance value". In most mobile wireless products, capacitors with low ESR often have better performance than capacitors with high ESR, and have higher requirements on the bulk resistance of the capacitor itself. The positive and negative poles of the solid tantalum capacitor are connected to the tantalum wire through metal wires, the positive and negative electrodes are tinned metal sheets, and the wires and tantalum wire are connected by spot welding. This connection method makes the contact resistance of the welding place larger. That is, the ESR value is large, thereby reducing the electrical performance of tantalum capacitors

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