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Tantalum Capacitors

Tantalum capacitors are discrete, non-polarized capacitors usually consisting of two tantalum powder rods pressed together into a solid block (which varies in shape from cylindrical to wedge-shaped). A layer of insulating material, which may be oil or a solid electrolyte, is eaten by the two poles to ensure insulation between them and provide the dielectric necessary for the capacitor to function. The ends of the rods or the outside of the block are usually covered with metal electrodes, typically aluminum, nickel-plated or bare tantalum.

When considering a tantalum capacitor, understanding the EIA code is important. These codes are the common way of describing the properties of a capacitor and selecting the appropriate cap. In this article, we will take a look at the EIA code specific to the 199D476X96R3D5B1 tantalum capacitor.

The 199D476X96R3D5B1 EIA Code:

• First Character: case size (D=7.3mm)
• Second Character: voltage rating (4=4volts)
• Third, Fourth and Fifth characters: capacitance value (76=7.6uF)
• Sixth Character: Capacitance tolerance (X=10%)
• Seventh Character: Temperature characteristics (R=R85°C)
• Eighth, Ninth and Tenth Characters: Manufacturer series (3D=D series)
• Eleventh Character: Manufacturer series, dielectric version (5=High-CV Version)
• Twelfth Character: Manufacturer\'s code (B=TDK)
• Thirteenth Character: Year code (1=2019)

Application Field and Working Principle:

Tantalum capacitors are particularly useful for applications that require high-temperature operation, high-frequency switching and high-efficiency power conversion. They are widely used in analog, power supply and audio circuits, as well as in computers, in medical equipment, in automotive electrical systems, in telecommunications, and in many other applications. The compact size of tantalum capacitors makes them attractive for applications where board space is limited.

Tantalum capacitors are a type of electrolytic capacitor that has a tantalum electrode in the form of a porous anode and an electrolyte filled with tantalum pentoxide. The working principle of a tantalum capacitor is that when an electric field is applied between the electrodes, the electrolyte is polarised and the positive ions move to the negative electrode while the negative ions move to the positive electrode to form the electric field. This polarisation forms an electric dipole in the electrolyte and the electric field increases the number of dipole moments in the electrolyte, thereby increasing the capacitance.

In addition, the porous structure of the anode allows for the flow of ions in the electrolyte, thus further increasing the capacitance. The electrochemical reactions of the anode and the electrolyte also affect the capacitance. These electrochemical changes allow for the storage of electrical energy in the form of a capacitance in the tantalum capacitor.

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