T491B105K035AH

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T491B105K035AH is an encapsulated tantalum capacitor with 10μF capacitance, 35V voltage and rated ±10% temperature coefficient, which is widely applied in many electronic circuits. In this article, we will discuss the application field and working principle of T491B105K035AH.

Tantalum capacitors are one type of electrolytic capacitor made from tantalum powder, which is the second most abundant of transition metal family, and two types of electrodes, anode and cathode. The anode is made from sintered tantalum powder, while the electrolyte, typically an aqueous solution containing an electrolyte salt, pervades through the pores of the anode. The cathode consists of a solid oxide film deposited on the tantalum and it provides the potential difference required to facilitate the electrolyte flow and charge transfer. The capacitor takes its name from the tantalum component and it has become increasingly popular because of its reliable combination of high capacitance and small size.

T491B105K035AH is encapsulated tantalum capacitor with high volumetric efficiency and electrical stability, making it popular in various high reliability applications, such as military, aerospace, and defence projects. It is also used in other applications such as telecommunication and medical monitoring. Moreover, it plays an essential role in automotive, computing, instrumentation and power regulating circuits, as well as audio and video equipment.

The working principle of T491B105K035AH, as any other tantalum capacitor，can be explained with the capacitor’s equivalent circuit model as shown in Figure 1. The anode composes of a conductive part and a dielectric part, which includes the porous anode and electrolyte inside. As the capacitor is charged, the current ionizes the electrolyte molecules, forming ions and generating a thin dielectric layer on the anode grain boundaries. As the voltage increases, the dielectric layers becomes thicker, forming a high dielectric constant electrolyte insulator between the anode and the cathode. As a result, an electrical field forms between the anode and the cathode, enabling the capacitor to store electrical energy.

The T491B105K035AH is also known for its high ripple current and low equivalent series resistance due to its reverse structure. In manufacturing, a tantalum protective layer consists of an oxide layer and a thin film on the anode material to protect it from inefficient anodic current flow. The anode layer protects against the material dissolution, while the layer on the protective layer can further reduce the temperature coefficient of the capacitor. Consequently, T491B105K035AH has very low equivalent series resistance, which dramatically reduces the power loss as compared to other capacitors.

In conclusion, T491B105K035AH is a type of tantalum capacitor with 10μF capacitance and 35V voltage, and is primarily used in military, aerospace, telecommunication, medical and other high reliability applications, because of its volumetric efficiency and electrical stability. Furthermore, its high ripple current and low equivalent series resistance make it very attractive in power regulation and other DC Power applications.

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