Vishay ST110 Wet Tantalum Capacitors


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Wet Tantalum Capacitors
ST110 Wet Tantalum Capacitors 


By definition, a wet tantalum capacitor by Vishay Sprague is a hermetically sealed capacitor made of a pellet of sintered tantalum metal as an anode and surrounded by a liquid electrolyte as a cathode. Often called wet slug tantalum capacitors, it has several advantages over aluminum electrolytic, solid tantalum, and ceramic capacitors. Like with all other capacitors, these advantages lead to a specific ‘sweet spot’ or dedicated area of applications where the wet tantalum capacitor is the best and preferred choice. These wet tantalum capacitors are manufactured to withstand hazardous environments which is paramount. The Vishay ST110 Wet Tantalum Capacitors offer 110µF capacitance, a 75VDC voltage rating, and 1.3Ω equivalent series resistance (ESR). The series operates over a -55°C to +125°C operating temperature range and is suitable for defense and aerospace applications.

Product Description

ST110 exhibits a self-healing mechanism from a chemical process that reestablishes the oxide layer dielectric when it is weakened. These capacitors have gotten on average three times the capacitance by volume than aluminum types owing to the higher dielectric constant and dielectric strength. This wet slug tantalum capacitor has a maximum operating temperature of 125 °C and a leakage current is 2 μA. Additionally, it can withstand a voltage of 75 VDC with a capacitance value of110uF and a tolerance of 20%.

The ST wet tantalum capacitors are passive devices that provide capacitive reactance to electrical circuits. These capacitors are electrolytic with a wet electrolyte, an anode, and a cathode. Due primarily to its superior characteristics including volumetric efficiency, high reliability, electrical stability over a wide temperature range, and long service life, ST wet tantalum capacitors are used over other capacitor types. These wet tantalum capacitors are best suited for applications such as military, aerospace, satellites, and heavy industrial fields.

Due to high dielectric strength, wet tantalum capacitors allow being built by very thin layers of tantalum pentoxide which are deposited directly on the capacitor’s electrodes. This process is much more efficient compared to the foil and separator construction found in aluminum electrolytic capacitors. Moreover, wet tantalum capacitors have the lowest leakage current as compared to all electrolytic capacitors. Leakage current is a parasitic current drawn by the capacitor when voltage exists. 

Wet tantalum capacitors are in the upper-cost range of electrolytic capacitors. Tantalum capacitors are more expensive than aluminum. Additionally, wet tantalum is more expensive than solid tantalum, and both are not used in everyday life consumer products. 

For more info, click Datasheets.

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