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| ST110 Wet Tantalum Capacitors |
Overview
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.