Introduction of Wet Tantalum Capacitors

2024-10-15

What is a Wet Tantalum Capacitor?

A type of military tantalum capacitors is wet tantalum capacitor. The basic structure of wet tantalum capacitors is mainly composed of an anode, anodized layer, electrolyte, conductive liquid, and cathode. The anode is a thin wire or foil mainly composed of gold and tantalum, which forms an insulating film on the surface of the anode through electrolytic oxidation - the anodic oxide layer, which is a key part of forming a capacitor. Electrolytes typically use high-purity acidic solutions to provide electrical conductivity and protect the anode. Conductive liquids are solutions with low viscosity and high conductivity, such as ammonium sulfate or potassium sulfate, which serve as one of the dielectrics of capacitors and together with the anodic oxide layer form the main body of the capacitor. The cathode is made of a mixture of various metals such as tin, lead, silver, etc., which forms a potential difference with the anode to form a capacitor. The performance characteristics of wet tantalum capacitors are unique, and wet tantalum capacitors stand out among many types of capacitors due to their distinctive performance features.

Wet tantalum capacitors play an indispensable role in the design and manufacturing of electronic devices as an important member of the electronic component field, with unique performance and wide range of application scenarios. Firstly, it has a high capacity of up to thousands of farads, suitable for application scenarios that require high capacity. Secondly, wet tantalum capacitors can withstand high voltages, making them widely used in high-voltage equipment. In addition, wet tantalum capacitors have stable performance, minimal changes, and high reliability during long-term operation, and work work normally in harsh environments.

Characteristics of Wet Tantalum Capacitors

Wet tantalum capacitor is a type of military tantalum capacitor that uses tantalum metal as the electrode material and is filled with a liquid medium (such as aqueous solution) inside.

It has the following characteristics:

1. High capacity: Capacity of wet tantalum capacitors can reach thousands of farads, suitable for applications with high capacity requirements.
2. High voltage: Withstand high voltages, making them widely used in high-voltage equipment.
3. Stability: Wet tantalum capacitors have little performance change during long-term operation and have good stability.
4. Miniaturization: Compared to other types of capacitors, wet tantalum capacitors have a smaller volume, which is conducive to the miniaturization of equipment.
5. Reliability: High reliability and can work normally in harsh environments.
6. Low self loss: Low self loss and can exhibit good performance in high-frequency applications.

Development trend of wet tantalum capacitors

As a type of high-performance capacitor, is mainly reflected in the following aspects:

1. Further improving the capacity and voltage bearing capacity of capacitors to meet higher performance application requirements;
2. Optimizing the structure and production process of capacitors, reduce production costs, and improve market competitiveness.
3. Strengthening research and development innovation, develop new wet tantalum capacitor products, and expand a wider range of application areas.

Hongda Capacitors Wet Tantalum Capacitors

The following are the main diagram (Figure 1) and sectional diagram (Figure 2) of the Hongda HCAK86 wet tantalum capacitor

https://www.hongdacapacitors.com/res/Tantalum-Hybrid-Capacitors/CAK86-Series-High-Frequency-Military-Wet-Tantalum-Capacitors.pdf

The Hongda HCAK86 wet tantalum capacitor adopts silver shell packaging, gas sealing, cylindrical shape, axial lead, external insulation sleeve, and polar capacitor. Excellent and stable electrical performance, high reliability, and long lifespan; It is a high-frequency product with low equivalent series resistance, high ripple current resistance, and small size. It follows the GJB733A-96 standard QJ/PWV230-2008.

Widely applicable to high-frequency circuits of military electronic equipment with reliability requirements in aerospace, such as aviation, weapons, electronics, ships, communications, and other fields.

Technical specifications: Operating temperature range: -55°C~125°C; Capacitor tolerance: K: ± 10%; M: ±20%; Room temperature leakage current: l_o≤0.0008C_R, U_R (µA) or 0.8 µA (whichever is greater) High temperature (85℃, 125℃) leakage current: l≤6 l_o

The following are the main diagram (Figure 3) and sectional diagram (Figure 4) of the Hongda HCA351 wet tantalum capacitor

https://www.hongdacapacitors.com/res/Tantalum-Hybrid-Capacitors/CA351-Series-Hermetically-Military-Wet%20Tantalum-Capacitors.pdf

The Hongda HCA351 wet tantalum capacitor adopts silver shell packaging, gas seal, cylindrical shape, axial discharge, sheath insulation sleeve, polar capacitor, with excellent electrical performance, stability and reliability, good resistance to harsh environments and storage performance, small size, wider rated voltage and nominal capacitance range, and the execution standard is QJ/PWV131-2002. DC or pulse circuits suitable for communication, instrumentation, and other electronic devices.

Technical specifications: Working temperature range: -55℃~125℃(when>85℃, apply category voltage). Capacitor tolerance: K: ±10%; M: ±20%

Room temperature DC leakage current: I₀≤0.0008CRUR (µ A) or 1 µA (maximum)

High temperature DC leakage current: I≤0.006CRUR, (µ A) (85℃, 125℃)

Military tantalum capacitors, this small 'superhero', play a crucial role in electronic products due to their unique performance characteristics and wide range of application scenarios, with their exceptional quality and outstanding performance. With the continuous advancement of electronic technology and the expansion of application fields, wet tantalum capacitors will usher in broader development prospects. In the future, we look forward to wet tantalum capacitors playing an important role in more fields, providing strong guarantees for the efficient and stable operation of electronic devices. Hongda Capacitors will also play an important role as a small "superhero" in more fields, bringing more convenience and possibilities to human life.