A CAK31 axial wet tantalum capacitor produced by BEC is a high reliable, hermetically sealed capacitor by using tantalum pentoxide dielectric as anode. It meets Chinese military-grade hermetically sealed axial wet tantalum electrolytic capacitor with silver case, wet electrolyte, high reliability and GJB compliant. It's equivalent to US MIL-PRF-39006/9D CLR65. It's widely used in harsh-environment like aerospace, military and telecom DC/pulsed circuits for long term applications.
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CAK31 axial wet tantalum capacitor |
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1.7UF~1200UF |
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6V~125V |
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-55℃~125℃ |
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±10%, ±20% |
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CAK31 axial wet tantalum capacitors are hermetically sealed and silver-cased components with axial polars and wet electrolyte, featuring wide temperature range, low leakage and high reliability. They are compliant with Chinese military standards and ideal for the use in harsh environment like military, aerospace and telecom applications.
A unique and critical feature. Most CA30 capacitors are rated to withstand a limited reverse voltage (typically 1.0 to 3.0V DC, specified in the datasheet) without damage. This is impossible for solid tantalums.
tight leakage limits ensure minimum self-discharge for precision energy storage and filtering. Wet electrolyte resists thermal and voltage stress. Low dissipation factor maintains capacitance consistency across temperature/voltage swings.
Self-Healing Ability: Minor dielectric flaws are "burned away" by the electrolyte, preventing latent failures-a major reliability advantage.
Q1: What makes CAK31 axial wet tantalum capacitors suitable for harsh environment applications?
A1: Three core design features enable the parts adapt to harsh environment.
1. Hermetic silver case sealing. In this case electrolyte leakage and ingress of moisture, dust, and corrosive gases can be greatly prevented.
2. Wide temperature tolerance. They can be stably operated in extreme low and high temperature environments (-55℃ ~ +125℃).
3. Low-temperature impedance. Impedance is limited to specified values at -55℃ to avoid performance degradation in ultra-low temperatures.
Q2: What are the DC leakage current specifications for CAK31 axial wet tantalum capacitors?
A2: Leakage current is strictly limited (temperature-dependent, whichever value is greater applies) and complies with GJB733A-96:
At +20℃ (room temp): I₀<= 0.0008CR*VR (C=capacitance, RVR=rated voltage) or 1μA.
At +85℃ / +125℃ (high temp): I₀<= 0.006CR*VR or 6μA.
Q3: What is the CAK31's case material, and what is its purpose?
A3: The CAK31 is a cylindrical silver case housed with a heat-shrink insulation sleeve. The silver case serves three critical functions:
Ensures 100% hermetic sealing (prevents electrolyte leakage and environmental ingress).
Provides excellent thermal conductivity (dissipates heat from the capacitor core to the PCB/circuit housing).
Resists corrosion (suitable for harsh environments like marine/salt spray conditions).
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