A CAK39 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-39006/25 and CLR681. It's widely used in aerospace, aviation, military, communication and other mission-critical applications requiring high ripple current and long-term stability
Basic Parameters
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Product Category |
CAK39 axial wet tantalum capacitor |
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Capacitance Range |
6.8UF~2200UF |
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Voltage Range |
6V~125V |
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Working Temperature |
-55℃~125℃ |
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Tolerance |
±10%, ±20% |
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Certificate |
RoHS, REACH |
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Applications |
Aerospace, military systems, medical equipment, energy applications, telecommunications, defense areas |
Characteristics
CAK39 axial wet tantalum capacitors are hermetically sealed and it features glass-to-tantalum hermetic sealing, high ripple current handling, low ESR and no thermal runaway risk, tailored for harsh-environment high-reliability DC/pulsed circuits in aerospace, aviation, and military systems.
This series are featured by all-tantalum hermetic construction: Cylindrical tantalum case with glass-to-tantalum hermetic sealing (100% airtight), insulation sleeve, axial polar leads for through-hole mounting. and clear polarity marking ( a "+" symbol shown on sleeve) to prevent reverse installation.
High ripple current handling and no thermal runaway risk: 700mA~2300mA ripple current capacity, suitable for power supply and pulsed load applications. Wet electrolyte design can better avoid thermal runaway. It's a critical advantage in mission-critical systems.
Reverse Voltage Tolerance: 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 hard to realize for solid tantalum capacitors.
Production Process
Parts of Our Production Facilities
FAQ
Q1: What are the most common causes of CAK39 axial wet tantalum capacitor failure?
A1: Nearly all failures are installation or operation mistakes. The component itself has an ultra-low failure rate per GJB733A-96. The main causes are mainly from the following:
Exceeding ripple current rating. Operating beyond 700mA~2300mA causes overheating and electrolyte degradation.
Reverse polarity installation: Even with 3V reverse tolerance, intentional or accidental full reverse voltage causes immediate leakage and seal damage.
Improper soldering: Overheating (≥350°C) or long soldering time (>5s) damages the glass-to-tantalum hermetic seal and volatilizes electrolyte.
Over voltage or inrush current: Exceeding rated DC voltage or unregulated inrush current causes dielectric breakdown.
Mechanical damage: Bending leads too close to the case (cracks the seal) or physical shock or vibration.
Q2: Does CAK39 axial wet tantalum capacitor have a thermal runaway risk?
A2: Not likely. the CAK39 uses a wet electrolyte which eliminates the thermal runaway risk. If the CAK39 experiences overvoltage/ overcurrent, the wet electrolyte dissipates heat safely instead of igniting, making it a critical choice for mission-critical systems where component failure cannot be tolerated.
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