A CA502 axial wet tantalum capacitor produced by BEC is a half-hermetically sealed axial wet tantalum electrolytic capacitor with silver-coated packaging, polar axial leads and a wide operating temperature range of -55°C to +185°C, which is ideal for ultra-high- temperature and harsh industrial applications such as oil and gas exploration, complying with the QJ/PWV222-2008 standard. It stands out for its low leakage current, low dissipation factor, and long-term reliability. It features a silver case, glass seal, and polarity, offering high capacitance in a small package. It is widely used in oil and gas exploration and drilling equipment, as well as other high-temperature or resistant electronic equipment in the DC or pulse circuits.
Basic Parameters
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Product Category |
CA502 axial wet tantalum capacitor in 180℃ |
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Capacitance Range |
3.3UF~1000UF |
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Voltage Range |
6.3V~125V |
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Working Temperature |
-55℃~185℃ |
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Tolerance |
±10%, ±20%, -10%~+30% |
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Certificate |
RoHS, REACH |
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Applications |
Aerospace, military and avionics, oil and gas Exploration |
Characteristics
High-Grade Electrode Materials:
Anode: Sintered 99.99%+ ultra-high-purity tantalum powder formed into a high-density pellet, with a thick, uniform tantalum pentoxide (Ta2O5) dielectric film grown via precision anodization-engineered to remain stable and non-degrading at 185°C (thicker than CA501/CA82 for ultra-high-temperature stress).
Cathode: 185°C-optimized liquid electrolyte (proprietary organic/inorganic blend) with high ion conductivity at extreme temperatures; resists thermal breakdown and slow evaporation (matched to the half-seal design for long-term performance).
Stable Leakage Current (temperature-dependent): Defined as the greater value of the two criteria (CR = rated capacitance (μF), UR = rated voltage (V))-balanced for ultra-high-temperature operation:
25°C: I0≤0.002CRUR (μA) or 2 μA.
85°C: I0≤0.015CRUR (μA) or 15 μA.
185°C (max temp): I0≤0.04CRUR (μA) or 5 μA.
Excellent Storage Stability: Stored in original sealed anti-static packaging at 0°C~30°C, relative humidity ≤85% (dry/cool, no condensation/corrosive gases); 24-month shelf life with no pre-testing for short-term storage (<24 months); for long-term storage (>24 months), only a 25°C leakage current test is needed before use (capacitance/DF remain in spec).
Production Process
Parts of Our Production Facilities
FAQ
Q1: What are the CA502 capacitor's leakage current specifications?
A1: Leakage current (I0) is defined as the greater value of the two criteria (CR=rated capacitance (μF), UR = rated voltage (V)) and is stable across its extreme temperature range:
25°C (room temp): I0≤0.002CR*UR (μA) or 2μA.
85°C (mid-range): I0≤0.015CR*UR (μA) or 15μA.
185°C (max continuous temp): I0≤0.04CR*UR (μA) or 5μA.
Q2. What key materials are used in the CA50 capacitor's anode and cathode for 185°C operation?
A2: Its internal materials are 185°C-optimized to resist thermal degradation- the core of its ultra-high-temperature performance.
Anode: Sintered 99.99%+ ultra-high-purity, high-density tantalum powder formed into a porous pellet, with a thick, uniform tantalum pentoxide (Ta2O5) dielectric film grown via precision anodization. This film is thicker than CA501/CA82's to withstand the thermal stress of 185°C continuous operation.
Cathode: Proprietary organic/inorganic blend liquid electrolyte formulated for high ion conductivity at 185°C; it resists thermal breakdown and slow evaporation, matched to the CA502's half-seal design for long-term performance in non-corrosive environments.
Q3: What is the CA502 capacitor's operating temperature range, and when does voltage derating start?
A3: Continuous operating temperature: -55°C to +185°C; intermittent operation up to 200°C is allowed only with strict manufacturer-specified voltage derating.
Mandatory voltage derating: Starts at 155°C (same as CA501/CA82, unlike CA306's 85°C derating).
This proactive derating mitigates thermal stress on the dielectric film and electrolyte to prevent premature failure at ultra-high temperatures.
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